Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 8185
Title: Growth temperature requirements and lower lethal temperatures for juvenile smallmouth bass (Micropterus dolomieui)
Author: W. B. Horning, Roger E. Pearson
Publication Year: 1973
Journal: Journal of the Fisheries Research Board of Canada
Volume: 30
Issue: 8
Pages: 1226-1230

Maximum growth rate of juvenile smallmouth bass (Micropterus dolomieui), grown at constant temperatures of 16, 23, 26, 29, 32, and 35°C, occurred at approximately 26°C.  Fish held at 35°C demonstrated a negative growth rate.  The average 96–hr low temperature TL50 values (median tolerance limit) varied from 1.6 to 10.1°C for smallmouth bass acclimated to 15 and 26°C, respectively.  Intermediate values were obtained for fish acclimated to 18 and 22°C.  An important aspect of the study was the occurrence of a secondary fungous infection on the fish after 96–hr exposure to cold temperatures.  In some cases the infection was severe enough to cause complete mortality within 7 days.  

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