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Why Two Ecotypes? Tendency is inherited Physiological Capability to Switch Variable Environment Changes Advantage

Project Objectives

Examples of Resident Rainbow Streams within the Anadromous Fish Zones

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Yakima River Temperatures

Rainbow And Steelhead Intermix And Produce Both Types

Focal Point Depth and Velocity. From Everest and Chapman 1972

Depth Suitability for O. mykiss

Velocity Suitability for O. mykiss

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Mainstem Growth

Growth of PIT-tagged Wild Steelhead Recaptured 1 yr after Tagging

Relationship Between Temperature & Trout Biomass Salt River Basin (Isaak and Hubert 2004)

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Conclusions

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Growth is a Key Driver

Hypothesis

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Over-winter Survival

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Tributary Growth