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May 14, 2021 12:40 AM EDT (Photo : Peter Simons) (Photo : Francesco Ungaro ) In so-called mixed-stock fisheries, often, Pacific salmon fisheries capture fish from various stocks (management units), sometimes reflecting locally-adapted species. During their migration along the coast, fish are intercepted in the ocean before returning to various rivers to spawn. To investigate how to fish biodiversity inside mixed-stock fisheries affects both fishery success and conservation threats, the researchers used computer simulations of hypothetical fisheries and case studies of three actual sockeye salmon fisheries, including BC s Fraser River fishery. Our paper demonstrates how biodiversity in fisheries can support fisheries by stabilizing catches from year to year, just as a diverse investment portfolio offers more consistent returns to an investor, says lead researcher Jonathan Moore of SFU s biological sciences department. However, this comes at the expense of inc ....
E-Mail IMAGE: Mixed-stock Pacific salmon fisheries can benefit from fish biodiversity while also conserving it, if productive stocks can be selectively targeted and weak stocks avoided. view more Credit: Credit: Peter Westley. A new study, by researchers from Simon Fraser University and the Department of Fisheries and Oceans, reveals the trade-offs of fish biodiversity its costs and benefits to mixed-stock fisheries and points to a potential way to harness the benefits while avoiding costs to fishery performance. Many Pacific salmon fisheries catch fish that come from multiple stocks (management units), often representing locally-adapted populations, in so-called mixed-stock fisheries. Fish are intercepted in the ocean as they migrate along the coast, returning to different rivers to spawn. ....
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