Swimming Speeds of Yellow Perch (<i>Perca flavescens</i>) Following an Abrupt Change in Environmental Temperature

Abstract

Groups of yellow perch (Perca flavescens) were acclimated to constant temperatures of 10 and 20 C. Acclimation temperatures were then abruptly reversed. Critical swimming speeds were determined prior to and following the temperature change at 24-h intervals. Adjustment (acclimation) of fish subjected to an increase in temperature was immediate. Fish subjected to a decrease in temperature required less than 24 h to regain maximum swimming capability.