||Effects of Constant Temperatures and Diel Temperature Fluctuations on Specific Growth and Mortality Rates and Yield of Juvenile Rainbow Trout, 'Salmo gairdneri'.
Hokanson, Kenneth E. F. ;
Kleiner, Charles F. ;
Thorslund., Todd W. ;
||Environmental Research Lab.-Duluth, Minn.
Animal behavior ;
Water quality ;
Mathematical models ;
Regression analysis ;
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Specific growth and mortality rates of juvenile rainbow trout (Salmo gairdneri) were determined for 50 days at seven constant temperatures between 8 and 22C and six diel temperature fluctuations. For constant temperature treatments the maximum specific growth rate of trout fed excess rations was 5.12%/day at 17.2C. An average specific mortality rate of 0.35%/day was observed at the optimum temperature and lower. The highest constant temperature at which specific growth and mortality rates became equal (initial biomass remained constant over 40 days) was 23C. A yield model was developed to describe the effects of temperature on the living biomass over time and to facilitate comparison of treatment responses. These data are discussed in relation to establishment of criteria for summer maximum temperatures for fish.