正确选择天井网的长度,关系到拖网的渔获率和正常操作。假如拖网的天井网比预定的设计长,那么,将使网身部分形成网袋,而致大量刺鱼;当天井网过短时,网片阻力对它的载荷将更大,从而降低拖网的垂直扩张,并使腹网松弛引起事故。确定天井网长度时通常假定:连着网衣那部分的上下纲为悬链线状,空纲(手纲)为直 The correct choice of the length of the patio grid relates to the catch rate and normal operation of the trawl. If the trawl’s pavement is longer than the intended design, it will cause part of the net body to form a net bag, which will result in a large number of barbed fish. When the pavement is too short, the resistance of the net will exert greater load on it, Vertical expansion, and relaxation of the belly network caused an accident. To determine the length of the patio network is usually assumed that: attached to the part of the upper and lower parts of the network catenary catenary, empty Gang (Gang Gang) straight