Genetic drift in a hatchery and the maintenance of genetic diversity in hatchery-wild systems |
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| Authors: | MASASHI YOKOTA YASUSHI HARADA AND MASARU IIZUKA |
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| Institution: | Department of Aquatic Biosciences, Tokyo University of Fisheries, Minato, Tokyo 108-8477,; Faculty of Bioresources, Mie University, Tsu, Mie 514-8507 and; Division of Mathematics, Kyushu Dental College, Kitakyushu, Fukuoka 803-8580, Japan |
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| Abstract: | ABSTRACT: Loss of within-population genetic diversity by genetic drift is related to stocking. In order to reduce it, selective use of wild-born individuals for hatchery broodstock is proposed. Its effectiveness is evaluated by the analytical method and numerical simulation. Results indicated that it is effective, especially when the ratio of released hatchery-produced individuals is high in the natural population. Loss of within-population genetic diversity by a few other strategies of broodstock preparation is also analyzed by numerical simulation and the effectiveness of these is also discussed. |
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| Keywords: | aquaculture genetic diversity genetic drift hatchery stocking theoretical model |
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