Population-specific aggregations of steelhead trout (Oncorhynchus mykiss) in the North Pacific Ocean

Autor:	Jerome J. Pella, Michael L. Dahlberg, Skip McKinnell
Rok vydání:	1997
Předmět:	biology Pelagic zone Aquatic Science biology.organism_classification Spatial distribution Pacific ocean Hatchery Fishery Trout Geography Population specific Rainbow trout Ecology Evolution Behavior and Systematics Salmonidae
Zdroj:	Canadian Journal of Fisheries and Aquatic Sciences. 54:2368-2376
ISSN:	1205-7533 0706-652X
DOI:	10.1139/f97-143
Popis:	The distribution of North American hatchery-origin steelhead (Oncorhynchus mykiss) in the North Pacific Ocean varied by age and hatchery location. Columbia River steelhead were more abundant south of the Aleutian Islands at an earlier age than steelhead from the Georgia Basin (Georgia Strait, Puget Sound, and waters connecting with the open Pacific). Between 1984 and 1989, there were eight independent and coincident recoveries of coded-wire-tagged steelhead, where individuals released from hatcheries as juveniles at similar times and locations were recovered together on the high seas up to 3 years later. A statistical test was developed to determine whether these coincident recoveries should be expected if individual steelhead within populations travelled in the North Pacific in an uncoordinated manner. The overall test suggested that some tagged steelhead populations travelled together in a significantly (P < 0.05) coordinated manner on the high seas.
Databáze:	OpenAIRE
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