海蜇帆张网的设计与生产试验

本文报道了1996～1997年江苏省启东市海蜇张网的改革和试验结果。文章分析了海蜇鱼发多变、体型较大和常漂游于水域中上层的特点,提出用锚张网替代桩张网,使用大网目以扩大网口并在网口两侧加装柔性帆板以增大水平扩张。改进设计的海蜇帆张网经较大规模的海上生产试验在1997年取得大面积丰收。单船平均网次产量比原用桩张网增加3倍多。文章针对吕四渔场流速(2.5～3.5节)对网具规格及阻力、锚具重量和爬驻力以及渔船起网鼓轮绞拉力之间的相互制约关系提供了经验计算式。文章指出,这种海蜇帆张网的推广、使用必须强化管理,以确保伏休制度得到贯彻。

THE DESIGN AND PRODUCTIVE EXPERIMENT OF CANVAS STOWNET FOR JELLYFISH

The paper gives a report on the reformation and the results of experiment of stownet for jellyfish from 1996 to 1997 in Qidong, Jiangsu province. Based OH the behavior of jellyfish, the authors propose the use of anchor stownet to substitute pocket stownet, the use of large mesh size to enlarge the mouth and with the soft carvases added to both sides of the mouth to enlarge the horizontal expansion. Having been improved the design, the canvas stownet for jellyfish was put into large - scale productive experiment at sea. The yield of average haul per boat was more than three times than that of the original pocket stownet. In view of lots of restrict factors, such as flow speed, net specification and drag, the empirical, calculation formulae were provided. The popularization and use of canvas stownet for jellyfish must be given special attention to the management, so as to ensure to carry out the system of closed fishing in summer season.