摘要
根据辽宁远洋渔业有限公司“海泰”船于2001～2002年在中东太平洋进行的金枪鱼延绳钓探捕的生产数据，分析了长鳍金枪鱼延绳钓作业的捕捞努力量、渔获量及上钓率的月变化和年间变化，并对上钓率与作业渔场表层水温的关系进行了初步研究。“海泰”船平均每月下钓68568钩，2001年月均产量为2960尾；2002年月均产量为1290尾。以重量计，2001年月均产量为31373kg；2002年月均产量为15889kg。两年间相比，2002年月均产量明显低于2001年。不同月份间实际日产量波动较月产量波动小，两年间的平均日产量差异显著。不同月份间上钓率亦差异显著，而年间平均上钓率无显著性差异。不同作业海区日产量和上钓率差异极显著，A、D、E和H区日产量和上钓率较高。在水温15～22℃范围内，上钓率在0．79／6～11．1％之间波动，平均值为3．64±0．156％；水温24～30℃范围内时，上钓率在0．25％～3．7％之间，平均值为1．06±0．085％。两个温度范围的上钓率差异极显著。月平均上钓率与作业渔场月平均表层水温成显著负相关。
On the basis of the production data from tuna the vessel ＂Haitai＂ in 2001 and 2002 in the Eastern an Central longline exploratory fishing by Pacific Ocean （ECPO）, studies were conducted on the fishing effort, the catches, the monthly and annual variations in catch rate, and the relationship between the catch rate and the surface water temperature in the fishing ground. The average monthly hooks were 68 568, with the range being 40 000-100 000. The catches, however, varied greatly in different months. In 2001, the average monthly catch in number was 2 960, the range 450-6 700, or 31 373 kg in terms of weight, the range 9 000-49 990 kg. Whereas, the average monthly catch in number in 2002 was 1 290, the range 320-2 740, or 15 889 kg in terms of weight, the average 4 800-32 490 kg. Obviously, the average monthly catch in 2002 was significantly lower than that in 2001. It was also found that the fluctuation of the actual daily catch weight in different months was smaller than that of monthly catch weight. The actual daily catch weight was significantly different in between 2001 and 2002, and similarly, the monthly catch rates were also significantly different in different month. However, the average annual catch rates were not significantly different in between 2001 and 2002. Concerning different fishing areas, both the daily catch weights and catch rates were significantly different, with relatively high values being obtained in fishing area A, D, E and H. When the surface water temperature was in the range of 15-22℃, the catch rate varied between 0.7% and 11.1%, with the mean catch rate 3.64±0. 156%. If the surface water tem perature reached to 24-30℃, the catch rate varied between 0.25% and 3.7%, the mean, catch rate 1.06±0.085%. It could be seen that there existed significant difference in catch rates between the two surface water temperature range, and that the average monthly catch rate had significantly negative correlation with the average monthly surface water temperature in fishing ground.
出处
《海洋水产研究》
CSCD
北大核心
2006年第6期37-42,共6页
Marine Fisheries Research
基金
农业部渔业局"公海渔业资源探捕项目"资助
关键词
中东太平洋
延绳钓
长鳍金枪鱼
上钓率
The Eastern and Central Pacific Ocean Longline Thunnus alalungaCatch rate
