side trawl fishing 舷拖网捕捞
beam trawl fishing 桁拖网捕捞
trawl fishing machinery 拖网捕捞机械
twoboat trawl fishing 双船拖网捕捞
cuttlefish trawl fishing 乌贼拖网捕捞
single boat trawl fishing 单船拖网捕捞
Because the three parts trawl board, trawl and trawler are an integrity in trawl fishing, it is necessary to work out a mechanical calculation of the match.
由于在生产作业中网板、拖网和拖网船是一个整体，进行三者配合的力学计算是十分必要的。
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.
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 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。
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