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W76-3型多笔式鱼网位监视仪(简称网位仪)是变水层和底层拖网捕鱼作业的一种助渔仪器。借助该仪器捕捞人员可辨别出拖网是否正常,网口是否张开,网口是否碰到障碍物,网口张开高度,网口上方及下方各60米的水层中鱼群分布情况,鱼进网情况,海水温度等等,从而可及时调整网具,瞄准捕捞,决定起网与否。使用该仪器,对提高捕鱼量、发展我国海洋深水捕捞作业有一定促进作用。现将该仪器向有关读者作一简介。一、网位仪结构及性能W76-3型多笔式鱼网位监视仪主要由超声波探测发射器、水下接收器和船上接收记录器三部份组成(见图1)。
W76-3 multi-pen nets position monitor (referred to as the net position meter) is a kind of fish-changing equipment and trawl fishing operations. By means of this instrument, the fishermen can discern whether the trawling is normal, whether the net mouth is open, whether the net mouth touches the obstacle, the net mouth opening height, the fish distribution in the 60-meter water layers above and below the net mouth, the fish Into the network, the sea temperature, etc., which can be adjusted in time nets, aiming at fishing, decided to play or not. The use of the instrument has a certain promotion effect on raising fishing volume and developing deep-sea fishing in the oceans of our country. Now the instrument to the reader for a brief introduction. I. Structure and Performance of Netter The W76-3 multi-pencil net monitor is mainly composed of three parts: ultrasonic probe launcher, underwater receiver and ship receiving recorder (see Figure 1).