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Department of Biology Fisheries ecology and Aquaculture

Learn about the technical and biological challenges in the rearing of European hake, including spawning, larval rearing, and growth patterns. This research showcases successful captive broodstock development and offers valuable insights into the aquaculture industry.

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Department of Biology Fisheries ecology and Aquaculture

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  1. CHALLENGES IN THE REARING OF EUROPEAN HAKE MERLUCCIUS MERLUCCIUSAUDREY J. GEFFEN, ANNE-LAURE GROISON, LENE KLEPPE, University of Bergen, Norway. HÉLÈNE du PONTUAL, AURELIE JOLIVET, Ifremer, STH/LASAA, Brest, France. RAGNAR SALTE, MerluNor, Brekke / Norwegian University of Life Sciences, Ås, Norway. Department of Biology Fisheries ecology and Aquaculture

  2. Why Hake? – Good marketing opportunities Interesting biology Why in Norway? – Good technical foundation, Good access to local wild populations

  3. Short history of hake larval rearing 1997, 1998, 1999 - Reidun Bjelland and Anne Berit Skiftesvik (Institute for Marine Research– Austevoll Research Station) Bjelland & Skiftesvik 2006 2005 – Anne Laure Groison (Department of Biology, UiB) • Ragnar Salte (Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences) establishes MerluNOR and captive broodstock 2006 – Anne Laure Groison (UiB), Aurelie Jolivet and Hélène du Pontual (Ifremer, Brest) 2007 – Natural Spawning!!!! MerluNor and Ifremer • Aurelie Jolivet and Hélène du Pontual (Ifremer, Brest) • Audrey Geffen (UiB) 2008 – Natural Spawning at MerluNOR - UiB

  4. Status and challenges • One captive broodstock • One instance of successful rearing • Larval rearing until 25dph, past first feeding Technical Challenges Biological Challenges Photos: J. Skadal

  5. Technical Challenge -1 Eggs have been obtained by stripping wild-caught fish

  6. Captive spawning Captive populations established at Brest, France and at Brekke, Norway Egg production in both populations Fertilized eggs leading to larvae produced by Brekke group MerluNor – Brekke, Norway

  7. Photo: J. Skadal Egg production Captive spawning pattern compares well with field data Spawning first observed at Brest and at Brekke in 2007 2 Females at Brekke produced 17 batches in 2007, 3 batches so far in 2008

  8. Photo: J. Skadal Technical Challenge -2

  9. Photo: J. Skadal Biological Challenges – 1: Growth Pattern Hatching – Day 0

  10. Biological Problems – 2: Establishment of feeding 3 Dph 12 Dph 10 Dph 19 Dph Photos: J. Skadal

  11. Challenges? Broodstock, Incubation Rearing conditions: light levels Feeding: Prey size, swimming behaviour Coombs & Mitchell, 1982 Light levels In tanks ~ 2-5 µmol s-1 m-2 At surface 8 - 15 µmol s-1 m-2

  12. Thanks!

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