法国北海岸船长首次使用四网板巨型中层拖网在浅水中高速捕鱼获得成功,现正在将这种渔法扩展到其他水域.这种拖网可以捕捞多种中上层鱼类(如鲱、鲐等)和底层鱼类.15年的捕鱼实践证明,放大四片式中层、拖网的尺度是成功的,但在浅水中拖网作业的主要问题是其垂直张开度接近水深度.在英国和法国之间的大西洋海峡某些水域进行中层拖网作业,就没有足够的水深以扩张网板的正常张距.如果使用底拖网网板扩张下纲,使用小型中层拖网网板扩张上纲,就能解决上述问题.一般来说,下袖端所用的底拖网网板是非常重的摩尔格雷(Morgere)椭圆多能网 For the first time, the French north coast captain succeeded in high-speed fishing in shallow water using a massive, four-barreled mid-net, which is now being extended to other waters, which can catch a wide range of pelagic species ) And the bottom fish. Fifteen years of fishing practices have demonstrated that the four-scale mid-scale enlargement has succeeded in trawling, but the main problem with trawling in shallow water is its vertical openness close to the depth of water. Between Britain and France Of the mid-level trawling operations in some of the Atlantic Ocean’s Atlantic waters do not have enough water depth to extend the normal span of the stencil. If the bottom trawl stencil is expanded, In general, the bottom trawl used at the lower sleeve end is a very heavy Morgere ellipse multipurpose mesh