中西太平洋金枪鱼围网渔获物组成分析

根据 2 0 0 4年 7月 2 8日至 9月 1日在中西太平洋海域的金枪鱼围网生产调查结果 ,以及“金汇 2号”2 0 0 3年全年的生产数据 ,对中西太平洋金枪鱼围网渔获物组成进行了初步分析。结果显示 ,渔获物种类有鲣鱼 (Katsuwonuspelamis)、黄鳍金枪鱼 (Thunnusalbacares)和大眼金枪鱼 (Thunnusobesus)等 19种 ;渔获物重量组成中鲣鱼占 70 .5 1% ,黄鳍金枪鱼占 2 6 .92 % ,其它鱼类占 2 .5 6 % ;鲣鱼的叉长范围为 2 7～ 81cm ,优势叉长组为 4 0～ 5 0cm ,占 4 1% ;黄鳍金枪鱼叉长范围为 32～ 16 5cm ,优势叉长组为 5 0～ 70cm ,占 33% ,另一优势叉长组为 110～ 130cm ,占 2 0 % ;渔获物重量组成存在海域差异 ,在 16 2°E以东海域鲣鱼比例高于以西海域 ,黄鳍金枪鱼则是在 16 2°E以西海域的比例较高。

Analyses on the composition of catches by purse seine from the Western and Central Pacific Ocean

The composition of catches by purse seine from the Western and Central Pacific Ocean during the period from July 28 to September 1, 2004, and the production data from JINHUI 2 in 2003 were analyzed preliminarily. The results showed that there were 19 species in the catches, the main species included skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares) and bigeye tuna (Thunnus obesus), in which skipjack tuna, yellowfin tuna and other fishes accounted for 70.51%, 26.92% and 2.56% in the catch weight, respectively. The fork length of skipjack tuna ranged from 27 to 81cm, the dominant length was 40～50cm accounting for 41%; the fork length of yellowfin tuna ranged from 32 to 165cm, one dominant length was 50～70cm accounting for 33%, and the other 110～130cm for 20%. The catch weight was different in various sea areas, the proportion of skipjack tuna in the sea area east of 162°E was higher than that west of 162°E, while yellowfin tuna was contrary to skipjack tuna.