【摘要】 报道 1 994年 1 1月至 1 996年 1 0月 (4～ 7月除外 )金丰 2号延绳钓船在中部大西洋公海 (0 9°N～ 0 5°S ,1 8°W～ 34°W )钓捕渔获物和各月经济鱼种上钩率的状况。经过鉴定共有 2 7种鱼类和一种海龟。在 2月的北纬渔场和 1 2月上半月在南纬西部渔场 (0 1°S～ 0 5°S ,2 4°W以西 ) ,大眼金枪鱼的上钩率达到高峰值 ,均大于 8‰ ,其它期间在钓捕海域上钩率在 2‰～ 8‰之间 ;在 1 1月、1 2月的北纬渔场和 1 2月上半月在南纬西部渔场 ,黄鳍金枪鱼的上钩率均大于 4‰ ,而在南纬中部渔场 (0 1°S～ 0 5°S ,2 4°W～ 1 8°W )黄鳍金枪鱼的上钩率最低 ,小于 1‰ ;箭鱼的上钩率在钓捕海域大体在 2‰以下 ,其它低经济价值的鱼上钩率几乎都小于 1‰。本文探讨了影响上钩率的因素。更多还原

【Abstract】 Based on the investigation from November, 1994 to October, 1996(except April - July) in the high sea of tropical Atlantic Ocean (09°00′N - 5°00′S,18°00′W - 34°00′W) by JING FENG NO.2 longline fishing vessel, 27 species of fish and one species of sea turtle were identified and catch rates of main economic fish were analyzed. Catch rate of Bigeye tuna(Thunnus obesus Lowe) reached the highest(excess over 8 ‰) during February in north latitude and early December in the area 1°S - 5°S, west of 24°W. But in the other area, catch rate fluctuated between 2‰ -8‰. Catch rate of yellowfin tuna(Thunnus albacare (Bonnaterre)) reached the highest (excess over 4‰)during November and December (1995)in north latitude fishing grounds and early December in the area 1°S - 5°S, west of 24°W. Catch rate of yellowfin tuna in the area 1°S - 5°S, 24°W - 18°W from August to October. 1996 was less than 1‰. Generally, catch rate of swordfish was lower than 2‰ in these fishing areas. Other low valued species catch rates were almost less than 1‰. Effect factors on catch rate were discussed.更多还原