摘 要：
根据2009年12月-2010年1月在西南大西洋阿根廷外海测定的271尾拉氏南美南极鱼生物学数据,对拉氏南美南极鱼的全长(TL)和体长(SL)组成、全长和体重(BW)关系、性比、性腺成熟度等基本生物学特性进行了分析。结果表明,(1)体长组成:全长范围为145～302mm,优势全长组为200～260mm;体长范围为135～265mm,优势体长为160～220mm。雌、雄个体全长(F=1.930,P=0.167>0.05)和体长(F=1.965,P=0.163>0.05)分布均无显著性差异。全长与体长关系为TL=0.8755SL+0.0076(R2=0.9846)(2)全长与体重关系:拉氏南美南极鱼全长与体重关系为BW=1.0845×10-6TL3.3968(R2=0.9818),雌雄拉氏南美南极鱼叉长与体重之间的关系不存在显著性差异(ANCOVA,F=1.755,P>0.05)。(3)拉氏南美南极鱼平均雌雄性比为1∶0.17。(4)12月至1月,西南大西洋拉氏南美南极鱼性成熟度基本上以Ⅱ为主,而Ⅲ～Ⅵ个体则非常少。各全长组拉氏南美南极鱼性成熟度存在显著性差异(χ2=569.59,P<0.05)。(5)首次性成熟全长为275mm,而成熟率为0.0263/mm。
译 名：
The biology characteristics of rockcod (Patagonotothen ramsayi) in the Southwestern Atlantic Ocean
作 者：
ZHU Guo-ping1,2,XU Liu-xiong1,2,CHEN Xin-jun1,2(1. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai Ocean University,Shanghai 201306,China;2. The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation,Shanghai Ocean University,Shanghai 201306,China)
关键词：
Patagonotothen ramsayi;biology characteristics;Southwestern Atlantic Ocean
摘 要：
Based on the biological data(n =271) collected in the southern Atlantic Ocean off Argentina during December 2009 to January 2010,the present study analyzed the biological characteristics of rockcod(Patagonotothen ramsayi) ,including total length(TL) ,standard length(SL) ,the relationship between TL and body weight(BW) ,sex ratio,sexual maturity and size at 50% sexual maturity. The results showed that:(1) The TL ranged from 145 to 302 mm with dominating TL of 200 to 260 mm,the SL ranged from 135 to 265 mm with dominating SL of 160 to 220 mm. The TL(F =1. 930,P =0. 167 >0. 05) and SL(F =1. 965,P =0. 163 > 0. 05) distribution between female and male individuals had no significant differences. The relationship between TL and SL was TL =0. 875 5SL +0. 007 6(R2 =0. 984 6) .(2) The relationship between TL and BW was BW =1. 084 5 × 10-6 TL3.396 8(R2 = 0. 981 8) and the relationship between TL and BW for female and male individuals had no significant differences(ANCOVA,F = 1. 755,P > 0. 05) .(3) The ratio of female to male was 1∶ 0. 17.(4) The sexual maturity was dominating of stage Ⅱ,the percentage of stages Ⅲ to Ⅵ was low during December to January. Significant difference can be found for the sexual maturity among TL classes(χ2 = 569. 59,P <0. 05) .(5) Total length at 50% sexual maturity was 275 mm and the maturation rate was 0. 026 3 /mm.
