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Evaluation of the relationship among time of ocean entry, physical and biological characteristics of the estuary and plume environment, and adult return rates, 2004
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2005
[PDF-6.20 MB]
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Description:This study examines the relationship between smolt-to-adult return rates (SARs) for spring Chinook salmon Oncorhynchus tshawytscha and the time of ocean entry in relation to physical and biological characteristics of the estuary and nearshore ocean plume environment. Study fish, originally from Willamette Hatchery, were transferred and reared by the Clatsop Economic Development Committee Fisheries Project and released in the lower Columbia River. In 2004, the project’s third year of releases, six groups of coded-wire tagged yearling spring Chinook salmon were transferred from Willamette Hatchery to net pens in Blind Slough in the Columbia River estuary, reared for 14 days and released at 10-day intervals (the last group reared for only 8 days) from 7 April through 20 May. Size and smolt development (gill Na+-K' ATPase activity) at release were similar among groups. Fungus and mortality increased in the net pens for the last two release groups due to warm water in Blind Slough during 2004.
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Rights Information:CC0 Public Domain
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