Abstract
In order to understand the genetic distinctness between four Coilia fishes,i.e., C. ectenes, C. e. taihuensis, C. mystus, and C. grayii, the combined cytochrome b (cytb), 12S rRNA and 16S rRNA gene sequences were obtained and analysed. The results are as follows: 1) neighbour-joining (NJ) and maximum parsimony (MP) trees were built with 1000 bootstrap replicates. They supported that Coilia fishes consisted of two clades: C. grayii form a monophyletic group, and the rest samples form the other monophyletic group; 2) the topological differences between the NJ tree and the MP tree are checked by Templeton test, indicating that their differences are insignificant (P > 0.05); and 3) Kimura-2-parameter distances between the samples of C. ectenes, C. e. taihuensis and C. mystus are all no bigger than 1.6%, and most of them are between 0.0% and 0.9%. C. ectenes, C. e. taihuensis and C. mystus are closely related and that their differences may be under subspecies.
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