拖网网口高度测量仪的设计

A Net-openning Height Measurement Device for Trawlers

介绍一种新研制的网口高度测量仪，可为广大捕捞者正确地调整网口高度值提供精确可靠的依据。

The net-opening height of the trawling net is closely related to the catch efficiency for trawlers during fishing operations. Therefore, a precise measurement of this height and a subsequent readjustment to an optimum value in accordance to the varying fishing conditions are crucial measures to be taken for promoting catch efficiency of the trawling net. But, up to the present,the designing and manu-facturing of such device still fall behind in this country.The paper introduces a recently developed measurement instrument for measuring the net-opening height for trawling net during its fishing operation and provides reliable data for fishermen when readjusting the net-opening height。