Grey Mackerel – Queensland East Coast Inshore Fin Fish Fishery

Assessment Summary

Grey Mackerel

 

Unit of Assessment

Product Name: Grey Mackerel

Species:  Scomberomorus semifasciatus

Stock: Grey Mackerel – North east Queensland, Grey Mackerel – South east Queensland

Gear type: Mesh net

Fishery: Queensland East Coast Inshore Fin Fish Fishery

Year of Assessment: 2017

Fishery Overview

The Queensland East Coast Inshore Fin Fish Fishery (ECIFFF) is a geographically widespread, multi-species, multi-gear fishery ranging from the Qld/NSW border to the tip of Cape York (Figure 1).  The ECIFFF comprises commercial, recreational, charter and Indigenous sectors.  The commercial sector is Queensland’s fourth most valuable commercial fishery (based on estimated GVP), targeting a number of finfish species, using a variety of different net fishing methods. Some species are also taken commercially by hook and line. 


Figure 1: Queensland net fishing areas.  (Source: DAFF, 2014a)

The management arrangements governing the commercial sector are a complex array of limited entry (via the allocation of fishery symbols), restrictions on gear type (e.g. mesh sizes, net length), spatial closures under both fisheries and marine parks (State and Commonwealth) legislation and temporal restrictions (e.g. closed season on Barramundi, weekend closures).  Competitive total allowable catches (TACs) have also been established for some species (e.g. Tailor, Spotted Mackerel, sharks, Grey Mackerel).

The fishery is subject to intense competition for resources with the recreational sector who dominate the catches of most ‘bread and butter’ species, such as Tailor, Yellowfin Bream and Dusky Flathead.

The fishery has recently been subject to a $10m license buyout aimed at removing fishery symbols capable of using large mesh nets. 

More detailed summaries of the fishery are provided in DAFF (2014a) and at https://www.daf.qld.gov.au/fisheries/monitoring-our-fisheries/data-reports/sustainability-reporting/queensland-fisheries-summary/east-coast-inshore-fin-fish-fishery 

Two  separate ‘units of assessment’ are examined in this report:

  • Grey Mackerel (North East Queensland stock) taken with mesh nets in the ECIFFF
  • Grey Mackerel (South East Queensland stock) taken with mesh nets in the ECIFFF


Figure 2 Trends in Total Catch of Grey Mackerel (NEQ and SEQ)

Risk Scores

Performance Indicator

Grey Mackerel – NEQ

Grey Mackerel – SEQ

C1 TARGET SPECIES

MEDIUM

MEDIUM

1A: Stock Status

LOW

MEDIUM

1B: Harvest Strategy

PRECAUTIONARY HIGH

PRECAUTIONARY HIGH

1C: Information and Assessment

LOW

LOW

C2 ENVIRONMENTAL IMPACT OF FISHING

HIGH

HIGH

2A: Non-target Species

PRECAUTIONARY HIGH

PRECAUTIONARY HIGH

2B: ETP Species

HIGH

HIGH

2C: Habitats

LOW

LOW

2D: Ecosystems

LOW

LOW

C3 MANAGEMENT

MEDIUM

MEDIUM

3A: Governance and Policy

LOW

LOW

3B: Fishery-specific Management System

MEDIUM

MEDIUM

Summary of main issues

  • There are no well-defined harvest control rules in place to reduce exploitation as the point of recruitment impairment is approached for any of the assessed target stocks;
  • There is no independent monitoring of catch composition including discards;
  • The ECIFFF has the potential to interact with a large number of ETP species. At present, there is no mechanism to independently validate Species of Conservation Interest (SOCI) logbook reporting.  Uncertainties exist in the rates of interaction with some ETP species (e.g. inshore dolphins, Sawfish, protected sharks). 
  • The fishery appears well-placed against habitat and ecosystem PIs.

Outlook

Grey Mackerel – NEQ stock – Mesh net

Component Outlook Comments
Target fish stocks Improving A harvest strategy with well-defined harvest control rules will be developed by 2018 as part of the Queensland Government’s Queensland Sustainable Fisheries Strategy 2017-2027.
Environmental impact of fishing Improving Improvement in risk scoring is likely through the implementation of the Queensland Government’s commitment to introduce harvest strategies with well-defined harvest control rules for inshore fisheries by 2018, together with improved data collection, independent validation of commercial fisher logbooks and regular ecological risk assessments.  
Management system Improving A range of improvements to the management system are proposed as part of the Queensland Sustainable Fisheries Strategy 2017-2027, including strengthened stakeholder engagement, measures to strengthen compliance and measures to evaluate the performance of the management system (e.g. through monitoring against harvest strategies).     

 

Grey Mackerel – SEQ – Mesh net

Component Outlook Comments
Target fish stocks Improving A harvest strategy with well-defined harvest control rules will be developed by 2018 as part of the Queensland Government’s Queensland Sustainable Fisheries Strategy 2017-2027.
Environmental impact of fishing Improving Improvement in risk scoring is likely through the implementation of the Queensland Government’s commitment to introduce harvest strategies with well-defined harvest control rules for inshore fisheries by 2018, together with improved data collection, independent validation of commercial fisher logbooks and regular ecological risk assessments.  
Management system Improving A range of improvements to the management system are proposed as part of the Queensland Sustainable Fisheries Strategy 2017-2027, including strengthened stakeholder engagement, measures to strengthen compliance and measures to evaluate the performance of the management system (e.g. through monitoring against harvest strategies).     

 

Assessment Results

COMPONENT 1: Target species

1A: Stock Status

CRITERIA: (i)The stock is at a level which maintains high productivity and has a low probability of recruitment overfishing

(a) Stock Status – Grey Mackerel – NEQ stock

LOW RISK

Helmke et al (2016) report that there are at least five Grey Mackerel biological stocks across northern Australia, with a possible additional stock in the north-east Gulf of Carpentaria.  On the Queensland east coast, two stocks exist – a north east Queensland (NEQ) stock and a south east Queensland (SEQ) stock – separated at around 20oS.

The most recent quantitative assessment of Grey Mackerel was undertaken in 2014 using data from 1988 to 2011 (Lemos et al, 2014).  Helmke et al (2016) report that “the most recent stock assessment did not detect any trend in east coast Grey Mackerel abundance that might indicate overfishing of the management unit. Uncertainty in the model, particularly in the case of the North-east Queensland stock, prompted a conservative approach to sustainable yield estimates and subsequent TACC for this stock. The stock model estimated that the MSY ranged from 100–150 t and recommended a TACC of 100 t (with flexibility) for the North-east Queensland stock. The stock assessment estimated the biomass in 2011 of the North-east Queensland stock was at levels close to the biomass associated with MSY (BMSY), noting the uncertainty in the model outputs. Commercial net catches were above the recommended TACC in 2014–15 (121 t) and within the range of MSY; and annual catches of the North-east Queensland biological stock have averaged close to the recommended TACC since 2009–10 (118 t), following the introduction of the fishery-wide TACC of 250 t on 1 July 2009”.  On this basis, they concluded that the stock is unlikely to be recruitment overfished.    

Lemos et al (2014) found that for the NEQ stock, estimates of B/BMSY were fairly insensitive to initial biomass conditions and ranged between 1.4 and 2 from 1989 onwards (Figure 2).  For each of the three initial biomass scenarios modelled, the lower 80% confidence interval ratio of B/BMSY remained above 1. This provides some evidence that the stock is likely to be fluctuating at or above BMSY.  Accordingly, we have scored the stock low risk.  Nevertheless, Lemos et al (2014) note that there were difficulties in fitting the model to NE Qld data and the outcomes should be interpreted with caution.

Figure 2: Estimated mean stock status ratio B/BMSY, for SE and NE Qld (solid lines). For clarity, 80% bootstrapped confidence intervals (dashed lines) are only depicted in the left panel. (Source: Lemos et al, 2014)

(a) Stock Status – Grey Mackerel – SEQ stock

MEDIUM RISK

For the SEQ stock, Helmke et al (2016) report that “the most recent stock assessment (2011 data) did not detect any trend in east coast Grey Mackerel abundance that might indicate overfishing at the east coast-wide level or evidence to advocate against the current fishery-wide TACC of 250 t. The latest stock assessment for the South-east Queensland stock estimated the MSY at approximately 90 t (80 per cent confidence interval: 70–130 t) and recommended a TACC of 70 t. The stock assessment estimated the biomass in 2011 of the South-east Queensland stock was at levels equal to the BMSY. Catches for the commercial net fishery since 2010–11 (57 t in 2012; 53 t in 2013, 69 t in 2014 and 63 t in 2015) were lower than the estimated MSY and the recommended TACC. The above evidence indicates the biomass of this stock is unlikely to be recruitment overfished.

Based on the above it appears highly likely that the stock is above the PRI.  However, the extent to which the stock meets the second condition of the low risk SG – i.e. that the stock is fluctuating at or around a level consistent with MSY – depends on how the outcomes of the various scenarios modelled by Lemos et al (2014) are interpreted.  Three ‘plausible’ scenarios were modelled assuming different initial biomass ratios (Bini/K, where B stands for the exploitable biomass in 1988 and K denotes the carrying capacity).  Under the most optimistic scenario, the stock size was estimated to be above levels consistent with MSY with the median B2011/BMSY value estimated at 1.25 (80% c.i.: 1.08 – 1.45) (Figure 2).  Under the most pessimistic scenario, the stock was estimated to be below MSY levels with the median B2011/BMSY value estimated at 0.82 (80% c.i.: 0.71 – 0.94). No conclusion is offered around which scenario is most likely to be reflective of the ‘true’ situation.  In the absence of such analysis, and assuming each scenario is equally likely, there is at least a plausible possibility that the stock may be below levels consistent with MSY.  Accordingly, we have scored the stock medium risk. 

PI SCORE – LOW RISK – Grey Mackerel – NEQ stock

PI SCORE – MEDIUM RISK  – Grey Mackerel – SEQ stock

1B: Harvest Strategy

CRITERIA:  (i)There is a robust and precautionary harvest strategy in place.

(a) Harvest Strategy

The main measures serving to limit exploitation and monitor stock health in the ECIFFF include:

  • limited entry in the commercial fishery, regulated through numbers of commercial fishing boat licenses and associated fishery symbols;
  • gear restrictions (maximum allowable net lengths and number of nets and restricted net mesh size and net drop ranges);
  • temporal restrictions (e.g. Barramundi spawning closure Nov-Feb; weekend closures);
  • spatial restrictions under fisheries legislation (e.g. rivers and creeks closed to commercial fishers for resource allocation; Dugong Protection Area restrictions; Net Free Areas);
  • spatial restrictions under State and Commonwealth marine parks legislation (e.g. Great Barrier Reef Marine Park – GBRMP, Great Barrier Reef Coast Marine Park – GBRCMP, Moreton Bay Marine Park – MBMP, Great Sandy Marine Park – GSMP);
  • minimum legal sizes;
  • overall catch limits applied to some species/species groups (e.g. Grey Mackerel, spotted mackerel, Tailor, sharks);
  • requirement to report all retained species catches in catch and effort logbooks.

Recreational fishers harvesting ECIFFF species are subject to the same minimum legal size requirements, bag limits on some species and some fisheries and marine parks closures (e.g. green zones in the GBRMP, MBMP and GSSMP).

Fisheries Queensland collects biological data for a number of finfish species through the Fisheries Long Term Monitoring Program (LTMP) to complement the information obtained from commercial logbooks and recreational fishing diaries for various Queensland fisheries. The LTMP data include length, sex and age composition of the retained catch. Species monitored in the ECIFFF include Barramundi, Tailor, Sea Mullet, Spotted and Grey Mackerel, Yellowfin Bream, whiting (Sand, Golden-Lined and Trumpeter) and Dusky Flathead.

Periodic assessments of stock status for target species are undertaken either through the Status of Key Australian Fish Stocks (SAFS) reporting process, or through assessments of non-SAFS species examined at annual stock assessment workshops. Most assessments use a ‘weight of evidence’ approach based on available indices of abundance.  Quantitative stock assessments have been performed for some species (e.g. Tailor, Grey Mackerel, sharks).

The ECIFFF has historically been subject to a performance measurement system (PMS), albeit assessment of performance against the PMS has been infrequent in recent years (most recently assessed for the 2013 fishing year). A PMS is not part of the regulatory framework; rather, it sets out how the sustainable use of fish stocks and acceptable fishery-related impacts on the broader ecosystem are to be achieved.

Grey Mackerel – NEQ stock

PRECAUTIONARY HIGH RISK

The main measures serving to limit exploitation and monitor the harvest of Grey Mackerel include:

  • limited entry in the commercial fishery – Grey Mackerel are likely to be primarily taken by net fishers operating under N1 and N2 symbols. These are limited to 86 and 94 symbols respectively (as at February, 2017).  Fishers holding an N1 symbol may use authorized nets in areas open to net fishing throughout the east coast of Queensland.  Fishers holding an N2 symbol may use authorized nets in areas open to net fishing north of around Bundaberg;
  • a competitive TACC of 250 t, encompassing both NEQ and SEQ stocks, introduced on 1 July, 2009;
  • temporal restrictions (e.g. seasonal closure for nearshore set mesh nets and offshore nets between 1 November and 1 February in regulated waterways);
  • spatial restrictions under fisheries legislation (e.g. rivers and creeks closed to commercial fishers for resource allocation; Dugong Protection Area restrictions);
  • spatial restrictions under State and Commonwealth marine parks legislation (e.g. GBRMP, Moreton Bay Marine Park, Great Sandy Marine Park);
  • a minimum legal size – 60cm;
  • requirement to report all retained species catches in catch and effort logbooks.

Recreational catch of Grey Mackerel is subject to an in possession bag limit of five fish, although there is no overall catch or effort limit.

Routine monitoring of Grey Mackerel on the east coast of Queensland through the LTMP began in 2008 to collect biological information required for an age-structured stock assessment. This program collects biological data on length, sex and age of fish caught in the commercial, charter and recreational fisheries. Monitoring focuses on regions where most Grey Mackerel landings occur including Cairns, Townsville, Mackay, Keppel and Curtis Coasts and Hervey Bay. 

There are no formal decision rules underpinning the setting of the TACC, although the PMS for the ECIFFF establishes performance triggers which lead to review of management arrangements (DEEDI, 2009).  Triggers for action relate to catch against the TAC (TACC exceeded or <50% taken in any year) and commercial net catch rates (reduction in net catch rate >30% over 3 years), although it is not clear whether the stock has been actively assessed against the PMS in recent years (e.g. DEE, 2016). 

While Lemos et al (2014) estimated that in 2011 F/FMSY was close to 0.5 for both the SEQ and NEQ stocks (and catches have remained at roughly similar levels since), the current competitive TACC of 250t, encompassing both stocks, is higher than the combined MSY estimate of 190t-220t in the most recent stock assessment (Lemos et al, 2014).  Moreover, the current TACC is higher than the TACC recommended by Lemos et al (2014) (70t for SE Qld and 100t for NE Qld), although they noted there was flexibility in the recommended TACC.    

The minimum legal size of 60cm total length (TL) is below the size at 50% maturity for females (65-70cm TL) (Helmke et al, 2016).  Net mesh size in at least some parts of Queensland is set at a size that will take immature fish (Lemos et al, 2014).

There is little evidence to date to indicate that the harvest strategy is responsive to the state of the stock, although many of the necessary tools and monitoring arrangements are in place to support a responsive harvest strategy (e.g. TACC, LTMP monitoring, stock status assessments).  Fishery-dependent biological monitoring indicates consistent recruitment in east coast Grey Mackerel stocks, with stable length and age frequencies evident, since monitoring commenced in 2008–09 (Helmke et al, 2016). Helmke et al (2016) note that the nominal fishing effort (in number of net fishing days) has decreased by around 35% since the introduction of the TACC, while catches have been consistently below the TACC since 2009 (176t – 233t).   Overall, they conclude that the current level of fishing pressure is unlikely to result in the stock becoming recruitment overfished.  Nevertheless, the existing TACC (250t) does not appear to be precautionary in the context of the TACC recommended by Lemos et al (2014) (170t) and the MLS allows for the harvest of immature fish.  Moreover, no formal harvest control rule (HCR) exists which would serve to reduce exploitation as the PRI was approached.  To that end, there is a plausible possibility that full legal exploitation could lead to overfishing.  Accordingly, we have scored this SI precautionary high risk. 

The stock would be better positioned with a formal HCR and evidence that the TACC was set at sufficiently precautionary levels. 

Grey Mackerel – SEQ stock

PRECAUTIONARY HIGH RISK

Similar management measures to those described for the NEQ Grey Mackerel stock are in place for the SEQ stock. 

For this stock, Helmke et al (2016) report that nominal fishing effort (in number of net fishing days) decreased by around 45% on average following the introduction of the TACC in 2009.  As for the NEQ stock, fishery-dependent biological monitoring indicates consistent recruitment in east coast Grey Mackerel stocks, with stable length and age frequencies evident, since monitoring commenced in 2008–09 (Helmke et al, 2016). Overall, they conclude that the current level of fishing pressure is unlikely to result in the stock becoming recruitment overfished. For the same reasons as outlined for the SEQ stock, we have scored this SI precautionary high risk.

Shark-finning

MEDIUM RISK

In the ECIFFF, shark finning is regulated by making it mandatory for shark bodies to be held onboard with their fins and tail.  Although more recent statistics were not available, DAFF (2014a) reported that no offences relating to illegal finning were detected between 2011 and 2013. At present, there is no observer coverage in the fishery so external validation of finning practices is limited.   Stronger evidence of external validation would be required for a lower risk score.

CRITERIA: (ii) There are well defined and effective harvest control rules (HCRs) and tools in place.

(a) HCR Design and application

Grey Mackerel – NEQ and SEQ

MEDIUM RISK

The Grey Mackerel stocks appear to be in a similar position to that outlined for the Sea Mullet stock above.  The main difference is that the primary tool to reduce exploitation – a TACC – is already in place.  No well-defined HCRs exist for either stock, although ongoing stock monitoring occurs and the introduction of the TACC in 2009 to reduce the potential for exploitation of Grey Mackerel provides some evidence that the management system will act in response to concerning trends.  There is also recent evidence of well-defined HCRs being used effectively in other fisheries (e.g. coral trout, spanner crabs).  To that end, generally understood harvest control rules and tools could be said to be available which are expected reduce exploitation as PRI is approached.  On that basis, we have scored the UoA medium risk against this SI.  Nevertheless, the fishery would be considerably better positioned against this SI with well-defined HCRs setting out pre-agreed decision rules which serve to limit exploitation as PRI is approached.  As with Sea Mullet above, harvest strategies with well-defined HCRs are expected to be introduced into the ECIFFF by 2018 (DAF, 2017a).

PI SCORE – PRECAUTIONARY HIGH RISK –Grey Mackerel – NEQ/SEQ

1C: Information and Assessment

CRITERIA: (i) Relevant information is collected to support the harvest strategy.

(a) Range of information – NEQ and SEQ stocks

LOW RISK

Grey Mackerel have been subject to detailed stock discrimination studies and both stock structure and productivity is relatively well-understood (e.g. Welch et al, 2009; Lemos et al, 2014).   Likewise, fleet composition is well-understood from commercial catch and effort logbooks and periodic recreational fishing surveys (e.g. Webley et al, 2015).  Accordingly, sufficient relevant information exists to support the harvest strategy for these species.

(b) Monitoring and comprehensiveness – NEQ and SEQ stocks

LOW RISK 

Both Grey Mackerel stocks have been subject to a recent stock assessment, with commercial CPUE used as an index of abundance (Lemos et al, 2014).  Commercial retained catch data are available from commercial logbooks, while recreational catch is monitored through periodic surveys (e.g. Taylor et al, 2012; Webley et al, 2015).

Fisheries Queensland collects biological data for Grey Mackerel through the LTMP to complement the information obtained from commercial logbooks and recreational fishing diaries for various Queensland fisheries. These data include length, sex and age composition of the retained catch. Species specific information from the LTMP is published in the DAF website[1].  Based on this, stock abundance and fishery removals appear to be regularly monitored at a level of accuracy and coverage consistent with the measures in place to control harvest and are likely to be able to support an effective HCR.  Accordingly, we have scored the UoA low risk. 

[1] https://www.daf.qld.gov.au/fisheries/monitoring-our-fisheries/commercial-fisheries/species-specific-programs/monitoring-reporting/grey-mackerel-update 

CRITERIA: (ii) There is an adequate assessment of the stock status

(a) Stock assessment

Grey Mackerel – NEQ and SEQ stocks

LOW RISK 

An integrated assessment of both Grey Mackerel stocks was undertaken in 2014 (Lemos et al, 2014).  These authors used a regional, sex- and age-structured, hierarchical Bayesian population model including information about the species’ biology, morphology, and ecology.  They also complement the analysis with REML and ASPIC model fits, which display the complex features in the data, provide additional reference points, and help explain difficulties in convergence and parameter estimation.  Although subject to uncertainty, particularly for the NEQ stock, the assessment appears to be appropriate for the stock and estimates status relative to stock specific reference points.

(b) Uncertainty and Peer review

Grey Mackerel – NEQ and SEQ stocks

MEDIUM RISK

Uncertainties are identified and accounted for in the model (Lemos et al, 2014), though we are not aware that the model has been independently peer-reviewed.

PI SCORE – LOW RISK – Grey Mackerel – NEQ/SEQ

COMPONENT 2: Environmental impact of fishing

2A: Other Species

CRITERIA: (i) The UoA aims to maintain other species above the point where recruitment would be impaired (PRI) and does not hinder recovery of other species if they are below the PRI.

(a) Main other species stock status

MEDIUM RISK

The intent of this scoring issue is to examine the impact of the fishery on ‘main’ other species taken while harvesting the target species.  ‘Main’ is defined as any species which comprises >5% of the total catch (retained species + discards) by weight in the UoA, or >2% if it is a ‘less resilient’ species.  The aim is to maintain other species above the point where recruitment would be impaired and ensure that, for species below PRI, there are effective measures in place to ensure the UoA does not hinder recovery and rebuilding.

The ECIFFF is a complex fishery with multiple species targeted using a number of different net configurations across a wide geographic and habitat range.  To that end, the catch composition of the fishery may vary markedly between inshore and offshore components, different netting types and different latitudes.

To inform the identification of main other species in each of the UoAs, data on retained catch composition in the ECIFFF was provided by DAF.  For each of the three target species here – Grey Mackerel, Blacktip Shark and Sea Mullet – data were provided on the total retained catch composition when these species were recorded in the catch.  Data excluded catches taken in the ocean beach (K) sector which was assessed separately.   Sea mullet and Blacktip sharks are assessed under Component 1 in the full assessment report.

The main limitation in accurately calculating which other species meet the >5% and >2% thresholds in the ECIFFF is the absence of recent information on discards.  The most comprehensive available study of bycatch in the ECIFFF was undertaken by Halliday et al (2001).  This study examined a number of different sectors and concluded overall that net fishing had low rates of bycatch (7-28%) with a high proportion of the fish caught being marketed.  Preliminary discard fate trials indicated that post-release mortality is likely to be species dependent, with low rates of discard mortality in some commercially important species (e.g. Yellowfin Bream – 0% after 3 days) and higher rates in more fragile species (~60-70% in Silver Biddies). 

Overall they concluded that “gill nets are highly selective in their ability to capture targeted species. … Marketable catch from within these gill netting operations is high with low discard rates. The discarded component of the catch consists of a large number of species, many of which are discarded alive. These highly selective fisheries were not found to be affecting fish species that were not within the catching range of the nets allowed. Generally, the smaller the mesh size of the gill nets used in a fishery the greater the number of fish that were caught. As not all fish are marketed, particularly small ones, the bycatch component of the catch increased with decreasing mesh size.”  They concluded that “six of the seven fisheries that were investigated would be ranked in the ten lowest “observed numbers-based discard ratios other than shrimp” as reported by the FAO (Alverson et al. 1994).

There appears to have been limited detailed analysis of discarded bycatch in the ECIFFF since that time, other than targeted studies in the shark fishery (e.g. DEEDI, 2011).  Although the PMS contains a trigger point monitoring the quantity of discards against the benchmarks in Halliday et al (2001), DAFF (2014a) reported that no systematic bycatch monitoring programs were implemented during the reporting period (2010-2013) that encompassed all species and methods in the ECIFFF, and therefore the trigger point was not assessed.

Grey mackerel are typically targeted in the ‘offshore’ component of the fishery (i.e. in waters >2m deep at low tide) (Lemos et al, 2014).  Table 2 sets out the retained catch composition in the ECIFFF for all logbook records in which Grey Mackerel catches were reported.  Records show all species which accounted for >2% of the total catch in any one year between 2014 and 2016. Identiftying main other species is somewhat complicated by the reporting of shark species across multiple categories.  Of those species recorded, both the ‘Blacktip Whaler shark’ grouping and ‘Shark – Australian Blacktip’ may account for >5% of the total catch when averaged across the three years. The latter category is the common name for C. tilstoni which may also be included in the generic ‘Blacktip Whaler shark’ grouping, which also includes C. limbatus.  The grouping ‘Blacktip Whalers and Graceful’ includes both C. tilstoni and C. limbatus as well as C. amblyrhynchoides.  

Of the remaining species, both the ‘Hammerhead shark’ grouping and ‘Shark – sorrah’ (C. sorrah) are likely to account for >2% and would be considered less resilient species.  A number of hammerhead shark species including Scalloped Hammerhead Shark (Sphyrna lewini, Great Hammerhead Shark (S. mokarran) and Smooth Hammerhead Shark (S. zygaena) were added to CITES Appendix II in September 2014 and recognised under the EPBC Act to the extent that permits are required to export or import any part or derivative of these species.   These are considered under ETP species below.  None of the teleost species which may account for >2% of the catch would be considered less reilient species.

Based on that, we have assessed the three species of Blacktip Sharks – C. tilstoni, C. limbatus and C. sorrah – as main other species in the Grey Mackerel UoAs.   The proportion of C. amblyrhynchoides in the ‘Shark – Blacktip Whalers and Graceful’ category is unknown, but likely to be low (Johnson et al, 2016a)

Table 2: Retained catch composition (percentage of total retained catch) from the ECIFFF from all logbook records where Grey Mackerel was reported in the catch (Data source: DAF).

Species 2014 2015 2016
Mackerel – grey 58.06 67.87 61.26
Blacktip whaler shark 6.31 2.72 3.30
Hammerhead shark 5.36 1.53 1.86
Mackerel – Spanish 4.36 2.87 2.30
Queenfish – unspecified 3.61 4.12 3.98
Shark – Australian blacktip 3.09 2.27 7.05
Shark – sorrah 2.91 1.97 2.68
Winghead shark 2.02 0.00 0.01
Shark – Blacktip Whalers and Graceful 1.80 3.66 3.00
Mackerel – school 1.61 2.04 1.98
Other 10.87 10.94 12.58

The status of the Blacktip Shark complex which includes each of the main other species is assessed under Component 1A in the full assessment report.  Based on a weight of evidence, Johnson et al (2016a) concluded that the Queensland component of this stock is unlikely to be recruitment overfishedAccordingly, we have scored the UoAs medium risk on the basis that it is likely to be above the point of recruitment impairment (PRI), although we note that concerns have been expressed about the quality of data available for assessments (Cortes, 2016). Consistent with the discussion above, we note there are few recent data on discards in the Grey Mackerel UoAs.  Nevertheless, available information (e.g. Halliday et al, 2001) indicates that net fishing in the ECIFFF is relatively targeted with few discards.  In addition, a considerable range of measures are in place (e.g. spatial closures, temporal closures, minimum mesh sizes, maximum net lengths) which could be expected to ensure the UoAs do not hinder recovery and rebuilding if necessary.  Accordingly, we have scored this SI medium risk.    

CRITERIA:  (ii) There is a strategy in place that is designed to maintain or to not hinder rebuilding of other species.

(a) Management strategy in place

PRECAUTIONARY HIGH RISK

Generic measures in place to monitor and manage other species in the ECIFFF are largely the same those for the target species and include:

  • Limited entry through fishing boat licenses and relevant symbols;
  • Gear restrictions, including net length, number and mesh size restrictions;
  • Extensive spatial closures, though both fisheries and marine parks legislation (GBRMP, GBRCMP, GSMP, MBMP);
  • Temporal restrictions, including a three-month Barramundi spawning closure and weekend closures;
  • TACCs on some species (e.g. spotted mackerel, Tailor, sharks)
  • Compulsory reporting of retained species in catch and effort logbooks;
  • Minimum legal sizes (MLS) for many species, largely set a level that will allow spawning at least once.

Periodic stock assessments are undertaken of selected species, usually using a weight of evidence based approach[1].  No ongoing independent monitoring of catch occurs.  Although species specific risk assessments have been undertaken, no comprehensive ecological risk assessment has been undertaken for the ECIFFF.

The main other retained species taken while harvesting Grey Mackerel is the Blacktip Shark complex.   The management and monitoring arrangements for Blacktip Sharks are described under 1B above.  Although management arrangements have been substantially strengthened since 2009, there is uncertainty around the information available to assess species specific trends and the capacity of existing arrangements to respond to species specific declines.  Accordingly, we have scored this SI precautionary high risk.

There are few current measures to independently validate commercial fisher logbooks and no monitoring of discards.  

[1] https://www.daf.qld.gov.au/business-priorities/fisheries/monitoring-our-fisheries/data-reports/sustainability-reporting/stock-status-assessments

(b) Management strategy evaluation

PRECAUTIONARY HIGH RISK

For Blacktip Sharks, weaknesses in the data underlying stock assessments, the multi-species nature of the commercial TAC and recent increases in the Blacktip Shark catch mean there is uncertainty about whether the existing measures can adequately detect and respond to species specific declines in abundance.

(c) Shark-finning

MEDIUM RISK

In the ECIFFF, shark finning is regulated by making it mandatory for shark bodies to be held on board with their fins and tail.  Although more recent statistics were not available, DAFF (2014a) reported that no offences relating to illegal finning were detected between 2011 and 2013. At present, there is no observer coverage in the fishery so external validation of finning practices is limited.   Stronger evidence of external validation would be required for a lower risk score.

CRITERIA: (iii) Information on the nature and amount of other species taken is adequate to determine the risk posed by the UoA and the effectiveness of the strategy to manage other species.

(a) Information

PRECAUTIONARY HIGH RISK

The information base to support the management of sharks in the ECIFFF has substantially improved in the past decade.  New shark specific logbooks have been developed for S symbol holders, who account for around 90% of the shark catch.  The logbooks provide higher levels of species specific catch composition data than was available to 2009.  Commercial fishers’ logbook data were independently validated through limited observer coverage in 2009-2011 (DEEDI, 2011), although this program has now been discontinued.  In addition, a number of independent research projects have been undertaken to assess the likely impact of the ECIFFF on sharks stocks (e.g. Tobin et al, 2014).

Notwithstanding that, Leigh (2015) highlighted a number of weakness in the data used to identify the status and trends in shark stocks in the ECIFFF.  The problematic nature of the data weaknesses was confirmed by independent peer review which concluded they were sufficient to cast serious doubt on the results of the assessment (Cortes, 2016).  Tobin et al (2014) also noted that correct identification of many tropical shark species is difficult and fisher logbook records are unlikely to accurately reflect true catch composition. They argued that a fisher independent source of information (e.g. observer program) is mandatory for robust and accurate data collection.  Accordingly, we have scored this SI precautionary high risk.

Discards

Although there has been a very good independent study on the nature and composition of bycatch in some sectors of the ECIFFF (Halliday et al, 2001), this study is now close to two decades old and there is currently no mechanism to independently monitor total catch composition and discards from the fishery.  Moreover, the ‘offshore’ net fishery targeting Grey Mackerel and/or Blacktip Sharks was not specifically assessed as part of the Halliday et al (2001) study.  There has been limited fishery observer coverage between 2009 and 2011 (DEEDI, 2011), although the outcomes of the work have not been made public that we are aware.    The Queensland Government has committed to strengthened data collection and independent monitoring of logbooks as part of the Queensland Sustainable Fisheries Strategy 2017-2027 (DAF, 2017a) which may better position the fishery against this SI.

PI SCORE – PRECAUTIONARY HIGH RISK – Grey Mackerel – NEQ/SEQ

2B: Endangered Threatened and/or Protected (ETP) Species

CRITERIA: (i) The UoA meets national and international requirements for protection of ETP species.
The UoA does not hinder recovery of ETP species.

(a) Effects of the UoA on populations/stocks

PRECAUTIONARY HIGH RISK

A large number of ETP species are known to occur within the area of the ECIFFF including dugongs, sea turtles, sawfish, inshore dolphins, humpback whales, sea snakes, pipefish, and protected shark species (e.g. Speartooth Shark, Hammerheads) amongst others.

The information available on ETP interactions largely comes from reporting through compulsory SOCI logbooks, public reports of sick and injured ETP species compiled in StrandNet (a database of ETP – mainly dugong, turtle and cetacean – reports managed by the Queensland Department of Environment and Heritage and the GBRMPA), and periodic population surveys (e.g. Sobtzick et al, 2017; Meager et al, 2013, for a review of Dugong population surveys and trends in southern Queensland).  Fisheries Queensland operated a voluntary observer program in the late 2000s and early 2010s, but the program was discontinued in 2012. 

In the absence of independent observer information, data on interactions between the ECIFFF and ETP species is limited and can be conflicting.  For example, SOCI logbook reports indicate only one dugong interaction in the fishery in 2012, with the animal being released alive.  However, StrandNet data attributes at least two mortalities in 2012 to net fishing (Meager et al, 2013), with a number of other unconfirmed reports of net fishing interactions received.  Likewise, no sawfish or protected sharks were reported in the fishery in the years 2011 to 2013, although evidence from previous observer studies (e.g. Salini et al, 2007; DEEDI, 2011, which included effort in the ECIFFF directed at Grey Mackerel) suggests this is unlikely. 

Table 5: SOCI logbook reports of ETP species interactions in the ECIFFF (DAFF, 2014a).

Sea Turtles (Low risk)

Anecdotal evidence suggests that the majority of net fishing interactions with turtles are relatively brief in nature, with most turtles ‘bouncing off’ the net and swimming away unharmed.  This is consistent with SOCI logbook information from 2011-2013 indicating that all but two of the 115 interactions resulted in the turtle being released alive (DAFF, 2014a).  Notwithstanding that, net fishing has been implicated as a potential source of turtle mortality after extreme flooding events, where animals are in poor condition and are generally more vulnerable to capture and less able to survive interactions (Meager et al, 2013). 

Notwithstanding the possibility of occasional higher rates of mortality following floods, the generally low level of interaction across the fishery suggests that the known direct effects of the UoA are highly unlikely to be hindering recovery of the green turtles.  Census data from the southern GBR population of green turtles demonstrate that the nesting population has been increasing steadily across more than four decades at an average of about 3% per year (Limpus et al, 2013).  In some of the northern GBR nesting areas declines in nesting success have been observed, though this has been attributed to rising water tables[1].

Dugongs (Medium risk)

Dugong are a listed marine species under the EPBC Act and listed as vulnerable on the IUCN Red List.  The northern Great Barrier Reef region (from Hunter Point in the north to Cape Bedford near Cooktown further south) has the largest area of seagrass in the Great Barrier Reef and supports one of the largest populations of dugongs on the eastern Queensland coast (Marsh et al 2002). In the Great Barrier Reef Marine Park, the dugong population size is estimated at 14,000 animals (Dobbs et al 2008).  In the Queensland urban coast, including the southern part of the Great Barrier Reef and areas further south of the reef, population size has been difficult to estimate due to large scale movements of dugongs in the area (Marsh et al 2002).

Marsh et al (2001) used records from the government shark control program to hindcast changes in dugong numbers over the last four decades along a 10° latitude stretch of the urban coast of Queensland, south of Cairns. The catch per unit effort of dugongs as by-catch suggests that populations have declined to about 3% of their size in the early 1960s in this region.  However, following assessment of the carrying capacity of dugong habitats, Marsh et al. (2005) concluded that contemporary dugong habitat between 16.5°S and 28°S was unlikely to have been able to support the number of dugongs in their hindcast estimate, which suggested that they either overestimated the number of dugongs in 1962 or that the carrying capacity of the region has reduced since.  Records since the 1980s suggest the dugong population along the urban coast of Queensland has been stable (Meager et al, 2013). 

Recently, the population status of the dugong in the coastal waters of Queensland from just north of Hinchinbrook Island to the Queensland-New South Wales border was estimated using aerial survey (Sobtzick et al, 2017).  The study found that the surveyed portions of both the southern and central stock and the north Queensland and Torres Strait stock of dugong has increased since the 2011 surveys (Figure 4).  The increase was most notable in the southern GBR.  These authors attributed much of the increase to improvements in the condition of intertidal seagrass percentage cover, which were impacted by extreme weather events of 2010/11.     


Figure 4: Dugong population size estimate in 2005, 2011, and 2016 for the Southern and Central QLD and Northern QLD and Torres Strait Dugong stocks (from Sobtzick et al, 2017)

While gillnet fishing in the ECIFFF has historically been identified as an important source of human induced dugong mortality, the extent to which the fishery interacts with dugong populations under current arrangements is unclear.  Considerable management change has occurred in the fishery to reduce its impact on dugongs since the mid-1990s including:

  • the introduction of a network of Dugong Protection Areas in key dugong habitats throughout the Queensland coast, which either prohibit large mesh netting or restrict its operation;
  • Substantial spatial closures have been enacted under the GBRMP Zoning Plan 2003;
  • Attendance at net requirements;
  • Tactical spatial arrangements in ‘hot spots’ (e.g. Bowling Green Bay, South East Facing Island)
  • Reduction in large mesh netting symbols through various buyouts.

Many net fishers also take considerable care to avoid dugong interactions through best practice behaviours and novel gear designs (e.g. Welch et al, 2016).

Information provided in SOCI logbooks suggests that interaction rates are very low, however other sources suggest rates may be higher (e.g. Meager et al, 2013).  Nevertheless, the outcomes of the most recent aerial surveys suggest both the southern and northern populations of dugong are capable of increasing in number in response to favourable environmental conditions and in the presence of a relatively stable levels of netting effort.  Accordingly, the available evidence suggests that the known direct effects of the ECIFFF are likely to not hinder recovery of dugong populations.  On that basis, we have scored this medium risk.  Given the absence of independent monitoring of interactions however, it is not possible to conclude this with any greater certainty.  The fishery would be substantially better positioned against this SI with a mechanism to independently validate fisher SOCI logbook reporting.

Inshore dolphins (Precautionary high risk)

There are a number of inshore dolphin species in the area fished by the ECIFFF, although those most likely to be at risk are Indo-Pacific Humpback (Sousa chinensis) and Australian Snubfin Dolphins (Orcaella heinsohni).   Currently, there are no overall population estimates for either species and their status cannot be assessed due to the lack of data.  Nevertheless, GBRMPA (2012a) suggest that populations are likely to be in decline, and identify incidental capture in commercial gillnetting as an important risk.

Three cetaceans were reported to have been captured in ECIFFF between 2011-2013 according to SOCI logbooks, although the species is not reported (DAFF, 2014a).   There is currently no independent observer coverage in the ECIFFF to provide data validation of the SOCI logbooks.  To this end, we have scored this SI precautionary high risk. 

Sawfish (High risk)

Four species of Sawfish occur within the area fished by the ECIFFF:  Freshwater Sawfish (Pristis microdon), Dwarf Sawfish (Pristis clavata), Green Sawfish (Pristis zijsron), Narrow Sawfish (Anoxypristis cuspidata) (GBRMPA, 2012b).  All four species are listed under the IUCN Red List as endangered or critically endangered globally[2], and the three Pristis species (Green, Dwarf and Freshwater Sawfish) are listed as vulnerable marine species under the EPBC Act 1999.  Sawfish are susceptible to capture in gillnets given their distribution overlaps with target species in the ECIFFF, and because their toothed rostrum becomes easily enmeshed (Stevens et al, 2008).  Gillnetting is listed as one of the main threats to each of the Sawfish species (TSSC, 2014).

While the total population of the freshwater Sawfish is unknown, Phillips et al (2008) suggested that the species, though highly mobile when adult, should be considered in Australian waters as ‘independent demographic units’ (populations) rather than a single population. 

Stevens et al (2008) report that “available data shows a rapid decline in Sawfish numbers and a severe range retraction along the east coast. Entanglement in commercial fishing nets is the main threat to Sawfish populations.”  Moreover, Stevens et al (2005) note that Sawfish are now virtually extinct in NSW and South East Queensland.

Pristid by-catch from the Queensland Shark Control Program comprises a large dataset over about 30 years of beach meshing around major Queensland population centres during the summer months. Although species identifications or biological data are lacking, these data reportedly show a clear decline in Sawfish catch from 1970-1990, over which period the fishing effort was relatively constant (Giles et al., CSIRO Marine Research, unpublished report cited in Stevens et al. 2005).

In a conservation assessment of Sawfish, Stevens et al (2005) stated that additional closures to gillnetting of suitable inshore coastal habitat will be required in order to prevent these species from disappearing from the east coast.  In response, three rivers flowing into Princess Charlotte Bay identified as Sawfish habitat (Kennedy, Bizant and Normanby Rivers) were closed to commercial netting by the then Queensland Department of Employment, Economic Development and Innovation. 

Salini et al (2007) reported that Anoxypristis cuspidata has a high susceptibility in this fishery and should be closely monitored due to the fact that population of all species of Sawfish have declined along the east coast of Australia in the past 20 years.

There are limited reliable data on catches of Sawfish in the ECIFFF.  SOCI logbook data in DAFF (2014a) suggest that no Sawfish were taken in the fishery in 2005-6 or during the period 2010-2013, although these data appear inconsistent with previous reports indicating gillnets resulted in the highest rates of interaction of any fishing gear (Stevens et al, 2005), and isolated observer studies demonstrating capture of these species. For example, in 233 observer sea days in the ECIFFF between 2009 and 2011, over 30 Sawfish (mostly Narrow Sawfish) were incidentally captured, with a post-release mortality of around 50% (DEEDI, 2011).  Harry et al (2011) also document the catch of 75 Narrow Sawfish and seven Green Sawfish during an observer survey in the ECIFFF between 2006 and 2009.  Since 2012 there have been no independent observer data to verify interactions, and coverage rates prior to this were very low.  The extent to which this level of interaction will contribute to the species decline is unknown. 

Given evidence of capture in the fishery through observer studies, the absence of reliable independent information on interactions and strong evidence of population decline and range contraction, we have scored sawfish high risk.  

Protected sharks (High risk)

A number of sharks recognised under the EPBC Act are known to exist within the area of the ECIFFF and have some degree of interaction with the fishery.  These include Speartooth Shark Glyphis glyphis (Critically Endangered), Shortfin Mako Isurus oxyrinchus (listed migratory species) and a number of species added to CITES Appendix II in September 2014 [Sphyrna lewini (Scalloped Hammerhead Shark), S. mokarran (Great Hammerhead Shark), S. zygaena (Smooth Hammerhead Shark), Lamna nasus (Porbeagle Shark) and Carcharhinus longimanus (Oceanic Whitetip Shark)].

For hammerhead sharks, in 2014, Australia’s CITES Scientific Authority determined that Australia’s national take of hammerhead sharks would not be detrimental to the survival of the species if catch was restricted to historical levels (DoE, 2014).  Catch levels accepted as non detrimental to S. lewini, S. mokarran and S. zygaena were 200t per year, 100t per year and 70t per year respectively for Australian fisheries (DoE, 2014).   Based on catches reported between 2012 and 2015 (ranging between 52t and 98t in total across all species), DEE (2016) considered catch in the ECIFFF to be sustainable.  The ECIFFF was approved as a Wildlife Trade Operation for the purposes of taking CITES Appendix II listed species in September, 2016.

  1. glyphis was previously reported from rivers in the Princess Charlotte Bay area of Eastern Cape York (Field et al., 2008, Pillans et al., 2009; in TSSC, 2014). However, it is likely that Speartooth Sharks are extirpated from several Queensland river systems in which they were previously found, with no confirmed records from Queensland’s east coast since 1983. Remaining populations are often isolated, raising concerns about their viability (TSSC, 2014). TSSC (2014) list the main identified threats to Speartooth Sharks as commercial fishing activities, recreational fishing, Indigenous fishing, illegal, unreported and unregulated fishing (IUU), and habitat degradation and modification.

There appear to be no reliable data on the levels of catch of Glyphis in the ECIFFF, and no current independent observer program.  In the adjacent Gulf of Carpentaria, there is evidence to suggest that interactions are often underreported, with observer data from one fishery indicating that interactions with Speartooth Sharks may be significantly higher than the figures recorded in logbooks would suggest (DEEDI, 2010; in TSSC, 2014).

The primary habitat of Speartooth Sharks on the east coast of Queensland appears to be north of Princess Charlotte Bay (DoE, 2015).  This is outside the main fishing grounds for Sea Mullet and Grey Mackerel, although Blacktip Sharks may be taken. The extent to which there may be overlap between Blacktip Shark effort and Glyphis habitat is unknown. 

Given the critically endangered status of Glyphis, the absence of reliable information on interactions and observer evidence from similar fisheries in the adjacent Gulf of Carpentaria that catches may be higher than those reported in logbooks, we have scored Speartooth Sharks high risk.   

The TSSC recommended priority be placed on reviewing and improving the ability of commercial fishery monitoring programs to provide accurate (validated) data on the extent of fishery interactions with Speartooth Sharks (TSSC, 2014).

Given the inshore nature of the ECIFFF, there are likely to be very limited interactions with Porbeagle, Oceanic Whitetip and Shortfin Mako Sharks.

[1] http://www.environment.gov.au/cgi-bin/sprat/public/publicspecies.pl?taxon_id=1765

[2] http://www.iucnredlist.org/

CRITERIA: (ii) The UoA has in place precautionary management strategies designed to:

  • meet national and international requirements; and
  • ensure the UoA does not hinder recovery of ETP species.
(a) Management strategy in place

PRECAUTIONARY HIGH RISK

A considerable number of management changes have been implemented since the mid-1990s to limit the impact of the ECIFFF on ETP species.  These include:

  • the introduction of a network of Dugong Protection Areas in key Dugong habitats throughout the Queensland coast, which either prohibit large mesh netting or restrict its operation;
  • Substantial spatial closures under the GBRMP Zoning Plan 2003, the GBR Coast Marine Park, the Great Sandy Marine Park and Moreton Bay Marine Park;
  • Substantial spatial closures under fisheries legislation;
  • Attendance at net requirements, designed to improve the ability of fishers to detect interactions and release animals unharmed;
  • Tactical spatial arrangements in ‘hot spots’ (e.g. Bowling Green Bay, South East Facing Island)
  • Reduction in large mesh netting symbols through various buyouts;
  • Introduction of catch limits on hammerhead sharks in 2018;
  • Introduction of a compulsory SOCI logbook;
  • A limited period of observer coverage, albeit this was discontinued in 2012.

Grech et al. (2008) compared net fishing data between January to June 2004 and January to June 2005 to assess the risk of bycatch of dugongs under the new zoning management arrangements. They found that in January to June 2005 there was ‘nil’ risk of bycatch for all dugong management units of high conservation value identified by Grech and Marsh (2007) along the urban coast (Cairns and south) and in 36% of the corresponding units in the remote Cape York. A ‘nil’ risk of bycatch was present in half of the management units of medium conservation value. Along the urban coast, all the dugong management units of high conservation value and 90% of the units of medium conservation value where current zoning provides a low risk of bycatch to dugongs are within Zone A DPAs (Grech et al. 2008). These measures will also likely provide protection to other species inhabiting similar areas such as inshore dolphins, sawfish and protected sharks.

While actual rates of interaction remain uncertain in the absence of ongoing observer coverage, effective implementation of the above measures could be expected to result in the fishery not hindering the recovery of turtles and dugongs.  This is consistent with recent aerial survey results showing dugong population was able to increase between the 2011 and 2016 surveys with improvements inshore seagrass coverage (Sobtzick et al, 2017). The limited amount of observer coverage suggests that the majority of turtle interactions result in the animal being released alive (DEEDI, 2011). 

Nevertheless, the extent to which sawfish, inshore dolphins and some protected sharks are protected by the current arrangements is unclear. 

(b) Management strategy implementation                                         PRECAUTIONARY HIGH RISK

The measures in place could be considered likely to work for sea turtles and dugong which are relatively well studied.  The extent to which they work for sawfish, inshore dolphins and some protected sharks, which are comparatively less well studied, is uncertain.

CRITERIA: (iii) Relevant information is collected to support the management of UoA impacts on ETP species, including:

  • information for the development of the management strategy;
  • information to assess the effectiveness of the management strategy; and
  • information to determine the outcome status of ETP species.
(a) Information

PRECAUTIONARY HIGH RISK

Some quantitative information is available on interactions through SOCI logbooks, as well as through limited observer coverage (e.g. DEEDI, 2011) and periodic surveys of populations and impact on some of the relatively well-studied species (e.g. Meager et al, 2013; Sobtzick et al, 2017).  Nevertheless, the information in SOCI logbooks appears to be contradicted by other data sources in some cases and there is evidence from similar fisheries indicating that SOCI interactions are under-reported. Information on interactions with some species such as sawfish and inshore dolphins is lacking.  There is currently no independent mechanism to validate SOCI logbook reporting.     

PI SCORE –  HIGH RISK – Grey Mackerel – NEQ/SEQ

2C: Habitats

CRITERIA: (i) The UoA does not cause serious or irreversible harm to habitat structure and function, considered on the basis of the area(s) covered by the governance body(s) responsible for fisheries management

(a) Habitat status

LOW RISK

The ECIFFF net fishery targeting the species assessed here typically operates in inshore waters, from rivers and creeks to nearshore areas targeting Grey Mackerel and Blacktip Sharks.  Halliday et al (2001) reported that damage to physical environments is minimal as nets are either fished actively, being hauled across the substratum by hand, or set via anchors to passively fish a fixed position on the sea floor. Nets are typically set on sandy/muddy substrates away from hard physical structures to avoid entanglement.

In addition, net fishing is subject to extensive closed areas under fisheries and marine parks legislation (GBRMP, GBRCMP, GSSMP, MBMP) that is likely to provide protection for representative habitat types throughout the area of the fishery. 

Given the above, the UoA is highly unlikely to reduce structure and function of habitats.

CRITERIA:  (ii) There is a strategy in place that is designed to ensure the UoA does not pose a risk of serious or irreversible harm to the habitats.

(a) Management strategy in place

LOW RISK

The main management measures serving to minimise habitat impacts from the ECIFFF are:

  • Limited entry;
  • Gear restrictions (net length, mesh size);
  • Spatial closures; and
  • Temporal closures (e.g. Barramundi seasonal closure).

The impact of net fishing on bycatch and ecosystems has received at least some detailed study (e.g. Halliday et al, 2001).  Given the relatively benign nature of the apparatus and the substantial spatial closures, these measures are likely to constitute at least a partial strategy to ensure the fisheries do not result in serious or irreversible harm to habitats within the fishery area.

(b) Management strategy implementation

LOW RISK

The outcomes of Halliday et al (2001) provide some objective basis for confidence the strategy will work.  These authors noted amongst other things: “from the data presented in this study it is apparent that the use of gill netting is one of the most environmentally sensitive forms of fishing used in commercial fisheries. The ability of fishers using these apparatus to capture high proportions of targeted and marketable catches using techniques that are non-destructive to habitats, and have no detectable effect on the overall species diversity of particular areas indicate that efforts to achieve further meaningful reductions in bycatch should be focused on developing markets for only a few select species.”

CRITERIA: (iii)  Information is adequate to determine the risk posed to the habitat by the UoA and the effectiveness of the strategy to manage impacts on the habitat.

(a) Information quality

LOW RISK

The nature, distribution and vulnerability of all habitat types with the fishery are known at a level of detail relevant to the nature and intensity of the fishery.  For example, in the area of the GBRMP, a comprehensive bioregionalisation was undertaken to support the rezoning of the GBRMP (Kerrigan et al, 2010).  In Moreton Bay, Stevens (2004) mapped the benthic habitat in the Marine Protected Areas of Moreton Bay, and Beumer et al. (2012) mapped the Moreton Bay area to identify vulnerable fish habitat areas.

(b) Information and monitoring adequacy

LOW RISK

Previous studies (e.g. Halliday et al, 2001) provide insight into the potential impacts of net fishing on coastal habitats, supported by historic observer coverage.  Given the relatively benign nature of the gear, commercial catch and effort logbooks provide adequate information to detect increased levels of risk, as well as relatively fine scale information on the spatial extent of interaction. 

PI SCORE – LOW RISK – Grey Mackerel – NEQ/SEQ

2D: Ecosystems

CRITERIA: (i) The UoA does not cause serious or irreversible harm to the key elements of ecosystem structure and function.

(a) Ecosystem Status

LOW RISK

Serious or irreversible harm in the ecosystem context should be interpreted in relation to the capacity of the ecosystem to deliver ecosystem services (MSC, 2014). Examples include trophic cascades, severely truncated size composition of the ecological community, gross changes in species diversity of the ecological community, or changes in genetic diversity of species caused by selective fishing.

Halliday et al (2001) examined the impacts of a number of sectors of the ECIFFF on species diversity and composition in areas open and closed to net fishing.  They reported differences in abundance of targeted species between rivers open and closed to net fishing but did not find that abundances of prey or abundances of alternative competitors were greater in the commercially fished areas.  Amongst other things they concluded “From the data presented in this study it is apparent that the use of gill netting is one of the most environmentally sensitive forms of fishing used in commercial fisheries. The ability of fishers using these apparatus to capture high proportions of targeted and marketable catches using techniques that are non-destructive to habitats, and have no detectable effect on the overall species diversity of particular areas indicate that efforts to achieve further meaningful reductions in bycatch should be focused on developing markets for only a few select species.”   They also noted that “the low rates of bycatch that were established for each of the Queensland net fisheries indicates that levels of bycatch and its composition should not be an issue in relation to ecological impacts of the fisheries concerned.”

Given these results and the substantial number of closed areas to net fishing along the Queensland coast, it is highly unlikely the UoAs will disrupt the key elements underlying ecosystem structure and function to a point that would cause serious or irreversible harm.

CRITERIA:  (ii) There are measures in place to ensure the UoA does not pose a risk of serious or irreversible harm to ecosystem structure and function.

(a) Management strategy in place

LOW RISK

The measures to limit wider ecosystem impacts from the UoAs are largely described above.  In particular, the relatively selective nature of the apparatus and the substantial closed areas will serve to limit overall impacts of fishery on the ecosystem.  Ecosystem impacts from the fishery have been subject to detailed investigation (Halliday et al, 2001) and some ongoing independent monitoring.

(b) Management strategy implementation

LOW RISK

The outcomes of Halliday et al (2001) provide some objective basis for confidence that the strategy will work. The management measures limiting ecosystem impacts have arguably been strengthened in the period after that study with the implementation of the GBRMP rezoning and reduction in commercial license numbers.  Closed areas to the QOBNF also exist under both fisheries legislation and the MBMP and GSMP.   

CRITERIA: (iii) There is adequate knowledge of the impacts of the UoA on the ecosystem.

(a) Information quality

LOW RISK

Information on Queensland coastal ecosystem is comparatively very well studied, mainly through studies in support of the management of the GBRMP (see summarised in GBRMPA, 2012c; GBRMPA, 2014), as well MBMP (e.g. Stevens, 2004; Beumer et al. 2012).  This information is adequate to understand the key elements of the ecosystem and to detect increased risk.

(b) Investigations of UoA impact

LOW RISK

The main impacts of the fishery on the ecosystem can be inferred from existing information and some have been investigated in detail (e.g. Halliday et al, 2001).

 

PI SCORE – LOW RISK – Grey Mackerel – NEQ/SEQ

COMPONENT 3: Management system

3A: Governance and Policy

CRITERIA: (i) The management system exists within an appropriate and effective legal and/or customary framework which ensures that it:

  • Is capable of delivering sustainability in the UoA(s), and;
  • Observes the legal rights created explicitly or established by custom of people dependent on fishing for food or livelihood.
(a) Compatibility of laws or standards with effective management

LOW RISK

Commercial net fishing is managed by Department of Agriculture and Fisheries, Queensland, according to the Queensland Fisheries Act 1994 and Queensland Fisheries Regulation 2008.  A range of other legislation also impacts on the operations of ECIFFF fishers including:

  • Queensland Marine Parks Act 2004
  • Queensland Marine Parks Regulation 2006 (and subsidiary zoning plans)
  • Queensland Nature Conservation Act 1992.
  • Commonwealth EPBC Act
  • The Offshore Constitutional Settlement between the Commonwealth of Australia and the State of Queensland
  • Commonwealth Great Barrier Reef Marine Park Act 1975 and Zoning Plan 2003.

This legislation provides an effective legal framework for the purposes of delivering management outcomes consistent with the outcomes expressed by Components 1 and 2.

(b) Respect for Rights

LOW RISK

The rights of Aboriginal persons to fish for a customary purpose are recognized in the Queensland Fisheries Act and subordinate legislation.  The rights of customary fishers are recognised by the s14 exemption in the Fisheries Act that allows for an “Aborigine or Torres Strait Islander” to take fish for “the purpose of satisfying a personal, domestic or non-commercial communal need”.  Additional customary rights may be sought under Commonwealth Native Title legislation.

CRITERIA: (ii) The management system has effective consultation processes that are open to interested and affected parties. The roles and responsibilities of organisations and individuals who are involved in the management process are clear and understood by all relevant parties.

(a) Roles and Responsibilities

LOW RISK

The roles and responsibilities of the main people (e.g. Fisheries Minister, Deputy Director General) and organisations (DAFF) involved in the management of the ECIFFF are well-understood, with relationships and key powers explicitly defined in legislation (e.g. Qld Fisheries Act) or relevant policy statements.  The Department of Fisheries and Forestry, Queensland is responsible for the day-to day management of the fishery.   In addition, GBRMPA are responsible for the broader management of the GBRMP, including spatial management decisions.  Accountability relationships between the main agencies and their responsible Ministers are clear.   Compliance functions are carried out primarily by the QB&FP, although GBRMPA and DERM staff are also authorised officers under the Fisheries Act.

(b) Consultation Process

MEDIUM RISK

Until very recently, consultation was undertaken on a targeted, ad hoc basis, primarily with key stakeholder representative organisations, with formal processes to seek information from the main affected parties on important regulatory changes (e.g. release of Regulatory Impact Statements [RISs] seeking public comment).  In mid-2017, a multi-stakeholder East Coast Inshore Fishery Working Group (ECIFWG) was established as part of the Queensland Government’s Sustainable Fisheries Strategy 2017-2027.  The objectives of the ECIFWG are to:

  1. To assist with the development of fishing management options for the ECIFF Fishery consistent with the Sustainable Fisheries Strategy.
  2. To assist with the development of a harvest strategy for fishing within the ECIFF Fishery by the end of 2018.
  3. To provide advice to Fisheries Queensland on operational issues and management of fishing within the ECIFFF.

The ECIFWG includes membership from Fisheries Queensland as well as representatives from the commercial and recreational fishing sectors, seafood marketing sector, research sector, GBRMPA and the conservation sector.

Additional measures to strengthen stakeholder engagement under the Queensland Sustainable Fisheries Strategy: 2017–2027 include:

  1. The establishment of an expert advisory panel to provide independent advice to the responsible minister and Fisheries Queensland on best practice fisheries management and evidence-based decision-making;
  2. Work with Indigenous groups and communities through various forums to ensure they are engaged in fisheries management processes, such as fishery-specific harvest strategies (DAF, 2017a).

The key considerations around whether this SI scores low risk is whether the consultation process regularly seek and accept relevant information from all interested parties, including local knowledge, and whether the management system demonstrates consideration of the information obtained.  The medium risk criteria require consultation processes that obtain relevant information from the main affected parties, including local knowledge, to inform the management system.  While the new consultative structure appears capable of being a mechanism to meet the low risk criteria, the evidence base is limited given the working group has only recently been established.  To that end, we have scored this SI medium risk given the management system does include consultation processes which seeks to obtain relevant information from the main affected parties (e.g. through RISs).  Should the new consultative structure regularly seek and accept relevant information from all interested parties, including local knowledge, and demonstrates consideration of the information obtained, this SI may score low risk in future assessments.

CRITERIA: (iii) The management policy has clear long-term objectives to guide decision making that are consistent with Components 1 and 2, and incorporates the precautionary approach.

(a) Objectives

LOW RISK

The overarching objectives for the management of Queensland fisheries set out in the Fisheries Act appear implicitly consistent with Components 1 and 2 and some are explicitly set out in the Act.  The Fisheries Act 1994 states that its (1) ‘main purpose’ is to ‘provide for the use, conservation and enhancement of the community’s fisheries resources and fish habitats in a way that seeks to— (a) apply and balance the principles of ecologically sustainable development; and (b) promote ecologically sustainable development’. The Act also states that:

  • ecologically sustainable development means ‘using, conserving and enhancing the community’s fisheries resources and fish habitats so that— (a) the ecological processes on which life depends are maintained; and (b) the total quality of life, both now and in the future, can be improved’; and
  • Precautionary principle means that ‘if there is a threat of serious or irreversible environmental damage, lack of scientific certainty should not be used as a reason to postpone measures to prevent environment degradation, or possible environmental degradation, because of the threat’.

The Act further elaborates that the principles of ecologically sustainable development means:

  1. enhancing individual and community wellbeing through economic development that safeguards the wellbeing of future generations;
  2. providing fairness within and between generations;
  3. protecting biological diversity, ecological processes and life-support systems;
  4. in making decisions, effectively integrating fairness and short and long-term economic, environmental and social considerations;
  5. considering the global dimension of environmental impacts of actions and policies;
  6. considering the need to maintain and enhance competition, in an environmentally sound way;
  7. considering the need to develop a strong, growing and diversified economy that can enhance the capacity for environmental protection;
  8. that decisions and actions should provide for broad community involvement on issues affecting them; and the
  9. the precautionary principle.

PI SCORE – LOW RISK

3B: Fishery Specific Management System

CRITERIA:  (i) The fishery specific management system has clear, specific objectives designed to achieve the outcomes expressed by Components 1 and 2.

(a) Objectives

MEDIUM RISK

Generic cross-fishery objectives consistent with Components 1 and 2 are specified in the Queensland Fisheries Act, as well as other policy documents (e.g. Queensland Harvest Strategy Policy; DAF, 2017b), and are therefore implicit within the fishery specific management system. 

While the PMS, first introduced in 2009, set out explicit operational objectives for the ECIFFF consistent with Components 1 and 2, assessments against the PMS have been discontinued since around 2012 (DEE, 2016). There are few other fishery specific objectives explicit with the current management system.

To that end, existing arrangements appear more consistent with the medium risk SG.   

CRITERIA:  (ii) The fishery specific management system includes effective decision making processes that result in measures and strategies to achieve the objectives .

(a) Decision making

MEDIUM RISK

DAF’s decision-making process is set out explicitly in relevant legislation (e.g. Fisheries Act) and policy documents. Regulatory Impact Statements are released for major regulatory changes and these set out the wider implications of decisions. There is some evidence historically that the management system has responded to serious issues (e.g. through the introduction of the Dugong Protection Areas), although the very complex nature of net fishing management arrangements in Queensland do not lend themselves to timely and adaptive decision making.  The prolonged gestation of various net fishing reviews is evidence that the process has not operated at ‘low risk’ levels.

A revised decision-making framework which aims to improve flexibility and responsiveness has been proposed as part of the Queensland Government’s Sustainable Fisheries Startegy 2017-2027 (DAF, 2017a).  Effective operation of the framework, together with input from the ECIFWG, may result in lower risk scores in future assessments.

(c) Accountability and Transparency

MEDIUM RISK

Information on some components of the fishery’s performance (e.g. catch, effort, stock status, selected species stock assessments) are available through the DAF website, as well as other relevant websites (e.g.  Status of Key Australian Fish Stocks website; Australian Government Department of Environment and Energy website).  More formal annual reviews of the fishery’s performance were published as Annual Status Reports, however the most recent report was published in 2014 (for the period 2011-2014) (DAFF, 2014a). Notwithstanding that, information which would otherwise be useful in assessing the sustainability of the fishery is not published in detail, such as the stock status assessment process, observer information from the fishery and some LTMP information.

Where significant management changes are required, a RIS is released calling for public comment.  The RIS provides an explanation of the background to the proposed changes and alternative options considered. Nevertheless, in the absence of any formal consultative structure, it is not clear that explanations have been provided for any actions or lack of action associated with findings and relevant recommendations emerging from research, monitoring evaluation and review activity.  Accordingly, we have scored this SI medium risk.  We note that the newly established ECIFWG – and the public Communiques made available through the DAF website following each meeting –  provides a mechanism through which explanations may be provided to stakeholders on any action or lack of action around recommendations arising from research and monitoring.

CRITERIA: (iii) Monitoring, control and surveillance mechanisms ensure the management measures in the fishery are enforced and complied with.

(a) MCS Implementation

LOW RISK

The main measures in the MCS system include licensing, catch and effort reporting, quota monitoring for relevant species and on water patrols. General statistics on rates of compliance amongst both commercial and recreational fishers suggest that the system has demonstrated an ability to enforce relevant management measures, strategies and/or rules.  Compliance rates amongst the commercial sector are reported to have ranged between 93.7% and 94.8% between 2011 and 2013 (DAFF, 2014a), although more recent statistics are not available. 

(b) Sanctions and Compliance

MEDIUM RISK

The Queensland Boating and Fisheries Patrol (QBFP) enforces fisheries and boating safety laws through surveillance and inspection, as well as undertaking related education with industry and community groups.  The Regulations specify what constitutes a ‘serious fisheries offence’ including contravention of particular fisheries declarations, undertaking prohibited acts about regulated fish, quota offences, contravening a condition of an authority, use of explosives etc, undertaking a prescribed act, possessing or releasing a noxious fisheries resources, possessing or releasing an indigenous fisheries resources, contravening information requirements, providing false, misleading or incomplete documents, obstruction etc of an inspector. A serious fisheries offence can also be prescribed under a relevant fisheries management plan.

Those convicted of a fisheries offence may be refused application for a new or renewed fishing authority (59(1)).   The Chief Executive Officer may cancel or suspend an authority if the holder of the authority has been convicted of a fisheries offence (68A).  Furthermore, the court may, in addition to, or instead of, imposing the fine prescribed under this Act for the offence, suspend or cancel the authority and any quota relating to the authority (68B).

While the available statistics on compliance rates suggest that fishers generally comply with the management system (e.g. compliance rates are reported to have ranged between 93.7% and 94.8% in the ECIFFF during 2011 to 2013; DAFF, 2014a), there is uncertainty over the extent which fishers comply with SOCI logbook reporting obligations.  Accordingly, we have scored this SI medium risk.

CRITERIA: (iv) There is a system for monitoring and evaluating the performance of the fishery specific management system against its objectives.
There is effective and timely review of the fishery specific management system.

(a) Evaluation coverage

MEDIUM RISK

A PMS has been in place for the fishery since 2009 to evaluate performance of the management system (DEEDI, 2009), although DEE (2016) indicate assessments against the PMS have not been undertaken since 2012. In recent years, the effectiveness of the management system for targeted commercial species has been primarily assessed in the context of the annual stock status assessment process.  Effectiveness of some Component 2 management arrangements are evaluated in the context of periodic EPBC WTO assessments and annual SOCI reporting.  There are few mechanisms in place to monitor and evaluate the performance of non-target species management measures.  To that end, the fisheries meet the medium risk SG in that mechanisms are in place to evaluate some parts of the fishery-specific management system.

(b) Internal and/or external review

LOW RISK

Internal review of the management system has historically occurred through the triggering of performance measures under the PMS.   In recent years, internal reviews have been performed in response to conditions placed on the fishery through the EPBC assessment process (e.g. DAFF, 2014b,c), as well as in response to species-specific issues (e.g. introduction of new management arrangements for hammerhead sharks in 2018[1]).  Periodic external review of the fishery also occurs through the EPBC export accreditation process.  The fishery was most recently assessed in 2016, with the relevant wildlife trade operation declaration extended for two years, until 28 September 2018.  In 2008, an independent review of the ECIFFF was performed (Gunn et al. 2008). The Queensland fisheries management system was externally reviewed in 2014 (MRAG Asia Pacific, 2014).

[1] https://www.daf.qld.gov.au/about-us/news-and-updates/fisheries/news/new-rules-commence-for-hammerhead-sharks

PI SCORE – MEDIUM RISK

Acknowledgements

T​his seafood risk assessment procedure was originally developed for Coles Supermarkets Australia by MRAG Asia Pacific. FRDC is grateful for Coles’ permission to use its Responsibly Sourced Seafood Framework.

​It uses elements from the GSSI benchmarked MSC Fishery Standard version 2.0, but is neither a duplicate of it nor a substitute for it. The methodology used to apply the framework differs substantially from an MSC Certification.  Consequently, any claim about the rating of the fishery based on this assessment should not make any reference to the MSC.