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An introduction of Stock Enhancement in Kanagawa, Japan

An introduction of Stock Enhancement in Kanagawa, Japan. Provincial Court, Bruges , Belgium 7-8 May ,2007. Toshitame IMAI Kanagawa Prefectural Fisheries Technology Center Yoroshi, Jogashima, Misaki, Miura Kanagawa 238-0237, Japan

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An introduction of Stock Enhancement in Kanagawa, Japan

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  1. An introduction of Stock Enhancement in Kanagawa, Japan Provincial Court, Bruges , Belgium 7-8 May ,2007 Toshitame IMAI Kanagawa Prefectural Fisheries Technology Center Yoroshi, Jogashima, Misaki, Miura Kanagawa 238-0237, Japan Email: imai.6p2p@pref.kanagawa.jp

  2. A location of Kanagawa

  3. Landings of commercialand sports fishing in Kanagawa Total landing of fisheries Ratio of each fish species in total landing

  4. Brief Historyof Stock Enhancement Activities in Kanagawa Prefecture • Establishment of R/D facility of hatchery technology • R/D of live feed culture & larviculture 1974～Fundamental studies on fishery biology of the red sea bream, the Japanese flounder, and abalone 1975 Development of the technologies on mass production of live feed and a mechanical bottom cleaner 1976 The 1st hatchery for stock enhancement 1975- R/D of large scale larviculture technologies 1977 （Rotifer fortification examination, water tank bottom vacuum cleaner device development) 1978～ Large scale restocking activity of red sea bream using 1million hatchery-raised juveniles, tagged 10% juveniles 1986 Tag and recapture experiment on hatchery-raised red sea bream juveniles

  5. Brief Historyof Stock Enhancement Activities in Kanagawa Prefecture, contn’d 1984 Enforcement of the 1st basic plan for stock enhancement （The5th plan, 2006) 1987 A pilot proof examination (recovery ratio, cost- effectiveness, benefit principle ratio) 1989 An association of Kanagawa Fish Farming Foundation established • Investigation of measures on the management of stock enhancement of marine resources ( setting an closed fishing area, season, releasing a small fish) 1990 Construction of the 2nd hatchery for stock enhancement 2000 Introducing a benefitprinciple system

  6. A promotion system of sea farming Organization of Fish farming found Support Kanagawa Pref. Fish. Tec. Center Assoc. Kanagawa Fish farming Found. Inspector Board of director Caput City Town Secretariat Coop. Play fishing Boat supplier Angler Support Member. Operation sec. Fishermen Management sec.

  7. An aerial photograph of Kanagawa Prefectural Fisheries Technology Center

  8. Cultivation Tank of Rotifer and Green Water

  9. Rearing Tank and Drain Cage, Bottom Cleaner

  10. Development of Red Sea bream

  11. Releasing Hatchery Raised Red Sea Bream

  12. A Sports Fishing Boat of Red Sea Bream in Tokyo Bay

  13. Landing sight on Fish market

  14. Measurement of red sea bream

  15. Targetspecies ofstock enhancement in Kanagawa Prefecture Red: Association production Yellow: purchase from outside Black: Technology Center production Blue: Discontinue

  16. Annual changes of stocking number

  17. Recapture rate of stock enhancement

  18. Cost-effectiveness

  19. The catch by commercial and sports fishermen and the number of released juveniles of red sea bream in Kanagawa Prefecture. ‘00 ‘57 ‘66 ’78

  20. A ratio of hatchery-raised fish and wild fish in landing Thousand indi. Hatchery wild

  21. Development of a tagging method for a fry • We attached an anchor tag to red sea bream fry with length 6-8cm since 1978 to 1989 and released 1,000,000 of them in total. • The recapture rate was 1%. • Movement, growth became clear by anchor tag planting of fish. • However, a calculation of a recovery was not possible by falling off of a tag, and lacking of a recapture report.

  22. Development of a marking method for a fry • Furthermore, we developed a new technology using ALC as a mark to a fry, and to dye a scale. A method to make a mark in alizalin complexone stained an otolith conventionally Opticalmicroscope Fluorescent microscope

  23. The deformity of inter-nostril epidermis as a mark of hatchery-raised fish

  24. A contribution breakdown of an endowment A sum of an endowment 761,170 thousand yen

  25. A change of an income breakdown of Association of Kanagawa fish farming Foundation Thousand yen

  26. The ratio of seeds production capital before and after inducing cooperate money from the red sea bream fishing angler 1999 2005 20674000 Total \29,290,143 Total \32,100,000 Before After After

  27. Development of Zostera bed • Shallow waters of Tokyo Bay had very large eelgrass ground until 1960’s. • However, reclaim advanced for high economic growth after 1960’s, and shallow waters level lost it. • As a result, the seat which larvae of fishery products brought up disappeared, and quantity of fishery decreased sharply. • Therefore we perform a trial to restore eelgrass ground

  28. The genetic selection of stocks used for restocking purposes • In addition ,we pay it around 20% for the parent in every year and perform a substitute • We coast the number of parent fish more than 500 of them to keep genetic variety • We monitor mt-DNA and microsatellite DNA about a gene of a released fish and a fishery fish now. Haprotype composition

  29. Thank you very much for your kind attention

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