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草鱼、鲢鱼和镛鱼可以在长江和珠江等自然水域中产卵和孵化鱼苗。弄清草鱼、鲢鱼和镛鱼在开都河流域能否自然产卵和孵化鱼苗，对于博斯腾湖鱼类的人工投放、资源保护以及渔业捕捞具有重要的指导意义。1调查方法我们于1995年5－8月对开都河草鱼、鲢鱼和鳙鱼的溯河情况及开都河的
Grass carp, silver carp and bighead carp can lay their eggs and hatch fry in natural waters such as the Yangtze and the Pearl River. To find out whether grass carp, silver carp and bighead carp spawn naturally in the Kaidu River basin and hatch the fish fry is of great significance for the artificial feeding of Bosten Lake fish, resource conservation and fishing. 1 Method of investigation We conducted a preliminary study on the upstream of grass carp, silver carp and bighead carp in Kaidu River from May to August in 1995,