暗纹东方鱼屯生殖期两性判别的研究

A STUDY ON THE SEXUAL IDENTIFICATION OF TAKIFUGU OBSCURUS IN REPRODUCTION PERIOD

暗纹东方鱼屯俗称河豚，属江海洄游性鱼类。生殖季节，雌、雄个体副性征差异不明显，不能采用常规鉴别方法进行性别鉴定。作者根据体征、体态特征，采用综合指标判别法对１９９５年３月１５日至５月３０日在江苏仪征—泰州６０ｋｍ江段渔获的１０３８尾暗纹东方鱼屯进行了雌、雄性别判定，正确率达９５．４％。该方法操作简单，不伤鱼体，仅凭眼观即可判定自由游动状河鱼屯的雌、雄。文中有关利用行为差异来判定鱼类雌、雄的方法，国内外尚未见诸报道。该项工作为鉴别鱼类性别提供了一种新方法。

Takifugu obscurus, popularly named obscure puffer, is a fish of river to sea migration. Normal sexual identification method fails when in reproduction period, because of no remarkable difference between individual in secondary characters. A comprehensive sexual identificationmethod based on feature and posture was applied to 1 038 ind. of puffer, which were caught from March 15 to May 30 in 1995 in the lower a reach of Yanqtze River from Yizheng to Taizhou, with in a distance of sixty kilometers.The accurate percentage reaches 95.4%. This method does not injure the sample, and it is so simple that it could do even when the puffer is in a state of free swimming in pool. The method,i.e. the fish behaviour pattern method, of fish sex identification is reported for the first time. The study offers a new method on the sexual identification of fish, and it has certain contribution to the artificial propagation and production of fish.