我国金枪鱼围网渔业的初步研究

A preliminary study on fishery of tuna purse seine in China

报道2002年6月至2003年5月两艘围网渔船在中西太平洋围捕金枪鱼及每月作业状况。结果显示,70%的网次围捕浮水鱼群,其空网率达52.5%,30%的网次围捕流木鱼群,其空网率为9.5%;渔获物中鲣鱼(Katsuwonuspelamis)占90%,优势体长为40～60cm,黄鳍金枪鱼(Thunnasalbacares)占10%左右,优势体长为100～150cm;作业渔场位于5°N～5°S,137°E～178°E;两艘船每月的空网率为9%～64%,每月渔获量在185～940t之间波动,平均有效网次产量不低于20t,最大网次产量为260t。

Based on the investigation from June,2002 to May,2003 in the Central-Western Pacific, the catch operations by A and B tuna purse seine vessels are reported. The results indicated that 70% of sets was free-swimming school sets, and the rate of empty net was 52.5%; 30% of sets was floating-object sets, and the rate of empty net was 9.5%; Katsuwonus pelamis was 90% and Thunnas albacares 10% in catch weight, dominant body lengths were 40-60 cm and 100-150 cm respectively. Fishing areas were mostly lying between 5° N-5° S, 150°E- 178° E. The rate of empty net fluctuated between 9 % -64 % per month, and the catch varied from 185t to 940t one month per vessel. Mean catch per set was more than 20t and the max catch per set was 260 t.