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双联式虾拖网(Twin trawls)是指用浮箱式网板(Dummy door)或撬板(Sled)将两张相同规格的拖网渔具“并联”起来,由三条曳纲(尾拖式,每船拖一套)或三条手纲连接后用单曳纲(舷拖式,每舷各拖一套)拖曳的专业捕虾工具。由于它与传统的单网式网板虾拖网相比,能较大幅度地减少渔具阻力,扩大网具规格,增加单位时间的扫海面积,从而能较大幅度地提高捕虾效果。因此,自70年代初研制成功后,迅速成为欧美各国的标准捕虾工具,欧美各国已投入了较多的精力开展该种渔具的试验研究。如美国已进行了双联式虾拖网与各种传统捕虾渔具的作业性能和渔获性能的系列测试及对比试验,并在此基础上开展“舌状”拖网(一种三个上袖网的拖网)试验,取得初步成效;澳大利亚利用该种渔具进行网片结节方向对网具作业性能的影响试验;冰岛也开展过方形囊网网目对该种渔具的释放经济幼鱼的试验。
Twin trawls refer to the parallel connection of two trawl trailers with the same specifications with a Dummy door or a Sled, A set of ship drag) or a professional shrimp shrimp fishing tackle towed with a single (simplex) and towed Compared with the traditional single-net shrimp trawl net, it can greatly reduce the resistance of fishing tackles, enlarge the specifications of nets and increase the sea sweeping area per unit time, which can greatly improve the shrimp catching effect. Therefore, since its successful development in the early 1970s, it has rapidly become the standard shrimp catcher in Europe and the United States. Countries in Europe and the United States have devoted more efforts to carrying out pilot studies on such fishing tackles. For example, the United States has conducted a series of tests and comparative tests on the operation performance and fishing performance of double shrimp trawl trawl trawlers and various traditional shrimp fishing gear. On the basis of this, “tongue-like” trawling (a three- Of the trawling) test, and achieved initial success; the use of such fishing gear in Australia for mesh nodular work on the performance of tools; Iceland also carried out square capsule mesh of the fishing gear to release economic juveniles.