That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.

这一点很重要，因为理论表明，当目标鱼种的生物量为其原始水平的50%左右时，渔场才能达到可收获的最大可持续产量。

youdao

Main published work included length frequency analysis, virtual population analysis, production models, and maximum sustainable yield of Qatari fishery.

主要研究成果包括体长分析，世代分析方法，产量模型和卡塔尔国渔业的最大持续产量。

youdao

Mr Winstone said this would be a way to create a "sustainable fishery which could open for much longer".

BBC: Two cocklers on the estuary

Maine is often cited as one of the industrial world's few examples of a sustainable commercial fishery.

ECONOMIST: Maine takes on the impostors

The PNA says it aims to be most sustainable tuna fishery in the world, partly because it's the right thing to do, but also because in the long run overfishing would be terrible for PNA states' livelihoods.

WSJ: David Walter: The Great Pacific Tuna Cartel