SREL Reprint #0628




Behavioral Thermoregulation of Largemouth Bass (Micropterus salmoides) in a Reservoir Receiving Thermal Effluent

David H. Bennett



Behavioral thermoregulations of largemouth bass (Micropterus salmoides) was determined by measuring internal temperatures on 781 fish from an area heated by a thermal effluent and 847 fish from a nonheated area.

Largemouth bass from the heated area manifested significantly higher mean body temperatures for 10 of 13 months than those from the nonheated area.  Internal temperatures were approximately 10C higher in bass from the heated area during December through March and averaged about 1 to 3C higher through the spring and early summer period.  During August and September 1970, body temperatures of bass were similar between areas.

Higher body temperatures from bass from the heated and nonheated areas were 36.2 and 31.4C, respectively.  Body weight and condition factor were negatively correlated with body temperatures of bass from the heated area, and from the nonheated area (weight), too.

Preferred water temperatures for bass in the heated waters were 20-22C in the winter and 28C in the summer.  Bass from the nonheated area predominately inhabited 29C water in the summer.

 Keywords: Par Pond Reservoir System

SREL Reprint #0628

Bennett, D.H. 1979. Behavioral thermoregulation of largemouth bass (Micropterus salmoides) in a reservoir receiving thermal effluent. Archiv fuer Hydrobiologie 86:193-203.

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