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Stock Enhancement in Norway

Stock Enhancement in Norway. Experiences and activities in Norway and Europe, based on studies of the European lobster Homarus gammarus Gro I. van der Meeren , Halvor Knutsen , Jan Atle Knutsen , Ann- Lisbeth Agnalt and colleagues

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Stock Enhancement in Norway

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  1. Stock Enhancement in Norway Experiences and activities in Norway and Europe, based on studies of the European lobster Homarusgammarus Gro I. van derMeeren, HalvorKnutsen, Jan AtleKnutsen, Ann-LisbethAgnalt and colleagues Based on a presentation at RALBAM, Chennai, India 4-8 January 2010

  2. Lobster fisheries in Norway and Europe • Rebuilding the lobster stock • Stock enhancement • Release protocols • Carrying capacity • Habitat • Recapture • Life in the sea • Juvenile quality • Marine protected areas

  3. Releases at Kvitsøy 1990 - 1994 1500 1000 Catch (tons) 500 0 1920 1930 1940 1950 1960 1970 1980 1990 2000 Year Agnalt and Jørstad, 2002 Lobster fisheries in Norway

  4. Steps in Lobster Production Hatchery: Larval rearing Juvenile rearing Ongrowth Sea ranching: Transportation Release Recapture

  5. Juvenile rearing Hatchery Communal rearing Photo: Eva Farestveit, IMR Individual rearing Photo: K. Jørstad, IMR

  6. Growth Juvenile rearing Hatchery Communal rearing Single rearing Sea cages Experiments by: Knut Jørstad, et al. 2001 (communal and single rearing) G.I. van der Meeren, not published (sea cages)

  7. Juvenile rearing Hatchery From leaflet by Norsk Hummer A/S

  8. Juvenile rearing Hatchery ”Lobster house” to place in the sea Photo and patent rights: Aegir AS

  9. Juvenile rearing Hatchery Construction: Helge Knudsen, IMR Construction: Andreas Gjermundsen og Espen Eriksen, NTNU

  10. Release Release procedures From: Beard and Wickins 1992

  11. Releases in Europe, 1970-1995 Country Region Duration Years Numbers released Age at Age at Age at release Recapture Tot. Tot. % Years of Country Location Location research research # Released # Released release release # Recapt. # Recapt. Recap.% Recap.% France Up to 225 000 France France Bretagne Bretagne 10 10 2-3 weeks 2-3 weeks ? ? ? ? Weeks Ireland 292 000 Ireland Ireland Along coast Along coast 4 4 2-4 weeks 2-4 weeks ? ? ? ? France Gr.Britt. Gr.Britt. Gr.Britt. Gr.Britt. Norway 25 480 France France Bretagne 5 5 ~1 year ~1 year 22 22 0,09 0,09 Year 49 128 10 10 ~1 year ~1 year 653 653 1,3 1,3 East England 19 233 " " Wales 10 10 453 453 2,4 2,4 3 044 " " W. Scotland 9 9 ~1 year ~1 year 58 58 1,9 1,9 19 520 N. Scotland " " 9 9 ~1 year ~1 year 307 307 1,6 1,6 7 950 Norway Norway 9 9 ~1 year 5 115 5 115 4 Kvitsøy 127 945 ~1 year 6,2 10 Data: Ann-Lisbeth Agnalt, IMR

  12. Recaptures, Kvitsøy,Norway Recapture period reported by Agnalt et al. 1999 2,0 Male 88 Year Class Released: 15 000 Female Recaptured: 554 1,0 0,0 92 93 94 95 96 97 98 99 2000 2,0 89 Year Class Released: 8 700 Recaptured: 841 1,0 0,0 92 93 94 95 96 97 98 99 2000 2,0 90 Year Class Released: 29 700 Recaptured: 1 757 1,0 0,0 92 93 94 95 96 97 98 99 2000 Recapture (%) of each year class through time 2,0 91 Year Class Released: 29 900 Recpatured: 2 405 1,0 0,0 92 93 94 95 96 97 98 99 2000 2,0 92 Year Class Released: 11 800 1,0 Recaptured: 792 0,0 92 93 94 95 96 97 98 99 2000 2,0 93 Year Class Released: 32 800 1,0 Recaptured: 1 224 0,0 * * 92 93 94 95 96 97 98 99 2000 Recapture year (autumn and following spring) Data: Ann-Lisbeth Agnalt et al., IMR 2001

  13. Recaptures of annual clutches Kvitsøy, Norway 10 Release year 8 88 6 89 90 Cumulativ recapture 4 91 92 2 93 0 92-H 93-H 94-H 95-H 96-H 97-H 98-H 99-H Data: Ann-Lisbeth Agnalt et al., IMR 2000 Season

  14. Life in the sea CANO WP3 - Lobster Aim: Estimate carrying capacity (juvenile density) in early stages, in releases with European lobster (enhancement/ranching) Ann-Lisbeth Agnalt, Eva Farestveit, K.E. Jørstad

  15. Life in the sea Artificialshelters Hartvig Christie, NIVA

  16. Life in the sea Artificial reefs in Sweden N. Egriell, M. Ulmestrand, J. Andersson, B. Gustafsson, T. Lundälv, C. Erlandsson, L. Jonsson, T. Ahsberg Municipalauthorities og Gothenburg, Swedishshiptraficauthorities, GothenburgUniversity, Directorateof Fisheries EU

  17. Juvenile quality • Genetics • Anatomy • Neurology • Fitness • Behaviour

  18. Juvenile quality Genetics Jørstad et al., 2005

  19. Juvenile quality Morphology van der Meeren & Uksnøy 2000

  20. LPZ 56 m Juvenile quality Neurology Lobster brain BrdU-labelled lobster brain van der Meeren et al, in prep

  21. Juvenile quality Neurogenesis and growth in cultivated lobster juveniles Neurology van der Meeren et al, in prep

  22. Juvenile quality Fitness Photo: Eva Farestveit, IMR Photo: K. Jørstad, IMR Jørstad, et al. 2009

  23. Juvenile quality Behaviour Photo: T. van der Meeren

  24. Life in the sea From video by Eva Farestveit, IMR

  25. Thankyou

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