OASIS - Lower Columbia River Coho Status Report 2002 – 2004: Population abundance, distribution, run timing, and hatchery influence.

Identification Information

Citation

Originator: Suring, Erik J., Eric T. Brown, and Kelly M.S. Moore

Publish Date: January 2006

Online Link: http://nrimp.dfw.state.or.us/crl/Reports/OASIS/LCReport02-04.pdf

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Eric T. Brown

Job Position: Project Leader

Telephone: 541-757-4263 x281

E-Mail Address: eric.brown@oregonstate.edu

Description

Abstract: This report provides an assessment of abundance, distribution, spawn timing, and hatchery:wild ratios of spawning adult coho salmon (Oncorhynchus kisutch) based on EMAP spawning surveys in the Oregon portion of the Lower Columbia River in the 2002, 2003, and 2004 spawning seasons. The Oregon portion of the Lower Columbia River Evolutionarily Significant Unit (ESU) extends from the mouth of the Columbia River to the Hood River, excluding areas above Willamette Falls. Analysis is conducted at the population complex level, six subsets of the ESU defined during Oregon Department of Fish and Wildlife Status Review (Chilcote 1999). Population characteristics, most notably the proportion of wild spawners and spawn timing, vary among complexes. Interannual variation within complexes over the last three years is linked to streamflow variation. Most hatchery straying occurred within complex, though the Bonneville complex received strays from further upriver. Abundance increased in areas without evidence of hatchery inputs. Abundance goals established by the ODFW endangered species management plan (Chilcote 2001) in the Clackamas (>1900 adults) and Sandy (>670 adults) have been met the last two years; however, spawner densities and the proportion of wild spawners are lower than on the Oregon Coast.

Purpose:

Time Period of Content: 2002-2005

Geographic Extent: Lower Columbia to Hood River - Astoria, Clatskanie, Scappoose, Clackamas, Sandy

Status: Final

Use Constraints:

Format: PDF File

Data Quality Information

Lineage-Source:

Data Information

No data information was supplied.

Entity and Attribute Information

Attributes Description: Field attribute information is available in the attached file(s).

Is a physical copy maintained for reference at Headquarters? Yes