Annual report, Klamath River fisheries assessment program : juvenile salmonid trapping on the mainstem Trinity River at Willow Creek and on the Klamath River at Big Bar, 1990

Craig, James L.

ABSTRACT This report details the third year of Klamath River basin juvenile salmonid fishery investigations and represents the second year of sampling with rotary screw traps. Two traps, positioned side to side, were used at both the Klamath and Trinity River sites. The traps on the Klamath River were located at Big Bar (rkm 81) and began operation in March. The traps operated until July 10 and 18 sampling 38 and 31 nights respectively. Combined catch included 333 chinook (Oncorhynchus tshawytscha) , 178 steelhead (O^ mykiss) , and 30 coho (O^ kisutch) . No appreciable difference in mean catch or mean fork length of catch between the two traps was found. Peak weekly chinook catch effort, as an indicator of peak emigration, occurred the week of June 18 to 24. A total of five (1.5%) Ad-clip chinook were captured. A contribution of 134 (40%) hatchery chinook and 199 (60%) natural stock chinook was estimated for the total chinook captured. Mean migration rate for IGH Ad-clip chinook was 5.
"September, 1992."; "Report no. AFF-1-FRO-92-13."; "Funded in part by Trinity River Task Force, Klamath River Basin Fisheries Task Force."

Title

Annual report, Klamath River fisheries assessment program : juvenile salmonid trapping on the mainstem Trinity River at Willow Creek and on the Klamath River at Big Bar, 1990

Creator

Craig, James L.

Contributor

U.S. Fish and Wildlife Service. Coastal California Fishery Resource Office

Variant Title

Klamath River fisheries assessment program

Source

Originally published as: Annual report, Klamath River fisheries assessment program : juvenile salmonid trapping on the mainstem Trinity River at Willow Creek and on the Klamath River at Big Bar, 1990 (Arcata, CA : U.S. Fish and Wildlife Service, Coastal California Fishery Resource Office, 1992)
Digital reproduction of: Annual report, Klamath River fisheries assessment program : juvenile salmonid trapping on the mainstem Trinity River at Willow Creek and on the Klamath River at Big Bar, 1990 (Arcata, CA : U.S. Fish and Wildlife Service, Coastal California Fishery Resource Office, 1992)

Date Original

1992

Date Digitized

2005-04-20

Date Available

2005-04-25

Other Identifiers

local: OIT-20-Apr-2005-686

Subject (Topic)

Salmon -- Klamath River (Oregon and California)
Fish populations -- Klamath River (Oregon and California)
Salmonidae -- Klamath River (Oregon and California)

Format

text