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Historical Review

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Title: Historical Review Author: mdehart Last modified by: Deidre Wood Created Date: 10/15/2003 3:13:19 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: Historical Review


1
Historical Review
  • Fish Migration Data

2
Two Management Approaches Spill for Fish Passage
  • Planning dates
  • Percent passage dates

3
Planning Date Advantage
  • Certainty in planning and implementing hydro
    system operations
  • Eliminates controversy and conflict regarding
    spill management
  • Implemented within present data collection
    systems

4
Planning Date Disadvantage
  • Late migrating stocks receive less spill
    protection
  • Does not adjust to variability in passage
    distribution and timing
  • Does not incorporate travel time

5
Advantage of Fixed Percent Passage
  • Potential to extend protection to later migrating
    stocks which extend beyond the present planning
    dates
  • Potential economic benefit if percent passage
    date occurs prior to the present planning date

6
Disadvantage of Percent Passage Date
  • Uncertainty in planning, difficult to predict
  • Present data collection system does not support
    this management approach
  • Using run-at-large weights protection to hatchery
    releases
  • Present mark groups do not support this
    management approach

7
Present Sampling and Marking Do Not Support the
Percent Passage Approach
  • Mark groups do not represent the entire passage
    distribution
  • Marking constraints
  • Sampling constraints

8
Cont.
  • Requires more extensive marking of specific
    stocks to fully represent the migration
  • May require later end date of sampling
  • Additional PIT tag marking required of index
    groups

9
Using Run-at-large, Weights Protection to
Hatchery Releases
  • Run-at-large dates are determined by large
    production releases upstream of the project
  • Protection of upstream origin or weaker stocks
    is diminished at downstream sites

10
The Historic Data1985-2003
  • Run-at-large
  • Timing and distribution data is highly influenced
    by large hatchery releases
  • Present marking and monitoring does not allow the
    differentiation between hatchery and wild stocks
    in the run-at-large
  • Percentiles based upon the run-at-large timing do
    not accurately represent the wild passage
    distribution

11
Spring Migrants
  • For wild PIT tagged yearling chinook from the
    Salmon and Clearwater basins, the 10 year average
    95 detection date occurred after the June 20
    planned end of spring spill in the lower Snake
    River.
  • For Salmon River stocks in 6 out of the 10 years
    analyzed (1994-2003), 7 to 16 occurred after
    June 20.
  • For Clearwater wild yearling chinook in 9 of 10
    years, 6 to 23 of detections occurred after
    June 20.

12
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13
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14
Summer Migrants Snake RiverRun-at-large
  • The 1991-2003 average 95 passage date at Lower
    Granite was Sept. 3
  • The 1991-2003 average cumulative passage index
    that occurred after August 31 at Ice Harbor was
    11.6
  • The 95 passage date at Ice Harbor occurred after
    August 31 in 9 of 13 years (based on Lower
    Granite plus travel time)

15
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16
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17
Marked Snake Basin Subyearlings
  • In 7 of 13 years (1991-2003) greater than 5 of
    passage occurred at Ice Harbor after August 31,
    August 15 at Lower Granite Dam.
  • Marked subyearling chinook may not represent the
    wild run at large. In 5 of the 8 years of data
    (1991-1998) marked fish showed a much earlier
    passage date.

18
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19
Lower Columbia Summer Migrants
  • The 95 passage date of the summer migration at
    McNary is largely influenced by the present
    hatchery release schedules for Ringold and Priest
    Rapids (Aug. 6 19)
  • For the 1995-2001 wild Hanford reach groups which
    are PIT tagged in early June, 95 passage occurs
    on July 26. There is no tag data for the middle
    and late portion of this population.

20
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21
Mid-Columbia Summer Migrants
  • Unclipped subyearling chinook at Rock Island from
    1997-2003 average 95 passage date at McNary is
    Sept. 16
  • In 3 of 7 years of data 95 passage occurred at
    MCN (7-21) and BON (10-27) after August 31

22
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23
Percentage of annual PIT tag detections occurring
in August at McNary Dam for subyearling chinook
originating in the Snake R. and Mid-Columbia R.
basins
Year Snake River Basin Snake River Basin Snake River Basin Mid-columbia River Basin Mid-columbia River Basin Mid-columbia River Basin Mid-columbia River Basin
Year ClearwaterRiver () Snake River () Tucannon River () Yakima River () Hanford Reach () Rock Island Dam () Wells Hatchery ()
1998 28.6 18.7 1.2 3.3 0.0 53.1 1.8
1999 (0 fish) 42.3 No tags 30.7 2.4 64.9 14.1
2000 (0 fish) 8.8 6.9 2.9 16.3 64.0 20.3
2001 (0 fish) 33.4 33.3 0.0 17.2 71.7 37.7
2002 (0 fish) 12.7 2.0 No tags No tags 57.2 5.1
2003 (3 fish) 12.5 No tags No tags 0.0 28.6 1.0
24
Percentage of Subyearling Wild Chinook Migrants
Observed at John Day Dam During August
Year Yakima River Hanford Reach
1998 19.6 2.3
1999 20.0 9.2
2000 20.8 44.7
2001 4.5 66.7
25
General Impressions
  • Significant modifications are required to
    sampling programs to facilitate the percent
    passage management approach.
  • Expansion of mark groups are required for all
    species to support the percent passage approach.

26
Cont.
  • On average 95 passage date for subyearling
    chinook at Lower Granite Dam extends past the
    planning date.
  • By terminating spill at Ice Harbor on August 31,
    only the passage distribution through August 15
    at Lower Granite is provided spill protection.

27
Cont.
  • On average wild Mid-Columbia stocks extend beyond
    the planning date at McNary Dam.
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