생력형 기선권현망 어구의 전개성능

Abstract

This study was conducted in order to improvement of fishing gear and fishing operating system for anchovy boat seine by labor saving improved nets.Field experiments were carried out observe geometry of nets and fishing operating system by catcher boats.The obtained results are summarized as follows :The Vertical net opening of fore wing net, wing net, inside wing net, square, fore bag net, flapper, after bag net of the labor saving improved net according to the distance between catcher boats were varied in the range of 5.0～7.8, 14.4～21.1, 16.2～21.2, 14.0～17.3, 11.7～13.9, 5.4～6.9, 8.2～9.8m respectively, varied in the range of 50～78, 25～36, 24～31, 31～38, 61～73, 71～91, 87～104% of the actual ratio of net opening in each part.Labor saving improved net was performed instant net opening in fore wing net and maintained stable net opening and towing depth by means of attached net pendant. Also, it was minimized as net pocket phenomenon leading to guide anchovy for more catch by means of attached body net. The opening shape of labor saving improved net was more stable and less variation of net opening in accordance with distance between catcher boats and towing speed.The catch of labor saving improved net was increased than traditional net due to decrement of net resistance by improvement of bag net leading to increasement of towing speed and reduction of escape anchovy as well as improve nets of whole operation system.