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张网渔业是吕四渔场春夏汛群众海洋渔业的主要作业之一。其产量约占全汛总产量的3/4。然而,张网属过滤性渔具,对捕捞对象缺乏选择性,大量的幼鲳等经济幼鱼被捕捞,加速了吕四渔场鲳鱼等渔业资源的衰退。为了减少张网对幼鲳等经济幼鱼的损害。1984年江苏省水产局下达了张网释放幼鲳的研究课题。我们在分析研究现行张网的基础上,根据鲳鱼的生活习性,从网具的腹部,背部和网囊部分设计安装释放装置。进行初试,筛选出了释放效果较佳的疏目囊头释放装置,继续进行试验和初步推广应用,
Zhang net fishing fisheries fishery is one of the major operations of the masses of marine fisheries in spring and summer floods. Its output accounts for about three-fourths of the total flood season. However, Zhang net is a filter fishing gear, the lack of selectivity of fishing targets, a large number of young juveniles and other economic juvenile fish are caught, accelerated the Lv Si fishing groundfish fisheries and other recession. In order to reduce the damage Zhang net economic juveniles and other young birds. In 1984, Jiangsu Provincial Bureau of Fisheries released a research project on the release of baby nephew. Based on the analysis of the current webs, we designed and installed the release devices from the belly, back, and mesh portions of the webs according to their living habits. The first test, screening out the release of better sparse head capsule release device to continue the trial and the initial promotion and application,