印度洋东部金枪鱼延绳钓渔业研究—大眼金枪鱼(Thunnus obesus)的生物学特征

Study on Tuna Longline Fishery in the Eastern Indian Ocean: the Biology of Thunnus obesus Captured

根据作者在印度洋东部海域的延绳钓生产实践 ,对渔获的大眼金枪鱼群体的群体构成、摄食、繁殖等基本生物学特征进行了初步探讨。结果表明 ,渔获群体由纯重 10～ 115 kg、叉长80～ 195 cm个体组成 ,纯重与叉长关系式 w=2 .0 0 0× 10 - 5× L2 .96 9;渔获物以 3～ 5龄个体为主 ,雄性个体所占比例明显高于雌性个体 ,且随年龄增长雄性个体所占比例逐步提高。鱼群在该海域产卵期较长 。

Based on the production in the eastern Indian ocean, the authors investigated the biology of Thunnus obesus caught by China long line, including yield composition, feeding and breeding etc. The data indicted that the size distribution of T. obesus was 10~115kg in gutted weight, 80~195cm in fork length, and the relationship between fork length and gutted weight was shown as W =2.000×10 -5 × L 2.969 . The ages of T . obesus were 3~5 mainly. There were more males than females and the proportion of males to females increased with age. The ovulation period was long in this area, and there was marked difference in gonad development among the age groups.