[env-trinity] Willow Creek Downstream Migrant Trap Site 2007 In-Season Trapping Update

[Bill_Pinnix at fws.gov]

To Whom it May Concern:

                  Willow Creek Downstream Migrant Trap Site
                2007 In-Season Trapping Update –April 9, 2007

   Synopsis: The 2007 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 site utilizes multiple eight foot diameter
   rotary screw traps.  The season began March 5, 2007 with the
   installation of one trap.  A second trap was installed March 15, 2007,
   and a third trap was installed April 4th, 2007.

   This summary includes data from March 6th, 2007 through April 4th, 2007
   and is presented as raw catch.  No expansions have been calculated at
   this time.

   Raw daily catches of Chinook salmon (Oncorhynchus tshawytscha) have been
   captured each day sampling has occurred.  Most Chinook salmon captured
   during this time period have been young-of-the-year, and appear to be in
   good condition. Weekly mean Fulton’s K values of young-of-the-year
   Chinook salmon are near 1.0.

   Raw daily catches of steelhead (Oncorhynchus mykiss) smolts are low (see
   attached catch table), but present in the catch.  Steelhead
   young-of-the-year have been starting to show up in daily catches.  All
   steelhead smolts captured appear to be in good condition with weekly
   mean Fulton’s K values slightly higher than 1.0.

   Raw daily catches of coho salmon (Oncorhynchus kisutch) are low (see
   attached catch table), but present in the catch. Coho salmon smolt catch
   indicates a possible peak in Julian Week 12 (March 19-25). Weekly mean
   Fulton’s K value of natural coho salmon smolts are higher than 1.0,
   indicating good condition.  All coho salmon young-of-the-year appear to
   be in good condition with weekly mean Fulton’s K values near 1.0.

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



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