南海北部陆架区短蛸生物学特性研究

根据2015年8-10月在南海北部陆架区渔业生产期间采集的362尾短蛸样本,对南海北部陆架区短蛸的生物学特性进行了研究。结果表明,样本的胴长范围为24~67 mm,平均胴长为43.2 mm,优势胴长组为35~50 mm,占样本总数的70.9%;样本的体质量范围为9~124 g,平均体质量为37.0 g,优势体质量组为13~52 g,占样本总数的83.8%。不同海域短蛸的胴长和体质量组成不同,北部湾海域的样本个体要小于南海北部海域。回归分析表明,短蛸的胴长与体质量的生长最适合用幂函数表示。样本的雌、雄比例为0.66∶1;不同海域的样本性腺成熟度组成不同,南海北部海域的样本以成熟个体为主,占比66.44%,而北部湾海域的个体几乎都处于未成熟阶段;样本摄食等级以0~1级为主,占样本总数的91.4%,胃含物主要以甲壳类为主。

Study on the biological characteristics of Octopus ocellatusin the continental shelf of northern South China Sea

Based on the 362 samples of Octopus ocellatus collected during August to October of 2015 in the continental shelf of northern South China Sea,the biological characteristics were studied.The result indicated that the mantle length (ML) ranged from 24 mm to 67 mm, with an average of 43.2 mm, with a high concentration of 35 mm to 50 mm, accounting for about 70.9% of all the samples, and the body weight (BW) ranged from 9 g to 124 g, with an average of 37.0 g, and with a dominative weight from 13 g to 52 g, accounting for about 83.8%, respectively. The composition of ML and BW was different among different waters, and the samples in the Beibu Gulf waters smaller than those in the north of South China Sea. The relationship between the ML to BW was best described by the power function by the Akaike''s information criterion (AIC), respectively. The ratio of females to males was 0.66:1. However, individual in the north of South China Sea waters is given priority to with maturity stage, accounted for 66.44%, while in Beibu gulf waters, almost all in the immaturity stage. The feeding stage was mainly in 0 and 1 grades, accounting for 91.4% of all the samples and the food was mainly composed of crustacean.