A Study to Evaluate Delayed (Extra) Mortality Associated with Passage of Yearling Chinook Salmon Smolts through Snake River Dams Project No. 200304100.

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Presentation transcript:

A Study to Evaluate Delayed (Extra) Mortality Associated with Passage of Yearling Chinook Salmon Smolts through Snake River Dams Project No

STUDY OBJECTIVE Determine if passage through three Snake River dams and reservoirs results in extra mortality in yearling Chinook salmon smolts

EXPERIMENTAL DESIGN PIT Tag Study Groups at LGR Transport One Group for Release below IH Release Two Other Groups below LGR One Transported, One Not Transported Study Fish Those Detected at MCN Adult Returns Detected at BVL

STUDY TASKS Design and construct a new, state-of-the-art juvenile fish marking facility at Lower Granite Dam

STUDY TASKS Design and construct a new, state-of-the-art juvenile fish marking facility at Lower Granite Dam PIT tag sufficient numbers of yearling Chinook salmon to satisfy the study design in each of 3 years (301,000 fish per study year)

2005 Juvenile Tagging Tagged from 3 May to 19 May

2005 Juvenile Tagging Tagged from 3 May to 19 May Released 47,352 hatchery Chinook salmon* LGR (no transport)22,934 LGR (4 hour transport)13,506 ICH (4 hour transport)10,912 * On 7-8 May, heavy rains above Lower Granite Dam caused very high turbidity (chocolate-milk-like) in the Snake River which flushed nearly the entire second half of the smolt migration past the dam over a 2-5 day period.

2005 Juvenile Tagging Tagged from 3 May to 19 May Released 47,352 hatchery Chinook salmon LGR (no transport)22,934 LGR (4 hour transport)13,506 ICH (4 hour transport)10,912 Detections at McNary Dam LGR (no transport)6, % LGR (4 hour transport)3, % ICH (4 hour transport)3, %

STUDY TASKS Design and construct a new juvenile fish marking facility at Lower Granite Dam PIT tag sufficient numbers of yearling Chinook salmon to satisfy study design in each of 3 years (301,000 fish per study year) Recover adults during upstream passage at Bonneville Dam

STUDY TASKS Design and construct a new juvenile fish marking facility at Lower Granite Dam PIT tag sufficient numbers of yearling Chinook salmon to satisfy study design in each of 3 years (301,000 fish per study year) Recover adults during upstream passage at Bonneville Dam Report results

QUESTIONS?