annual stock assessment – coded wire tag program (odfw & wdfw) bpa project numbers: 198201302...
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![Page 1: Annual Stock Assessment – Coded Wire Tag Program (ODFW & WDFW) BPA Project Numbers: 198201302 and 198201304](https://reader035.vdocument.in/reader035/viewer/2022062511/5514e9ab550346935c8b5a52/html5/thumbnails/1.jpg)
Annual Stock Assessment – Coded Wire Tag Program
(ODFW & WDFW)
BPA Project Numbers:198201302 and 198201304
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Project DescriptionApply coded-wire tags to production releases of coho and chinook salmon
at WDFW and ODFW Columbia Basin hatcheries for stock assessment of hatchery and wild salmon populations.
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Proposed Tagging Locations for 2007
Tagged Chinook and Coho at 6 WDFW and 10 ODFW hatcheries.
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Project PurposePost-release Monitoring Tool for Hatchery fish
• Mitigation Hatchery Effectiveness• Smolt to Adult Survival
Basin-wide Coded Wire Tag Data Application
• Monitor ESA Fishery Impacts• Run Size Forecasts•Abundance of Wild Fish on Spawning Grounds•Identify Straying of Hatchery Fish•Harvest Estimates by Stock•Age Composition and Size at Age
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Project ResultsApply Coded Wire Tags (ODFW & WDFW)
• From 2003 to 2005 about 7.5 million fish tagged• Average 2.5 million per year
Recover Tags from Adult Fish (ODFW & WDFW)
• From 2002 to 2004 over 35,000 tags recovered• Average about 12,000 tags per year
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Percent of Production Releases Represented by a Coded-Wire Tag Group
40%
50%
60%
70%
80%
90%
100%
110%
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003Brood Year
Per
cen
t of P
rod
uct
ion
Ass
oci
ated
with
a C
WT
CHFCHSCohoTotal
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Average Observed Recoveries/Tagcode
0
100
200
300
400
500
600
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004Final Return Year
Ob
se
rve
d R
ec
ov
erie
s/T
ag
co
de
CHFCHS
Coho
Goal is 30 Observed
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Future Needs
• Statistical Review
• Wild Fish Tagging
• Basin Wide Monitoring Program