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.
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