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1 引言在虾拖网渔业的混合渔获中鱼的平均分布率高达81%,不仅鱼类资源有巨大浪费,而且对鱼类资源的繁殖也产生严重影响。为了减少幼鱼副渔获,经常采用网囊的网目选择性。但是,早期的研究证明,许多变量影响拖网和其他移动性渔具中鱼类的尺寸选择。要克服的最大问题之一就是网囊渔获增加后有效网目张开减小。
1 INTRODUCTION The average distribution rate of fish in mixed fishing of shrimp trawl fisheries is as high as 81%. Not only is there a huge waste of fish resources, but also a serious impact on the reproduction of fish stocks. In order to reduce juvenile by-catch, mesh reticulation selectivity is often used. However, earlier studies demonstrated that many variables affect the size selection of fish in trawls and other mobile gear. One of the biggest problems to overcome is that the net catches open and the number of effective necks decreases.