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U.S. GEOLOGICAL SURVEY
Open-File Report 2008-1022

Summary of Survival Data from Juvenile Coho Salmon in the Klamath River, Northern California, 2007

By John W. Beeman

Abstract

A study to estimate the effects of Iron Gate Dam discharge on ESA-listed juvenile coho salmon during their seaward migration to the ocean was begun in 2005. Estimates of survival through various reaches of river downstream from the dam were completed in 2006 and 2007 as part of this process. This report describes the estimates of survival during 2007, and is a complement to a similar report from 2006. Further analyses will be included in a separate report. In 2007, a series of models were evaluated to determine what survival and capture probabilities of radio-tagged hatchery fish were in several reaches between Iron Gate Hatchery at river kilometer 309 and a site at river kilometer 33. The results indicate trends in survival among reaches were similar to those found in 2006, but the survival in 2007 was lower than in 2006. The differences in survivals from Iron Gate Hatchery to river kilometer 33 in 2006 (0.653 SE 0.039) and 2007 (0.497 SE 0.044) were caused primarily by differences in survivals upstream from the Scott River. This document is a brief summary of 2007 survival results.

Contents

Abstract
Introduction
Survival of Juvenile Coho Salmon from Iron Gate Hatchery to Trees of Heaven
Survival of Juvenile Coho Salmon through River Reaches
Summary
Acknowledgments
References Cited

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Reader, it is available for free download from Adobe Systems Incorporated.

Download the report (PDF, 370 KB)

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Send questions or comments about this report to the author, J.W. Beeman, (509) 538-2299 x257.