Coastal Movements of Adult Fraser River Sockeye Salmon (Oncorhynchus nerka) Observed by Ultrasonic Tracking
作者:
A.B. Stasko,
R.M. Horrall,
A.D. Hasler,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1976)
卷期:
Volume 105,
issue 1
页码: 64-71
ISSN:0002-8487
年代: 1976
DOI:10.1577/1548-8659(1976)105<64:CMOAFR>2.0.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Forty-three adult sockeye salmon (Oncorhynchus nerka) fitted with ultrasonic transmitters were tracked in coastal waters near the Fraser River in July and August, 1967 and 1968. Movement patterns of individual fish were unpredictable. Some moved actively in appropriate directions, some drifted passively, still others travelled southward away from their presnmed destination. Fish released in pairs did not travel along similar paths. Active fish moved generally northward toward the Fraser River, keeping away from shore and following axes of tidal currents. There was little straying into bays and channnels with slow currents. Some fish remained active both during the day and at night, while others became inactive after sunset or when the sun was not visible behind clouds. Average ground speed was about 1 body length/s (61 cm/s). Orientation to geoelectric fields is postulated, along with a compass-related orientation northward.
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