2011年西南大西洋拖网渔获物阿根廷滑柔鱼生物学分析

根据2011年1月～4月双拖网船在西南大两洋作业时采集的901尾阿根廷滑柔鱼（lllex argentinus）样本，对其渔获群体组成、摄食等级、胴长-体质量关系以及性腺发育等进行了分析。结果表明，样本个体大小随采样时间的推移有明显增大趋势；小胴长组阿根廷滑柔鱼的摄食能力较大胴长组弱，摄食等级的高低与其繁殖高峰期有关。阿根廷滑柔鱼雌、雄初次性成熟胴长分别为191．6mm和182．6mm，性腺成熟度为Ⅴ期个体的平均胴长小于处于Ⅲ、Ⅳ期个体的平均胴长。综合分析推测，该研究采集的901尾样本为南部巴塔哥尼亚群体和夏季产卵群体的混合样本，在拖网作业后期，渔场补充了部分大个体的夏季群体。

An analysis of biological characteristics of Argentine shortfin squid Illex argentinus collected by trawl in southwest Atlantic in 2011

In base of 901 individuals of Argentine shortfin squid （lllex argentinus） collected in continental shelf and slope of southwest Atlantic by twin trawls during January to April in 2011, we determined their population composition, feeding intensity, lengthweight relationship and gonadal development. The results show that the mantle length of the samples increases along with the sampling time. Feeding ability of small-mantle-length groups is weaker than that of big-mantle-length ones, which is related with fecundity peak period. The mantle length of first maturity for females and males is 191.6 mm and 182.6 mm, respectively. The average mantle length in maturity Stage Ⅴ is shorter than that in Stage Ⅲand Ⅳ. The results suggests that the catch is composed of south Patagonia stock （SPS） and summer spawning stock （ SSS）, and recruitment of some big-mantle-length summer population is found in post trawling.