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首页> 外文期刊>Fisheries Research >Cod: Perhaps if we all stood back a bit?
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Cod: Perhaps if we all stood back a bit?

机译：鳕鱼：也许我们所有人都退后一步？

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摘要

Yellowfin tuna may sustain an industrial fishery indefinitely if managed by conventional models, but northern cod perhaps cannot. This may be a generality for tropical and cold-water fish. In their core habitat, yellowfin spawn continuously, year-round and from an early age, while northern cod mature only at middle-age and spawn only during a brief season. The resulting natural age structure of each species is well-adapted to the characteristic recruitment variability imposed by its habitat. Industrial fisheries managed by stock assessment models seem unavoidably to modify the age structure of cod so that very few spawning year-classes remain, though this does not seem to happen in yellowfin managed in a similar way. It is axiomatic that the natural age structure is that best fitted to the long-term survival of any species, and this fact implies that cold-water species exploited by an industrial fishery may be unable to sustain a viable population across periods when environmental stress is strong and recruitment weak: population collapses of cod and other cold-water fish under industrial fishing pressure may therefore be unavoidable.
机译：如果采用常规模式进行管理，黄鳍金枪鱼可能会无限期地维持工业化捕捞，但北部鳕鱼则无法。对于热带鱼和冷水鱼，这可能是普遍现象。在它们的核心栖息地，黄鳍金枪鱼一年四季都连续不断地产卵，而北部鳕鱼仅在中年才成熟，仅在短暂的季节产卵。每种物种的自然年龄结构都很好地适应了其栖息地带来的特征性募集变异性。由种群评估模型管理的工业渔业似乎不可避免地要改变鳕鱼的年龄结构，以致几乎没有产卵年级，尽管在以类似方式管理的黄鳍金枪鱼中似乎没有发生这种情况。理所当然的是，自然年龄结构最适合任何物种的长期生存，这一事实意味着，工业渔业开发的冷水物种可能无法在环境压力大的时期内维持生存种群。强捕捞能力弱：在工业捕捞压力下，鳕鱼和其他冷水鱼种群的崩溃可能是不可避免的。

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