Analysis of Factors Potentially Inflating the Marine Survival Estimate of Coho Salmon (Oncorhynchus kisutch) at Mill Creek, Yaquina River, Central Oregon Coast, Information Reports 2006-02

Identification Information

Citation

Originator: Ray R., Johnson S.

Publish Date: July 2006

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: Scale and otolith analyses were used to determine if high marine survival estimates observed for coho salmon at an Oregon Department of Fish and Wildlife Life Cycle Monitoring Project site are inflated by 1) adult coho that reared as juveniles in other tributaries straying to the site, or 2) coho dispersing out of the site as fry, rearing in nearby salt marsh habitat, then returning to the site to contribute to the adult population. Scale analysis indicated that adult straying from other tributaries in the basin was unlikely to be contributing to the high marine survival estimate at the site. Scale analysis also indicated no evidence that coho fry rearing in nearby salt marshes were smolting as age-0+ fish and returning to contribute to the adult spawner population. Analyses of otolith strontium profiles were unable to distinguish differences in habitat use for fish reared in freshwater and marsh habitat because of aberrantly high ambient strontium to calcium abundance in the freshwater environment. Therefore the method was unsuitable for determining if coho fry rearing in nearby salt marshes were smolting as age-1+ fish and returning to contribute to the adult spawner population.

Purpose:

Time Period of Content:

Geographic Extent: Oregon

Status: Final

Use Constraints:

Format: Physical Document

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