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中层拖网试验研究课题是省科委下达的重大科研项目。中层拖网在一些国家已是一种成熟和有效的捕捞作业。国内一些省的生产科研单位也曾先后进行过试验,且在一些远洋渔业中使用,但我省迄今还是空白。中层拖网作业方式是“瞄准捕捞”,因而准确控制网位是捕捞成功的关键。中层拖网网位除与自身的特性(网型、浮沉力配备等)有关外,还受到曳纲长度(L)、拖速(V)、两船间距(D)的影响。因此为了搞清各参数对网位的影响,检验网具的各种作业性能,为下一阶段的生产试验提供技术依据,
Middle trawling pilot research project is issued by the Provincial Science and Technology Commission major scientific research projects. Middle-layer trawling is already a mature and efficient fishing operation in some countries. Production and research institutes in some provinces in China have also carried out tests in succession and are used in some offshore fisheries, but so far the province is still blank. Middle-level trawling practices are “aiming at fishing,” so accurate control of the network is the key to fishing success. In addition to the middle layer of trawl mesh with its own characteristics (network type, floating and submerging equipment, etc.), but also by the dragline length (L), towing speed (V), two ships spacing (D) impact. Therefore, in order to find out the influence of each parameter on the network location, and to test the various operation performance of the net, it provides the technical basis for the production test in the next phase,