Acclimation of Rainbow Trout to High pH to Prevent Stocking Mortality in Summer

Abstract
Rainbow trout, Salmo gairdneri, were exposed to gradual and rapid increases in pH to determine if they would acclimate to values above 9.0. The trout became acclimated to a pH of 9.8 when they were exposed to gradual increases over a period of 5 days. When trout were exposed to an increase of pH to 9.5 in 6 hours, marked stress and 50% mortality occurred. However, when the pH increase was to 9.3 in 6 hours, the trout only had a temporary loss of appetite.

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