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Genetic diversity of red sea bream Pagrus major in western Japan in relation to stock enhancement

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Stock enhancement is used in Japan as a tool to help the replenishment of wild populations of red sea bream Pagrus major. In this study, we analyzed the genetic diversity and composition of wild red sea bream at seven locations around Shikoku Island, South-west Japan, using three microsatellite loci. This analysis was done to test the hypothesis that: (i) red sea bream comprises a single Mendelian population along Japan; and (ii) stock enhancement programs around Shikoku Island are causing genetic differentiation among wild stocks. The results indicated that some locations from the Shikoku area were not significantly different from the rest of Japan, supporting the hypothesis of a single Mendelian population. Significant departures from Hardy–Weinberg equilibrium and significant pairwise FST among locations indicated genetic instability within this region. We suggest that the stock enhancement programs made in the region are the possible cause of this genetic instability. A management scheme for the hatcheries involved in the stock enhancement of red sea bream is presented.
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Keywords: Pagrus major; genetic diversity; microsatellites; red sea bream; stock enhancement

Document Type: Research Article

Affiliations: 1: CIBNOR, Laboratory of Aquaculture Genetics, La Paz, Baja California Sur 23040, Mexico, 2: Faculty of Agriculture, Kochi University, Nankoku, Kochi 783-8502, 3: Hyogo Prefectural Fisheries Experimental Station, Akashi, Hyogo 674 and

Publication date: 01 February 2001

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