Genetic Structure Analysis Of Selected Populations And Construction Of Genetic Linkage Map Of Marine Shrimp Fenneropenaeus Chinensis

1.The selected fast-growth population of shrimp Fenneropenaeus chinensis had been examined and approved by China National Aquaculture Variety Approval Committee as a new variety for aquaculture and named as"Huanghai No.1"in 2004. Researches have been carried out to study the variance of genetic diversity of the new variety, however, no elaborate analysis of morphologic characters of the new variety was conducted. This paper presents results of studies on the comparison of morphologic characters in the wild and selected"Huanghai No.1"populations of shrimp Fenneropenaeus chinensis base on 11 morphological characters using the method of statistics, including ANOVA analysis and two types of multivariation analyses. ANOVA analysis and t-test indicated that different populations showed some morphological variations, which reflected by the longer length of the 3st, 5st and the 6st somites and the narrower width of carapace and the first somite of selected population compared with that of wild population. In the principal component analysis, four principal components were constructed, the contributory rates of the first, second, third and fourth principal component were 18.14%, 15.09%, 11.09%, and 9.53%, respectively. The cumulative contribution rate was 53.85%. The results revealed that the differences in transverse factor were most significant, which were in accordance with the conclusions of t-test. The results of discriminant analysis revealed that there were significant differences between the two populations (P<0.0001). The identification accuracy were 62%-75% (P₁) and 55.4%- 79.8% (P₂), respectively. The total discriminant...