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ICES Journal of Marine Science: Journal du Conseil 2006 63(7):1353-1363; doi:10.1016/j.icesjms.2006.03.024
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© 2006 International Council for the Exploration of the Sea

A review of Pacific salmon hatchery programmes on Hokkaido Island, Japan

Kentaro Moritaa,*, Toshihiko Saitob, Yasuyuki Miyakoshic, Masa-aki Fukuwakaa, Toru Nagasawaa and Masahide Kaeriyamad

a Hokkaido National Fisheries Research Institute, Fisheries Research Agency 116 Katsurakoi, Kushiro 085-0802, Japan
b National Salmon Resources Center, Fisheries Research Agency 2-2 Nakanoshima, Toyohira-ku, Sapporo 062-0922, Japan
c Hokkaido Fish Hatchery 3-373 Kitakashiwagi, Eniwa 061-1433, Japan
d Graduate School of Fisheries Sciences, Hokkaido University Hakodate 041-8611, Japan

*Correspondence to K. Morita: tel: +81 154 92 1720; fax: +81 154 91 1715. e-mail: moritak{at}affrc.go.jp.

Hatchery programmes involving the mass release of cultured fish have been implemented worldwide to supplement wild populations and to increase harvests. Hokkaido Island is one of the most active regions for Pacific salmon hatchery programmes, with ca. 1.2 billion (109) juveniles released annually along a coastline of ca. 3000 km. During the last quarter of the 20th century, coastal catches of chum and pink salmon increased dramatically, whereas those of masu salmon did not. In addition to the development of hatchery technologies, several possible hypotheses may explain these catch trends, including climate change, closing of high-seas fisheries, rehabilitation of water quality, habitat loss caused by damming and channelling, and increased pressure from recreational fisheries. Even when these other factors have been accounted for, it is difficult to evaluate whether all hatchery programmes have actually increased net populations. To use these programmes more effectively, it is necessary to evaluate both their river- and species-specific benefits and compare hatchery programmes with other management tools, such as fishery controls and habitat rehabilitation. Future hatchery programmes should incorporate active, adaptive learning approaches to minimize the risks associated with artificial propagation and to promote sustainable salmon stocks.

Keywords: Oncorhynchus spp., population dynamics, sea ranching, stock enhancement

Received 29 August 2005; accepted 28 March 2006.


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