在以往的东、黄海底拖网渔业资源研究中，投网次数常作为渔捞努力量的度量单位。
In the previous study of trawl fishery resources of East China sea and Huanghai sea, the number of hauls is usually taken as the unit of fishing effort.
在底拖网渔业中有很多影响渔捞努力量的因素，其中船型大小、实际捕捞时间的长短以及网具改进是主要因素。
In trawl fishery, there are many factors affecting the fishing effort of which, the vessel size, actual catching time and the improvement of trawl net are the main factors.
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。
The optimum sustainable yield in fishing industry is the yield that can achieve the maximum sustainable net profit.
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