关键词: 洞庭湖水系, (歺又鱼), 形态特征, 染色体组型

Abstract: [Objective] To study the morphological characteristics and karyotype of H. leucisculus in Dongting lake water systems. [Method] By using the conventional biological morphometry, PHA and colchicine injection method in vivo, the morphological characteristics and karyotype of H. leucisculus in Dongting lake water systems were analyzed. [Results] H. leucisculus between Dongting lake water systems in Hunan and the main stem of Yangtze river in Hubei had little difference in each character. But the three ratio traits including head length/eye diameter, head length/diameter between eyes and standard length/head length, H. leucisculus between Dongting lake water systems and the Pearl river system in Guangdong had significant differences. The numbers of H. leucisculus chromosomes in Dongting lake water systems were the same with that in the main stem of Yangtze river in Hubei and the Pearl river system in Guangdong. But the karyotypes of H. leucisculus in three areas had differences. The diploid chromosomes number of H. leucisculus in Dongting lake water systems was 2N=48 and the karyotype formula was 16M+24SM+8ST, NF=88. [Conclusion] H. leucisculus morphological diversity and karyotype diversity in different waters were found by comparison.

Key words: Dongting lake water systems, Hemiculter leucisculus, morphological characteristics, karyotyp