中国海洋大学学报（自然科学版）2012，Vol.42Issue(3)：27-35,9.
北部湾金线鱼、深水金线鱼与日本金线鱼矢耳石形态识别的初步研究
The Study on Using Otolith Morphology to Identify Three Nemipterus Fish Species:Nemipterus virgatus, N.bathybius and N.japonicus in Beibu Gulf
摘要
Abstract
The variability in sagittal otolith contour shape among three sympatric species of the genus Nemipterus: Golden threadfin bream N. Virgatus (Houttuyn, 1782) (n=54), Yellowbelly threadfin bream N. Bathybius (Snyder, 1911) (n = 71) and Japanese threadfin bream N. Japonicus (Bloch,1791) (n=65)from the Beibu Gulf were investigated,using the specimens collected from gillnet caught in Beibu Gulf central and open waters from January to September in 2010. Otolith contours were extracted and digitized by image processing, converted the gray scale image to a binary image, removed the noises, and described by elliptic Fourier descriptors(EFDs). The 77 EFD coefficients were then identified using principal component analysis (PCA) and gradual discrimination analysis (GDA) to differentiate the otoliths of three Nemipterus species. The result indicated that, length effects were significant between immature and mature individuals for N. Japonicus (P<0. 05) on otolith shape, while not significant for N. Virgatus and N. Bathybius (P>0. 05). Thus only mature individuals of N. Japonicus were used to analysis, while all individuals of N. Virgatus and N. Bathybius were used. The result showed that the 1st, 2nd and 3rd components accounted for 65. 1%, 15. 3% and 5. 3% of the total variation respectively. The GDA of EFD coefficients indicated that the average exactitude distinguish ratio of three species was 98. 6%, and the cross validation also got the high ratio 97. 9%. It indicates that the otolith elliptic Fourier shape analysis can be provided as a tool in distinguishing Nemipterus species.关键词
深水金线鱼/金线鱼/日本金线鱼/椭圆傅立叶分析/种类识别Key words
N.Virgatus/N.Bathybius/N.Japonicus/elliptic Fourier analysis/species identification分类
农业科技引用本文复制引用
侯刚,冯波,颜云榕,卢伙胜,吴仁协..北部湾金线鱼、深水金线鱼与日本金线鱼矢耳石形态识别的初步研究[J].中国海洋大学学报（自然科学版）,2012,42(3):27-35,9.基金项目
国家自然科学基金项目(30771653 （）
41006084) （）
广东省自然科学基金项目(10152408801000013) （10152408801000013）
农业部北部湾专项调查项目(2010) （2010）
广东海洋大学引进人才科研启动费(1012380)资助 （1012380）
