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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Bill_Pinnix@fws.gov
[mailto:Bill_Pinnix@fws.gov] <br>
<b>Sent:</b> Thursday, May 06, 2010 1:56 PM<br>
<b>Subject:</b> Trinity River In-Season Trapping Update -- Outmigrant
Monitoring at Willow Creek<o:p></o:p></span></p>
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<p align=center style='text-align:center'><span style='font-size:13.5pt'>Willow
Creek Downstream Migrant Trap Site</span><br>
<span style='font-size:13.5pt'>2010 In-Season Trapping Update –May 6, 2010</span><o:p></o:p></p>
<p class=MsoNormal><br>
<span style='font-size:13.5pt'>Synopsis: The 2010 Downstream Migrant trapping
season at the Willow Creek Trap Site (river kilometer 34) is being conducted
jointly by the USFWS Arcata Fish and Wildlife Office (AFWO) and the Yurok
Tribal Fisheries Program (YTFP) on the mainstem Trinity River near Willow Creek,
California. The season began March 8th, 2010 with the installation of two
traps. A third trap was installed March 9th, 2010. See attached catch summary
for details of this narrative.</span><br>
<br>
<span style='font-size:13.5pt'>This summary includes data from March 9th, 2010
through April 15th, 2010 and is presented as <b>raw catch</b>. No expansions
have been calculated at this time. Data entry is not complete for Julian Week
(JW) 16, April 16th to April 22nd. Heavy debris load and high flows have
occasionally resulted in null sets, causing less than 21 trap days (3 traps x 7
days) in some weeks (particularly weeks 13-15 when spring rains coincided with
high dam releases), resulting in variable effort over the season; therefore raw
catch numbers should be interpreted with caution. </span><br>
<br>
<span style='font-size:13.5pt'>Raw daily catches of Chinook salmon (<i>Oncorhynchus
tshawytscha</i>) have been captured each day sampling has occurred and most
have been young-of-the-year (YOY). Weekly mean Fulton’s K values of YOY Chinook
salmon were greater than 1.0 for all weeks sampled except JW 11. Efficiency
calibrations were conducted with freeze-branded hatchery Chinook salmon during
all weeks sampled. </span><br>
<br>
<span style='font-size:13.5pt'>Raw daily catches of steelhead (<i>Oncorhynchus
mykiss</i>) smolts (age 1+) have been relatively steady since the beginning of
trapping with hatchery steelhead showing up in JW 12. Weekly mean Fulton’s K
values of Steelhead smolts were greater than 1.0 for all weeks sampled except
JW 11 and JW 14. Steelhead YOY numbers are present in the catch, but have yet
to show signs of a peak. </span><br>
<br>
<span style='font-size:13.5pt'>Raw daily catches of coho salmon (<i>Oncorhynchus
kisutch</i>) are lower than last year at this time but not significantly lower
than other years prior. Weekly mean Fulton’s K value of natural coho salmon
smolts has varied greatly from week to week due to low catches. Hatchery Coho smolts
occurred in the catch beginning Julian Week 15. </span><br>
<br>
<span style='font-size:13.5pt'>If you have any questions regarding this
summary, don't hesitate to contact Bill Pinnix at (707) 822-7201.</span><br>
<br>
<i>(See attached file: WCT_Catch_Summary_05_06_10.pdf)</i><br>
<br>
<br>
William Pinnix<br>
USFWS, AFWO<br>
1655 Heindon Rd<br>
Arcata, CA 95521<br>
(707) 822-7201<o:p></o:p></p>
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