中国凫溪香鱼与日本琵琶湖香鱼的种间差异

THE VARIETAL DIFFERENCE OF AYU BETWEEN THOSE LIVING IN FUXI STREAM OF CHINA AND IN LAKE BIWA OF JAPAN

通过对中国凫溪香鱼与日本琵琶湖、冲绳香鱼的形态特征比较研究，三者之间种间差异显著。凫溪香鱼与琵琶湖香鱼２４个项目中，有４项差异显著，１３项差异极显著。凫溪香鱼与冲绳香鱼可数性状５项，全部有显著差异；１０项频数分布有６项存在着差异。凫溪香鱼是一个既不同于琵琶湖型，又不同于琉球群岛型的地方种群。

The morphological character istics of Ayu living in Fuxi stream ofChina,in Lake Biwa of Japan and in the Ryukyus of Japan respectively has been studied,the varietal difference among them is outstanding,Of 24 ind-exes beween Ayu living in Fuxi stream of China and those in Lake Biwa of Japan there are 4 outstanding differences and 13 very outstanding diffe-rences. All of five numerable characters of Ayu living in Fuxi stream of China and in the Ryukyus of Japan have outstanding differances, and of 10 frequency distributions there are 6 differences.Ayu living in Fuxi stream of China ia a local population different from those either in Lake Biwa or in the Ryukyus.