Assessment of Oregon Coastal Adult Winter Steelhead – Redd Surveys 2008, OPSW-ODFW-2008-09

Identification Information

Citation

Originator: Suring, E., E. Brown and M. Lewis

Publish Date: July 2009

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). In 2008 the project was modified to assess status only at the DPS level. A spatially balanced probabilistic sampling design (Stevens 2002) was used to select survey sites across a stream network of winter steelhead spawning habitat. The selection frame was developed using best professional knowledge of biologists from a variety of private and governmental organizations. 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 2008). 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 2008. Sufficient surveys were conducted to meet precision estimates for populations within both the Oregon Coast and Klamath Mountains Province. Winter steelhead redd estimates for the 2008 spawning year were comparable to prior years for each of these distinct population segments. Regional patterns are apparent for redd density, hatchery independence, and spawn timing.

Time Period of Content:

Geographic Extent: Oregon Coast DPS and Klamath Mountains Province DPS

Status: Final

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

Format: PDF File

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

Is a physical copy maintained for reference at Headquarters? No