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Report on Okanagan Lake Status of Fish Stocks and Recovery Strategies By Steve Matthews Senior Fisheries Biologist Ministry of Water, Land and Air Protection, Penticton. Presentation Outline. Okanagan Lake Background Information Impacts to Fish Populations Kokanee Stock Status Summary

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  1. Report on Okanagan Lake Status of Fish Stocks and Recovery StrategiesBySteve MatthewsSenior Fisheries BiologistMinistry of Water, Land and Air Protection, Penticton

  2. Presentation Outline • Okanagan Lake Background Information • Impacts to Fish Populations • Kokanee Stock Status Summary • Okanagan Lake Kokanee Recovery Plan Progress Report • Future Directions

  3. Site Description

  4. 18 species of fish Indigenous species include rainbow trout and kokanee Large number of introduced species Fish Species

  5. Major Impacts on Okanagan Lake Kokanee Populations • Habitat Loss • Low In-lake Survival

  6. Habitat Loss • 90% of salmonid stream habitat lost due to land development activites including agriculture, logging and urbanization

  7. Low In-Lake Survival • Lake level fluctuations • Competition with Mysis relicta • Nitrogen:Phosphorus Imbalance

  8. Severely depressed population Keystone species - indicator of health of ecosystem Many species reliant on kokanee as prey Kokanee

  9. Recent review by Cederholm et al. (2000) identified 137 species of birds, mammals, amphibians and reptiles as predators/scavengers of salmonids

  10. Okanagan Lake Kokanee Shore and Stream Spawner Estimates

  11. Estimates of Okanagan Lake Kokanee Population from Hydroacoustic Surveys

  12. All activities directed by the Okanagan Lake Action Plan developed in 1995 Comprehensive 20 year plan Considerable stakeholder input Currently delivering Year 8 of 10 year HCTF funding commitment 5 primary areas of focus Kokanee Recovery Strategies

  13. Regulatory controls on development Flows for fish Stream restoration Habitat Protection / Restoration

  14. Harvesting experiments Market analysis Bycatch investigations Test Fishery Modeling Mysis relicta RemovalCommercial Fishery Feasibility Studies

  15. Assessing feasibility of nitrogen enrichment Adaptive management approach small incremental steps reversible impacts Extensive consultative process Nutrient Investigations

  16. Improved Lake Level Management • Working at maximizing fish production within flood control and social constraints • Providing better tools to water managers

  17. Long Term Monitoring • Limnology • physical conditions • water chemistry • phyto/zooplankton • mysis • Kokanee stock status • in-lake population estimates • spawner enumerations • length/age information • genetics

  18. Okanagan Lake Action PlanFuture Direction - Primary Focus • Long term monitoring • Habitat protection / restoration • Mysis relicta large-scale removal • Improved lake level management • N:P ratio adjustment feasibility investigations • Recreational fishery management plan • Communications

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