MORPHOLOGICAL VARIATIONS OF SILVER CARP, BIGHEAD AND GRASS CARP FROM CHANGJIANG, ZHUJIANG AND HEILONGJIANG RIVERS
LI SIFA ZHOU BIYUN(Shanghai Fisheries University)NI CHONGKUANG CHEN ZHENQI (Fudan University, Shanghai)
The degree of morphological divergence among the populations of silver carp, bighead and grass carp from Changjiang River, Zhujiang River and Heilongjiang River were discrib-ed. Ten morphological characteristics were measured and analyzed by discriminant function analysis mainly in high dimension. A significant difference was found among populations. The scale number on the lateral line of silver carp and bighead also show a significant difference. These differences in morphology are correlated positively with geographic distribution of populations. A discriminant and classification program has been developed, and thus the fish can be identified and classified individually by using an IBM-PC-AT computer, with 75-100% accuracy except the silver carp from Changjiang River.