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首页> 外文期刊>ICES Journal of Marine Science >Risks and benefits of catching pretty good yield in multispecies mixed fisheries
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Risks and benefits of catching pretty good yield in multispecies mixed fisheries

机译：在多物种混合渔业中获得相当丰产的风险和利益

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Multispecies mixed fisheries catch ecologically interacting species with the same gears at the same time. We used an ensemble of size-based multispecies models to investigate the effects of different rates of fishing mortality (F) and fleet configurations on yield, biomass, risk of collapse and community structure. Maximum sustainable yield (MSY) and F-MSY for 21 modelled species' populations in the North Sea were defined at the Nash equilibrium, where any independent change in F for any species would not increase that species' MSY. Fishing mortality ranges leading to "Pretty Good Yield" (F-PGY), by species, were defined as ranges yielding >= 0.95 x MSY. Weight and value of yield from the entire fishery increased marginally when all species were fished at the upper end of F-PGY ranges rather than at FMSY, but risk of species' collapse and missing community targets also increased substantially. All risks fell markedly when fishing at the lower end of F-PGY ranges, but with small impacts on total fishery yield or value. While fishing anywhere within F-PGY ranges gives managers flexibility to manage trade-offs in multispecies mixed fisheries, our results suggest high long-term yields and disproportionately lower risks of stock collapse are achieved when F <= FMSY for all component stocks.
机译：多物种混合渔业同时捕捞具有相同渔具的生态相互作用物种。我们使用了一个基于大小的综合物种模型来调查不同捕捞死亡率（F）和船队配置对产量，生物量，崩溃风险和群落结构的影响。在Nash平衡中定义了北海21个建模物种种群的最大可持续产量（MSY）和F-MSY，其中任何物种的F的任何独立变化都不会增加该物种的MSY。导致按种类划分的“高产”（F-PGY）捕捞死亡率范围定义为产量≥0.95 x MSY的范围。当所有物种在F-PGY范围的高端而不是在FMSY捕捞时，整个渔业的权重和价值略有增加，但物种崩溃和丧失社区目标的风险也大大增加。在F-PGY范围的下限捕鱼时，所有风险均明显下降，但对总渔业产量或价值的影响很小。尽管在F-PGY范围内的任何地方捕捞都可以使管理人员灵活地管理多物种混合渔业的权衡取舍，但我们的结果表明，当所有成分种群的F <= FMSY时，可以实现较高的长期产量和较低的种群崩溃风险。

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