Abstract:

Study on biological characters and diversity based on RAPD of white shrimp (Exopalaemon modestus) in Taihu Lake and Chaohu Llake was carried out in this paper.The result showed that in Taihu Lake dominant body length was 40-50mm(covering 69.3% of total) and dominant body weigh was 0.5-2.0g(covering 83.4% of total),and the correlative equation between body-length(mm) and body-weight(g) could be expressed as W=2.6E-05L2.8777. While in Chaohu Lake dominant body length was 45-55mm(covering 73.8% of total) and dominant body weigh was 1.5-2.5g(covering 69.0% of total),and the correlative equation between body-length(mm) and body-weight(g) was W=2.6E-05L2.8471. The result of RAPD by 15 random primers showed that the proportions of polymorphic loci of populations of Exopalaemon modestus in Taihu Lake and Chaohu Lake were 49.16% and 48.78%, respectively. The intra-population genetic similarity coefficients of Taihu Lake and Chaohu Lake were 0.8817 and 0.8735 respectively. Inter-population genetic distance between the two populations was 0.0311, which showed there was not obvious genetic differentiation between the two populations from Taihu Lake and Chaohu Lake.