[env-trinity] Willow Creek Downstream Migrant Trap Site 2007 In-Season Trapping Update
Bill_Pinnix at fws.gov
Mon Apr 9 16:20:09 PDT 2007
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
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.
1655 Heindon Rd
Arcata, CA 95521
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