华南地区外来鱼类革胡子鲶的建群状况

The study on population establishment of alien Clarias gariepinus in main rivers of South China

为摸清革胡子鲶(Clarias gariepinus)在我国华南地区的入侵现状及种群现状,对华南地区珠江(西江、北江、东江)、鉴江、潭江和南渡江等主要河流的多个样点进行调查,并对各种群年龄结构、性比和性腺发育期等生物学特征进行研究。结果显示:华南地区各主要河流均有革胡子鲶分布,各群体均存在二龄以上个体和性成熟个体,样本性比为(♀∶♂)=1∶1.18,在调查中同时发现大量仔、幼鱼,表明革胡子鲶在华南地区各自然水域能够实现正常越冬和自然繁殖,已建立自然种群。

To study the status quo of invasive populations of Clarias gariepinus in South China,we surveyed C. gariepinus in the main rivers of South China,including the Pearl River tributary,Jianjiang River and Tanjiang River,and collected data on the age structure,gonad development. The results showed that C. gariepinus distributed in all the major rivers of South China,all populations had individuals at the age of more than two years and sexual maturity individuals. Sex ratio（ ♀∶ ♂） was 1∶ 1. 18. It suggested that it can overwinter and reproduction in natural waters,and had established natural populations in the main rivers of South China.