西南大西洋公海阿根廷滑柔鱼生物学特性的初步研究

Biological characteristics of squid Illex argentinus in the high sea waters of Southwest Atlantic Ocean

以2009年1—4月中国鱿钓船在西南大西洋公海生产期间连续采集的阿根廷滑柔鱼Illex argentinus为样本(6 094尾),对其生物学特性进行初步分析。结果表明:渔获物胴长为148～307 mm,优势胴长为200～260 mm,占总数的86.5%;体重为76～586 g,优势体重为150～300 g,占总数的78.7%,判定该渔获物主要来自南巴塔哥尼亚种群;胴长(L)与体重(W)的关系式为W=1.2×10-4L2.6779;渔汛期间,胴长、体重与时间之间均符合指数方程模式,分别为Lt=207.54e0.0013t和Wt=181.52e0.0046t;阿根廷滑柔鱼性成熟度以Ⅱ期为主,占总数的56.8%,初次性成熟的胴长为244.7 mm;摄食等级以2级为主,占总数的52.0%。

The biological characteristics of squid Illex argentinus were studied in about 6094 samples collected from Chinese squid jigging vessels in the high sea waters of Southwest Atlantic from January to April in 2009.The results showed that the squid mantle length was found to be ranged from 148 to 307 mm with dominant size between 200 mm and 260 mm,accounting for 86.5% of the total number,and body weight from 76 to 586 g with majority of 150-300 g（78.7%）.The relationship between mantle length and weight was expressed as the equation W=1.2×10^-4L^2.6779.The relationship between mantle length or body weight and time was described by the exponential function during the fishing seasons as Lt=207.54e^0.0013t and Wt=181.52e0.0046t respectively.About 56.8% of the squid was found to be at maturity of stage II,and the first mature squid（52.0%） had mantle length of 244.7 mm and the stomach fullness of degree II.