Polymorphic microsatellite differences among four cultured populations of two selected tilapia strains |
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| Authors: | Dayu Li Hong Yang Zhiying Zou Wei Xiao Jingling Zhu Yongju Luo |
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| Institution: | 1. Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Chinese Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, China;2. Guangxi Fisheries Research Institute, Nanning, China |
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| Abstract: | Genetic diversity plays a vital role for maintaining economically important traits in fish populations. The goal of this study was to assess the genetic variability among four tilapia populations in China. Two populations named XA (Oreochromis aureus, 30 samples) and AN (Egyptian Oreochromis niloticus, 24 samples) were gathered from Freshwater Fisheries Research Center (FFRC), and the other two named AL (O. aureus, 30 samples) and AJ (Egyptian O. niloticus, 30 samples) were from Guangxi Fisheries Research Institute (GFRI). GFRI introduced AL and AJ from XA and AN, and selected them for generations. We want to know if AL and AJ have genetic changes after selection and generations. Fifteen polymorphic microsatellite markers were used. Our results indicated that the four tilapia populations showed moderate genetic variability. The polymorphism information content (PIC) of the four populations was from 0.28 to 0.39; Ae was from 1.67 to 2.15; the He was from 0.35 to 0.46; the genetic similarity indexes were from 0.94 to 0.69 and also the clustering result showed that these four populations were highly related. There were no significant changes in genetic variation between late‐introduced population and early‐introduced population of O. aureus. Our results helped to understand the genetic variability of tilapia populations in China and for future marker‐assisted selection for important economic traits. |
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| Keywords: | microsatellite Nile tilapia Blue tilapia heterozygosity genetic diversity selection loss of genetic variation |
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