Spatial distribution of juvenile salmonids in the Hanford reach, Columbia River
Journal Article
·
· Fishery Bulletin; (United States)
OSTI ID:5716394
- Pacific Northwest Lab., Richland, WA (United States)
The cross-sectional distribution of juvenile chinook salmon, sockeye salmon, and steelhead was determined in the Hanford Reach of the Columbia River from July to September 1983 and from April to July 1984. Fish were sampled with fyke nets from anchored barges, movable shoreline fyke nets, seines, and with electroshocking equipment. Fall chinook salmon from naturally spawning populations and from hatchery releases were the principal species collected in the spring. Zero-age fall chinook salmon occurred primarily in shoreline areas of reduced current velocity but were present throughout the river cross section during their early rearing and outmigration period. Hatchery-released fall chinook smolts were less abundant in nearshore areas than were wild fish. yearling spring chinook salmon, sockeye salmon, and steelhead smolts from upriver areas were collected mainly from the bottom, midchannel zone of the river. Principal downstream movement of all species occurred from 2200 to 0400 (PDT). Fish collections followed an activity pattern that included migration, feeding, and resting periods.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5716394
- Journal Information:
- Fishery Bulletin; (United States), Journal Name: Fishery Bulletin; (United States) Vol. 87:4; ISSN FSYBA; ISSN 0099-5487
- Country of Publication:
- United States
- Language:
- English
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