[env-trinity] Willow Creek Downstream Migrant Trap 2009 Catch Summary

Bill_Pinnix@fws.gov Bill_Pinnix at fws.gov
Thu Apr 16 16:25:51 PDT 2009


Hello,

Here is the 2009 catch summary for the Willow Creek Downstream Migrant Trap
on the mainstem Trinity River. Please feel free to distribute. PDF file of
text and catch table are attached.

                  Willow Creek Downstream Migrant Trap Site
                2009 In-Season Trapping Update –April 16, 2009

   Synopsis: The 2009 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 12, 2009 with the
   installation of two traps.  A third trap was installed March 14, 2009.
   See attached catch summary for details of this narrative.

   This summary includes data from March 12th, 2009 through March 31st,
   2009 and is presented as raw catch.  No expansions have been calculated
   at this time. Data entry is not complete for Julian Weeks 13-15, April
   1st  to April 16th.  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.

   Raw daily catches of Chinook salmon (Oncorhynchus tshawytscha) have been
   captured each day sampling has occurred and most have been
   young-of-the-year (YOY), with  more age 1+ natural Chinook salmon than
   in past years.  Weekly mean Fulton’s K values of YOY Chinook salmon
   began the season lower than 1.0 with an increase in condition evident
   over the 3 weeks summarized.  Efficiency calibrations were conducted
   during this summary period with freeze-branded hatchery Chinook salmon
   on March 13, March 19, and March 26.

   Raw daily catches of steelhead (Oncorhynchus mykiss) smolts (age 1+)
   have been steady since the beginning of trapping with hatchery steelhead
   showing up in Julian Week 13.  Steelhead smolts captured JW 11-13 had
   weekly mean Fulton’s K values slightly higher than 1.0.  Steelhead YOY
   numbers are present in the catch, but have yet to show signs of a peak.

   Raw daily catches of coho salmon (Oncorhynchus kisutch) are low compared
   to the past 6 years, especially for natural smolts.  Weekly mean
   Fulton’s K value of natural coho salmon smolts have been higher than
   1.0.  Hatchery coho smolt catch occurred in the catch during Julian Week
   12.


   If you have any questions regarding this summary, don't hesitate to
   contact Bill Pinnix at (707) 822-7201.

   (See attached file: WCT_Catch_Summary_04_16_09.pdf)

William Pinnix
USFWS, AFWO
1655 Heindon Rd
Arcata, CA 95521
(707) 822-7201
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