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底拖网的身网是连接网头(袖网、天井网)与囊网的扭带。就其作用而言,它是诱逼进入网口的鱼类聚集到囊网去的通道。有人认为,它的扑捞效用的积极意义比不上网头部分。然而不当的身网对捕捞效率也有一定的影响,例如:身网各节的剪裁斜率选择不当,会出现卡要、刺鱼的现象:又如身过短,会使运动中的身网稳定性降低,出现刺鱼或渔获物不进入囊网等现象:反之,过长的身网,虽然稳定性好,但网材料消耗量增大,操作不便,网阻力增大。一般认为,设计拖网时,对其结构的基本要求有:
Bottom trawl body network is connected to the network head (sleeve network, patio network) and the network of twisted band. In its role, it is a conduit that lures fish that enters the net into the net. Some people think that its positive significance of fishing utility than the Internet part. However, improper body network of fishing efficiency also have a certain impact, for example: body section of the section of the shear slope of the inappropriate choice, there will be card to the phenomenon of barbed fish: Another example is the body too short, will make the movement of the body network stability Reduce the occurrence of barbed fish or catches do not enter the cyst and other phenomena: the other hand, too long body network, although the stability is good, but the net material consumption increases, the operation inconvenience, the network resistance increases. Generally believed that the design of trawl, the basic requirements of its structure are: