Improving survival of spring Chinook hatchery smolts in the Willamette River, Federal Aid Progress Reports Fisheries 1978

Identification Information

Citation

Originator: Smith, E.M., R.H. Williams, and J.C. Zakel

Publish Date: 1979

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Cedric Cooney

Job Position: Natural Resources Data and Systems Manager

Telephone: 503-947-6094

E-Mail Address: cedric.x.cooney@odfw.oregon.gov

Description

Abstract: We released comparable groups of 1975 and 1976 brood spring chinook smolts at Foster Dam on the South Santiam River and below Willamette Falls to define the effects of fish size and time and location of releases of hatchery smolts on survival. The first tagged fish, seven 3-year-old jacks, returned to South Santiam Hatchery in 1978. They resulted from fall released smolts and included six jacks from the release at Foster Dam and one from the release below Willamette Falls. We compared growth, ATPase activity and scale characteristics of juveniles during residence in the hatcheries and at release with similar data collected post-release from active emigrants in the lower Willamette and Columbia rivers. Smolts smaller than about 140 mm do not appear to emigrate quickly. We could not relate ATPase activities to success of emigration, and we found several factors could influence activity. Emigration of spring chinook smolts released in the spring appear similar for 1975 and 1976 broods; movement peaked in the lower Willamette River about 3 wk post-release. We continued to collect adult return information from comparable groups of Carson and Willamette spring chinook returning to Fall Creek Dam. Carson chinook continued to predominate in the returns to the fish trap at Fall Creek, while preliminary fishery contribution estimates favored the Willamette stock.

Purpose:

Time Period of Content: October 1, 1977 to September 30, 1978

Geographic Extent: Willamette River

Status: Final

Use Constraints:

Format: PDF File

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Is a physical copy maintained for reference at Headquarters? Yes