Assessment of Oregon Coastal Adult Winter Steelhead – Redd Surveys 2007, OPSW-ODFW-2007-09

Identification Information

Citation

Originator: Suring, E. and M. Lewis

Publish Date: June 2008

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Matt Weeber

Job Position: OASIS Program Analyst

Telephone: 541-757-5120

E-Mail Address: Matt.Weeber@oregonstate.edu

Description

Abstract: As part of the Oregon Plan for Salmon and Watersheds, the Oregon Department of Fish and Wildlife (ODFW) initiated a project to monitor spawning winter steelhead (Oncorhynchus mykiss) in coastal Oregon streams in 2003. This project is designed to assess the yearly status and trend, presence of hatchery fish, and distribution of winter steelhead spawners in six coastal Monitoring Areas (MA) in two Distinct Population Segments (DPS) (Figure 1). A spatially balanced probabilistic sampling design (Stevens 2002) was used to select survey sites across a stream network of winter steelhead spawning habitat. Monitoring of winter steelhead abundance is based on counts of redds instead of live or dead fish, in accordance with prior work conducted by ODFW in Oregon coastal streams (Susac and Jacobs 1999). Repeat visits to each site from February through May generated a total redd count for each survey. Redds were marked with colored rocks and flagging to prevent re-counting, during subsequent surveys. The survey interval of once every fourteen days is based on prior research (Susac and Jacobs 1999). Specific descriptions of project protocols can be found in the annual survey procedures manual (ODFW 2007). More information on methods and study background is available in Suring (In Prep.).

Purpose: This report provides a summary of results from winter steelhead spawning ground surveys conducted along the Oregon coast in 2007. Sufficient surveys were conducted to meet precision estimates at the monitoring area level within the Oregon Coast DPS and at the DPS level in the Klamath Mountains Province DPS. Winter steelhead redd estimates for the 2007 spawning year were comparable to prior years for the two distinct population segments of coastal Oregon winter steelhead. Regional patterns are apparent for redd density, hatchery independence, and spawn timing.

Time Period of Content: 1939-2006

Geographic Extent: Oregon Coast DPS and Klamath Mountains Province DPS

Status: Final

Use Constraints: Citation: Suring E. and M. Lewis. 2008. Assessment of Oregon Coastal Adult Winter Steelhead – Redd Surveys 2007. Monitoring Program Report Number OPSW-ODFW-2007-09. Oregon Department of Fish and Wildlife, Salem, Oregon.

Format: PDF File

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Is a physical copy maintained for reference at Headquarters? No