A fishery using non-selective gear(s) that unavoidably catches a variety of species (for example, trawl nets), or in which fishers’ profits depend on the catch of more than one species. Fishery data from multispecies fisheries are more difficult to interpret because of uncertainty around the relative targeting of individual species, and therefore of the extent to which CPUE for the fishery might index the relative abundance of individual species in the mixed catch. Also, the non-selective gear(s) may make it difficult to simultaneously control the catch of each species at intended and/or individually optimal levels.