Using discard observer data to address mixed-fishery issues

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Sampling on board commercial fishing boats for estimation of discards also provides haul-level information on spatial and temporal variability in catch rates and species compositions. As well as the implications for sampling design and methods for raising to the fleet level, this can provide useful information on the nature of species linkages in mixed fisheries. Here we use data from the English discard sampling scheme to look at scales of variability in species composition of landed and discarded fish taken by different gears off the NE coast of England, with particular reference to co-occurring species requiring different management actions. The data are analysed to provide insight into possible approaches to managing these localised mixed fisheries.