Update on the status of Snake River Subyearling Chinook Migration Current Year Passage of PIT-tagged Snake Subs LGR PIT Detections LGR Estimated Passage.

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Presentation transcript:

Update on the status of Snake River Subyearling Chinook Migration Current Year Passage of PIT-tagged Snake Subs LGR PIT Detections LGR Estimated Passage Collection Efficiency Estimates 2005 and Historic Passage Index at LGR Historic Timing Wild PIT-tags

LGR PIT-tag Detection Summary

Collection Efficiency Calculations at LGR Compare Methods of Estimating Collection Efficiency/Population Expansion methods Cormack-Jolly-Seber FPCv1 and v2 memo method WPC memo spill expansion method

Methods used to calculate Collection Efficiency at LGR FPC Methods – CJS CE lgr = Number re-released at LGR Number of R 2 detected below LGR Number of R 1 not seen at LGR detected below LGR Number of R 1 detected at LGR

Methods used to calculate Collection Efficiency at LGR cont. FPC Methods – use LGS detects to estimate LGR CE (based on various methods) X 11 = PITs seen at LGR and LGS X 01 = PITs seen at LGS but not LGR F lgr = proportion of fish removed at LGR (trans, research) Project X 01 distribution based on X 11 travel time distribution at LGS (gamma dist) Calculate seasonal weighted CE (weight daily LGS PIT detections)

Methods used to calculate Collection Efficiency at LGR cont. WPC - spill expansion method Daily PIT Passage = X 1 = Daily PIT detects at LGR FGE lgr = 0.5 assumed FGE Seasonal Total PIT Passage sum of daily totals

Range of Total Snake River 15W PIT passage estimates from methods Method LGR CE Prior to June 20 LGR CE After June 20 Estimated total PIT passage R = 9302, LGR det = 1038 CJS ,858 (41%) FPC v ,351 (47%) FPC v ,723 (29%) WPC spill exp ,829 (52%)

Daily estimates of PIT-tag passage at LGR Snake River Wild Subs (15W)

Daily estimates of PIT-tag passage at LGR Clearwater River Wild Subs 13W

Historic average daily index at LGR compared to 2005 daily index

Historic Cumulative Passage Timing LGR CH0

Historic wild Snake River PIT-timing at LGR

Historic wild Clearwater River PIT-timing at LGR

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