1 / 28

Salmon Stocking An International Point of View Ted Potter

40,000,000* eggs per year takenfrom wild salmon. *Based on ICES Working Group on North Atlantic salmon 2000. Salmon stocking in the North Atlantic. The aim of stocking is to make

salena
Download Presentation

Salmon Stocking An International Point of View Ted Potter

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Salmon Stocking – An International Point of View Ted Potter Colloquium on Atlantic salmon: “Atlantic Salmon: for Better Management of Habitats and Salmon-Farms for Restocking” 21-22 October 2009, Oloron-Stainte-Marie

    2. 40,000,000* eggs per year taken from wild salmon Salmon stocking in the North Atlantic

    3. Experiences of stocking in Europe

    4. Many reasons and methods Mitigation: Compensating for a problem that cannot be removed Restoration: Assisting the recovery of a stock after a problem has been removed Enhancement: Supplementing a stock when production is less than the potential Ranching: Releasing fish with the intention of catching the majority of the returns

    5. Some examples

    6. Restoration stocking

    7. Mitigation stocking

    8. Salmon rod catch

    9. Mitigation stocking

    10. Salmon rod catch

    11. Salmon rod catch

    12. What did stocking contribute?

    13. What caused the improvements?

    16. Few programmes have been well monitored Many studies fail to assess overall effectiveness and impacts

    17. Enhancement stocking Competition

    18. Predation !!

    20. Diseases and parasites

    21. Genetic effects Loss of local adaptations: Growth rate Age of smolting Smolt run timing Maturation age Adult run timing etc Loss of heterogeneity

    22. Is stocking effective? Survival of reared fish is higher in hatchery BUT lower after release So stocking can produce more fish IF habitat connectivity and quality are adequate But the benefits are often small

    23. Is stocking effective?

    24. What is the international advice? NASCO -Williamsburg Resolution

    25. NASCO advice All stocking activities should be regulated

    26. Address the problems habitat obstructions pollution fisheries etc

    27. Assess and minimise the risks: conduct health inspections seek expert genetic advice evaluate risks to the ecosystem minimise the effects of the hatchery rearing

    28. Monitor the results … contribution to catches contribution to spawning impacts on wild populations

    29. Merci

More Related