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Factors Limiting Columbia Gorge Chum Salmon US Fish and Wildlife Service Columbia River Fisheries Program Office February 2002.

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Presentation on theme: "Factors Limiting Columbia Gorge Chum Salmon US Fish and Wildlife Service Columbia River Fisheries Program Office February 2002."— Presentation transcript:

1 Factors Limiting Columbia Gorge Chum Salmon US Fish and Wildlife Service Columbia River Fisheries Program Office February 2002

2 Chum had widest distribution of all Pacific salmon (~ 50% of annual biomass) Historic chum run in the early 1900s was ~1,400,000 By 1928, run size was ~700,000 adults In 1950s the run size had dropped to ~10,000 Since 1959, the population has been relatively stable with the annual minimum run size ranging from 300 to 5,700 Brief History

3 Adults

4 Hamilton Springs WeirHardy Creek Weir Spawning Ground SurveysRadio Telemetry

5 Date Live count and corresponding peak daily flow,

6 Typical male and female movement [50 m] [3600 m] [2000 m] Date

7 Hamilton Springs Hardy Creek Ives Island Pierce Island 3000m m 2

8 Juveniles

9 D-Frame Fyke Net Floating Fyke Net Bismark Brown Photonic Dye Injection

10 Smolt emigration timing, * * * Indicates Hamilton Springs data

11 Smolt abundance estimates in Hardy Creek and Hamilton Springs, * 203* 48* 50* 12* 26* * Indicates number of females in stream previous spawning season

12 Redd Caps

13 Habitat

14

15 Piezometers


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