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

Maximum sustainable yield----The maximum harvest that could be sustained forever.

最大持续产出——能够持续很久的最大收益。

youdao

The optimum sustainable yield in fishing industry is the yield that can achieve the maximum sustainable net profit.

渔捞业中的最佳经济产量是指能使持续的纯利润最大的产量，此时投入的捕捞努力量为最佳经济捕捞努力量。

youdao

The European Parliament is under pressure from green activists who want hard biomass targets, which measure the largest maximum sustainable yield (MSY) - or largest catch - by weight.

BBC: EU agrees to new fish dumping laws

Under the new proposals, the EU will shift from the current bargaining over quotas - a system often attacked by environmental groups - to fishing based on "maximum sustainable yield" (MSY).

BBC: Euro MPs back large-scale fishing reform to save stocks

Deininger and Byerlee (2011) Rising Global Interest in Farmland: Can it Yield Sustainable and Equitable Benefits?

UNESCO: TH?MES