传统拖网系统的控制方法不甚理想,比如:拖网的水下工作深度,须凭籍渔船的前驶速度及拖绳的延伸长短予以控制;拖网的侧向收张运动,须借助于改变渔船的前进航向来加以控制。诸如此类的传统控网方法,虽承袭了前人的智慧和经验,但与日益发展起来的先进探鱼仪器相对比, Traditional trawl system control methods are not ideal, for example: the depth of the trawling underwater work, shall be based on the speed of fishing boats and the tow rope extension length to be controlled; trawl lateral movement, by means of changing the fishing boat Go forward to control. Traditional control methods such as these, although inherited the wisdom and experience of predecessors, but with the development of advanced fish-hunting instruments,