模型網実験によるさくらえびひき網の網成り解析

概要

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Model tests of a commercial midwater trawl net for sergestid shrimp Sergia lucens have been carried out in a circulating water tank using a model net with a scale of 1/160. The tests and the design of the model net were based on Tauti's model law. Five kinds of test were conducted by varying the distance between the boats, the warp length, and the sinker weight, and by exchanging the ordinary wing net for a rope wing net and using a bag net without a wing net. Each test was conducted under six different towing speeds: 0.39, 0.78, 1.03, 1.17, 1.56 and 1.94 kt. The height of the net mouth is increased by decreasing the distance between the boats, by adding sinker weight and by decreasing the towing speed, while the spread of the wing ends is increased by increasing the distance between the boats and by increasing the towing speed. The resistance forces of net in towing tend to become the largest in the case of net with ordinary wing nets, and the smallest in that of the net without wing net.
日本水産學會の論文