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。
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。
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。
As long as high fishing efforts exist in the Yellow Sea, it is impossible for the stock to recover and to reach maximum sustainable yield.
只要黄海周围过高的捕捞力量的存在，小黄鱼资源很难得以恢复并达到最大持续产量。
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。
Stock assessment is not only to forecast the static optimum fishing effort and sustainable yield, but also to assess the reactions of fish and fishermen to management choices and other changes.
资源评估不仅仅是预测静止的最佳捕捞努力量和持续产量，而是评估鱼类和渔民对管理决策和其它变化的动态反应。
Stock assessment is not only to forecast the static optimum fishing effort and sustainable yield, but also to assess the reactions of fish and fishermen to management choices and other changes.
资源评估是应用各种统计和数学方法量化地研究鱼类种群形态对渔业管理选择的反应。
In order to keep sustainable high and stable yield, it was essential to shape proper crown of trees and strengthen technical management.
生产中要加强技术管理，培养合理的树冠，以便保持持续的高产、稳产。
Ancient laborers paid great attention to adopting various techniques to improve soil quality when plowing the soil, so that the soil could keep sustainable fertility and high rate of yield.
古代劳动人民在土壤耕作过程中，非常注意采用各种技术对土壤性质进行改良，以期土壤保持长久不衰的肥力和高产出率。
Ancient laborers paid great attention to adopting various techniques to improve soil quality when plowing the soil, so that the soil could keep sustainable fertility and high rate of yield.
古代劳动人民在土壤耕作过程中，非常注意采用各种技术对土壤性质进行改良，以期土壤保持长久不衰的肥力和高产出率。
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