而在地中海，在旗鱼的捕捞中，它们占副渔获物的九成。
And in the Mediterranean, in the swordfish net fisheries, they make up up to 90 percent.
很不幸，在加州漂网的副渔获物中，翻车鱼占到了26%。
And unfortunately, they make up a large portion of the California by-catch — up to 26 percent of the drift net.
由于渔具不同的选择性和多鱼种鱼类共栖，人们在对目标种类进行捕捞时，不可避免地产生副渔获物及其抛弃。
Because of the selectivity of fishing gear and mixed distribution of fish species, there will be inevitably by-catches and discards when people catch the target species.
实践证明，拖网分离栅能够有效地提高拖网作业的选择性，降低副渔获物和抛弃，保护渔业资源，因此，许多国家通过立法使其被强制使用。
Trawl sorting grids can effectively enhance the selectivity of trawl, reduce by-catch and discards, protect fish resources, which are compulsively used in many countries by legislation.
实践证明，拖网分离栅能够有效地提高拖网作业的选择性，降低副渔获物和抛弃，保护渔业资源，因此，许多国家通过立法使其被强制使用。
Trawl sorting grids can effectively enhance the selectivity of trawl, reduce by-catch and discards, protect fish resources, which are compulsively used in many countries by legislation.
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