Accuracy of Using Scales to Age Mixed-Stock Chinook Salmon of Hatchery Origin

Autor:	Shayne E. MacLellan, Richard E. McNicol
Rok vydání:	2010
Předmět:	Fishery Chinook wind Geography biology Oncorhynchus Aquatic Science Life history biology.organism_classification Test sample Ecology Evolution Behavior and Systematics Hatchery Stock (geology) Aquatic organisms
Zdroj:	Transactions of the American Fisheries Society. 139:727-734
ISSN:	1548-8659 0002-8487
Popis:	Despite a long history of using scales to age Pacific salmon, there have been few attempts to validate scale-derived ages. This is particularly true for Chinook salmon Oncorhynchus tshawytscha, a species exhibiting a wide range of life histories across stocks. This has led to continuing questions regarding the accuracy of scale-based age determination for Chinook salmon. This study assessed the accuracy of Chinook salmon scale age data produced by multiple readers from multiple agencies, who aged hatchery fish of known age from mixed-stock, nonterminal fisheries conducted along the Pacific coast of Canada from 1991 to 2003. The test sample consisted of scales from 434 fish from both stream- and ocean-type stocks marked with coded wire tags (i.e., fish origin and total age were known). Sample stocks originated from Oregon, Washington, and British Columbia. Five readers from three federal or state Pacific Northwest fisheries agencies participated in the study. The readers possessed various levels o...
Databáze:	OpenAIRE
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