Abstract
Swimming stamina and survival in relation to severe stress (swimming fatigue) were assessed in fresh water and seawater during various stages of the parr-smolt transformation for both 0-age and yearling coho salmon ( Oncorhynchus kisutch). It was determined that coho salmon normally experience transient reductions in stamina when transferred directly to seawater. Coho salmon also experience transient reductions in their ability to survive severe physical stress (swimming fatigue) at direct seawater entry. Stress survival during the first week of seawater residence was significantly correlated to the status of smoltification, with the maximum ability to survive stress coinciding with the freshwater developmental peaks of both plasma thyroxine (T 4) and gill Na +K + ATPase.
Published Version
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