水产学报2011，Vol.35Issue(1)：1-9,9.DOI:10.3724/SP.J.1231.2011.17127
长江口银色鳗的形态指标体系及其雌雄鉴别
Analysis of morphological index system and discrimination of male and female silver eels(Anguilla japonica)collected at the Yangtze River Estuary
摘要
Abstract
Anguilla japonica is one of the most important commercial catadromous species in Asia.Yangtze River Estuary serves as the major production area of larval eels and the only fishery waters of adult eels in China.In this study, we analyzed biological information for 153 migrating silver eels collected at Jingjiang reach of Jiangsu Province (32°01 ‘27″N, 120°25’56″E)from Oct.to Nov.in 2007 and 2008.Based on the analysis of the morphological index system of Japanese eels with Principal Components and R-cluster Analysis the reults indicated that A.japonica could be classified by “body size and head feature”, “detail characteristics about the anterior part of snout” and “eye diameter and pectoral fin size”.On the basis of this analysis, 17 characteristics were normalized and further used for stepwise discriminant.And then 5 characteristics were picked out: fatness, vertical eye diameter/head length, body depth/body length,horizontal eye diameter/head length, snout shape.Thus the discriminant equations were built for classifying 75 samples and the accuracy rate was 89.3％.Furthermore, the other Japanese silver eels were also classified by this model and the success rate was 88.5％.ANOVA analysis showed that, apart from snout shape, the other four standardized characteristics between male and female populations were significantly different( P ＜ 0.001 ).Therefore, we concluded that the female silver eels collected from Yangtze River estuary were superior to males in the respect of fatness and body depth but smaller in eye diameter.关键词
日本鳗鲡/两性形态差异/判别分析/长江口Key words
Anguilla japonica/ sexual differences in morphology/ discriminant analysis/ the Yangtze River Estuary分类
生物科学引用本文复制引用
郭弘艺,魏凯,谢正丽,唐文乔,沈林宏,顾树信,吴嘉敏,陈文银..长江口银色鳗的形态指标体系及其雌雄鉴别[J].水产学报,2011,35(1):1-9,9.基金项目
高等学校博士点科研基金项目(20070264001) （20070264001）
国家自然科学基金项目(30771650) （30771650）
上海市科委重点项目(08391910200) （08391910200）
上海高校优青项目(B-8101-08-0016) （B-8101-08-0016）
上海市教委E-研究院项目(E03009) （E03009）
上海市重点学科建设项目(S30701) （S30701）
