太湖中大银鱼、太湖新银鱼和寡齿新银鱼群体的遗传结构

GENETIC STRUCTURES OF POPULATION OF PROTOSALANX CHINENSIS,NEOSALANX TAIHUENSIS AND NEOSALANX OLIGODONTIS IN LAKE TAIHU

利用ＲＡＰＤ 技术对太湖中的大银鱼、太湖新银鱼、寡齿新银鱼的遗传结构进行了研究。共在太湖中的６ 个采样片采到大银鱼和太湖新银鱼样品，在两个采样片得到了寡齿新银鱼的样品。结果表明，太湖中不同水域的三种银鱼没有明显的遗传差异。三种银鱼中，大银鱼的遗传相似性指数显示最大，太湖新银鱼的次之，寡齿新银鱼的最小，说明大银鱼的遗传变异性最小，寡齿新银鱼的最大，太湖新银鱼的遗传变异性界于两者之间。

Genetic population structures of Protosalanx chinensis, Neosalanx taihuensis, and N.oligodontis in Lake Taihu were assayed using RAPD method. P.chinenesis and N. taihuensis were collected in six regions throughout the whole lake, and N.oligodontis was collected in two of the six regions. Results demonstrated that these three Salangid fishes did not reveal any structural differentiation. Genetic similarity indices suggested that P.chinensis has to lost genetic variation a greater degree because in history it suffered a greater loss in population quantity than N. taihuensis and N.oligodontis resulted from fishing pressure, while N. taihuensis and N.oligodontis have maintained somewhat larger genetic variation.