金枪鱼(Thunnus)延绳钓作业研究——以印度洋东部中国船队为例

Study on the Tuna Long-Line Fishing——An Instance of Chinese Fleet in Eastern Indian Ocean

报道中国水产总公司金枪鱼船队 1997年 5月至 1999年 5月期间在印度洋东部海域进行延绳钓作业的有关情况。结果显示 :船均月产量 ,以尾数计在 4 9～ 175尾之间波动 ,最高出现于1998年 9月 ,最低出现于 1997年 5月 ,平均 116尾 /船·月 ;以重量 (纯重 )计在 1559～ 630 6kg之间波动 ,最高出现于 1999年 2月 ,最低出现于 1997年 5月 ,平均达 4 0 64kg/船·月。月均上钓率在0 .4 7%～ 2 .2 8%之间波动 ,平均 1.0 2 % ,船间及月间差异显著。船月均下钓 52 0 8～ 15558个。

This paper reports the situation of the long line fishing when China National Fisheries Corporation worked in the eastern Indian Ocean from May, 1997 to May, 1999. The result showed that when calculated by number the yield per month waved from 49 to 175, the highest yield was in September, 1998 and the lowest yield was in May, 1995, the average yield being 116 per boat per year; when calculated by weight (net weight), the yield per month waved from 1559 to 6306 kg, the highest yield was in Feb.1999, and the lowest yield was in May, 1997. The average yield was 4064 kg per boat per month. The get hooked rate per month fluctuated from 0.47% to 2.28% and the average was 1.02%. There is a prominent difference in boats and months. The average hooks cast by these boats ranged from 5208 to 15558.