西南大西洋鱿钓作业渔获物——阿根廷滑柔鱼生物学分析

本文通过海上生产调查分析了西南大西洋鱿钓作业渔获物-阿根廷滑柔鱼的生物学特性。结果表明：⑴公海渔场3月前后的渔获物的雌雄比例、性成熟度、盼望生渔获物性成熟个体体长方面都有所不同，据此推测3月前后公海渔场的阿根廷滑柔鱼可能分属两个不同的种群，1-2月以SSS种群的个体为主，3月后则为SPS种群的个体代替；福克兰渔场渔获物的雌雄比例、性成熟度和雌性渔获物成熟个体体长情况表明福克兰渔场的阿根廷滑柔鱼群体和公海渔场3月后的群体同属SPS种群。⑵体重测定的结果表明渔获物的个体大小随时间的推移逐渐变大，生产者应据此在不同的渔汛阶段调整对钓钩和钓线的使用。⑶阿根廷滑柔鱼主要在夜间捕食，尤其以黄昏刚入夜和黎明前为主，生产者应注意对昼夜间生产时间的把握。

ANALYSIS ON BIOLOGICAL CHARACTERISTICS OF THE CATCH OF SQUID JIGGING IN THE SOUTHWEST ATLANTIC

Based on the surveys of squid jig operation in the Southwest Atlantic in 2000, an analysis on biological characteristics of the catch - Illex argentinus is reported in the paper. The results show that 1) The ratio between males and females, the sexual maturity and the mantle length at maturity of females of the catches are quite different around March on high sea fishing ground, So it is suggested that the catch around March are composed of two stocks on high sea fishing ground in which the catch in Jan. and Feb. is mainly composed of summer- spawning stock(SSS), and the catch after Mar is replaced by south Patagonic stock(SPS). The ratio between males and females, the sexual maturity and the mantle length at maturity of females of the catches show that the catch in Falklands waters and the catch in high sea after Mar. are all composed of SPS; 2) The mantle length of the catch grows larger with time goes by and consequently the size of hooks and lines should be adjusted in accordance with different fishing seasons; 3) Illex argnetinus mainly feed at night, especially at nightfal and before dawn, and such time may be the best time for fishing.