Abundance and Distribution of Walleye, Northern Squawfish and Smallmouth Bass in John Day Reservoir and Tailrace, 1984 Annual Report.

Technical Report · Sat Jun 01 04:00:00 EDT 1985

DOI:https://doi.org/10.2172/5379945· OSTI ID:5379945

Nigro, Anthony A; Faler, Michael P; Elliott, John C ^[1]

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1. Oregon Department of Fish and Wildlife, Columbia River Section, John Day, OR

Walleye, northern squawfish and smallmouth bass abundances were estimated in John Day Reservoir using a modified Schnabel multiple mark and recapture estimator. Sampling was conducted from March 25 to August 31 using gill nets, trap nets, boat electrofishing, angling and an angler survey. A total of 858 walleye, 4552 northern squawfish, and 1599 smallmouth bass were collected. Discrete populations were defined according to observed movements of recaptured and radiotagged fish. Abundance estimates were corrected for angler harvest, size selectivity of gear, tag loss and recruitment due to growth during sampling. In addition, the likelihood of biases resulting from differential mortality of marked fish was examined. Abundances in John Day pool of walleye and northern squawfish with fork lengths greater than 250 mm were estimated at 15,832 and 80,486. Abundances of smallmouth bass with fork lengths greater than 200 mm were estimated to be 2596 in lower John Day pool and 1791 in upper John Day pool. Walleye and northern squawfish moved throughout the pool, whereas movements by smallmouth bass were more localized. Angler harvests of walleye and smallmouth bass in upper John Day pool from April through August were estimated at 309 and 584 fish. Angler harvest of northern squawfish was negligible. Most walleye collected were age 5. The most abundant age groups of northern squawfish and smallmouth bass were 10 and 2. 10 refs., 28 figs., 12 tabs.

• Research Organization: Oregon Dept. of Fish and Wildlife, Portland (USA)
• Sponsoring Organization: United States. Bonneville Power Administration.
• OSTI ID: 5379945
• Report Number(s): DOE/BP-35097-2; ON: DE85016236
• Country of Publication: United States
• Language: English

Related Subjects

520500* -- Environment
Aquatic-- Site Resource & Use Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABUNDANCE
ANIMALS
AQUATIC ORGANISMS
BEHAVIOR
COLUMBIA RIVER
DATA
EXPERIMENTAL DATA
FEDERAL REGION X
FISHES
Fish populations - John Day Reservior (Or. and Wash.)
INFORMATION
NORTH AMERICA
NUMERICAL DATA
OREGON
POPULATIONS
RIVERS
STREAMS
SURFACE WATERS
USA
VERTEBRATES
WASHINGTON
WATER RESERVOIRS