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Taneum Creek Coho/NTT Interactions Gabriel Temple.

Published byClaud Giles Greer Modified over 8 years ago

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Presentation on theme: "Taneum Creek Coho/NTT Interactions Gabriel Temple."— Presentation transcript:

1 Taneum Creek Coho/NTT Interactions Gabriel Temple

2 Domestication

3 Objectives Natural Production Is Taneum Creek a good place for Coho? Is Taneum Creek a good place for Coho? Ecological Interactions How will trout respond to naturally produced coho? How will trout respond to naturally produced coho? Will increased coho natural production have any negative effects on resident trout (growth or abundance) or will the nutrient benefits from stocking (carcasses) outweigh any potential negatives? Will increased coho natural production have any negative effects on resident trout (growth or abundance) or will the nutrient benefits from stocking (carcasses) outweigh any potential negatives?

4 Possible Outcomes Combined biomass may increase with the addition of coho Combined biomass may increase with the addition of coho Combined biomass may remain the same if coho biomass replaces trout biomass Combined biomass may remain the same if coho biomass replaces trout biomass Combined biomass may decrease if trout biomass is decreased as a result of coho introduction and coho are less efficient at utilizing resources Combined biomass may decrease if trout biomass is decreased as a result of coho introduction and coho are less efficient at utilizing resources

5 Coho Stocking

6 Annual Redd Distribution

7 Natural Production

8 PIT Tagged Smolts Fall 2008- PIT tagged 1300 Taneum coho Fall 2008- PIT tagged 1300 Taneum coho Fall 2009- PIT tagged 1870 Taneum coho Fall 2009- PIT tagged 1870 Taneum coho

9 Ecological Interactions Track changes in RBT abundance and biomass - BACI Track changes in RBT abundance and biomass - BACI Monitor growth of PIT tagged RBT in areas with and without coho production Monitor growth of PIT tagged RBT in areas with and without coho production Track changes in total combined biomass of salmonids - Ecological Efficiency Track changes in total combined biomass of salmonids - Ecological Efficiency Determine utilization of carcass material Determine utilization of carcass material

10 Resident Trout Data - BACI Abundance Biomass

11 Trout Instantaneous Growth

12 Biomass

13 Nutrient Benefit of Stocking

14 Causation Theoretical – assume we found a significant increase in growth in the treatment sites

15 Preliminary Results No detectable change to NTT abundance, growth or biomass after 2 years of coho natural production. No detectable change to NTT abundance, growth or biomass after 2 years of coho natural production. Increase in combined biomass although RBT biomass has been decreasing in treatments relative to controls. Increase in combined biomass although RBT biomass has been decreasing in treatments relative to controls. Will need several years of data to determine causation if an impact is determined. Will need several years of data to determine causation if an impact is determined.

16 Acknowledgements Bonneville Power Administration Bonneville Power Administration Todd Newsome and crew Todd Newsome and crew Tim Webster and crew Tim Webster and crew Anyone else I missed Anyone else I missed

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