六种鲤科鱼类耳石形态以及在种类和群体识别中的应用

OTOLITH MORPHOLOGY OF SIX CYPRINID SPECIES WITH THE USE IN SPECIES AND STOCK DISCRIMINATIONS

描述了6种鲤科鱼类的耳石形态特征,并利用耳石形态的测量性状,对其种类特征进行了判别分析。其中,对张氏(卜夕又鱼)、长鳍吻鮈、圆口铜鱼、宜昌鳅（鱼它）和鲫的判别正确率为100％,异鳔鳅（鱼它）的判别正确率为90.91％,6种鱼类的平均判别正确率达到了99.1％,说明了鱼类的耳石形态特征可以用于鉴别种类。三个区域鲫群体的平均判别正确率为68.9％,显示三个区域鲫群体的耳石形态存在一定的差别。

Morphological characteristics of the otoliths of six cyprinid species, Hemiculter tchangi, Rhinogobio ventralis, Coreius guichenoti, Gobiobotia filifer, Xenophysobotia boulengeri, and Carassius auratus, had been described and measured. The stepwise discriminant analysis was used to distinguish these six species. The classification success for H. tchangi, R. ventralis, C. guichenoti, G. filifer and C. auratus was 100%, and X. boulengeri 90.91 % with the average of 99.1 % for all six species. So the otolith traits of fish might be one of useful tools for discriminating the fish species. The classification accuracy of C. auratus stocks from three locations reached 68. 9 percent on average. It demonstrated that some significant differences in otoliths did exist among three C. auratus stocks.