|SREL Reprint #0883|
Evaluating the Constraints of Temperature, Activity and
Consumption on Growth of Largemouth Bass
A. Rice, James E. Breck, Steven M. Bartell and James F. Kitchell
We present a bioenergetics model for largemouth bass
(Micropterus salmoides) which simulates growth as a function of
body size, temperature, activity and consumption level.
We apply the model to investigate seasonal changes in condition factor
exhibit by bass in par Pond, South Carolina, a reservoir receiving heated
effluent. Previous authors have
suggested that these changes occur due to bioenergetic constraints, primarily
the effects of heated effluent on metabolic rate.
Model simulations were used to evaluate the hypotheses that seasonal
changes in condition factor were caused by the heated effluent, seasonally
variable activity, seasonal variable consumption, or reproductive costs.
Results indicate that temperature is not directly
responsible for the seasonal change sin condition factor.
Bass moderate the influence of the heated effluent via behavioral
thermoregulation. Activity is not a
major factor, and spawning weight-loss can account for only a small portion of
the observed variation. However, the pattern of seasonal changes in body condition
may be adequately explained by seasonal variations in consumption.
The patterns of consumption rate and/or prey availability suggested by
model simulations represent testable hypothesis.
Growth model, Bioemergetics, Micropterus salmoides, Par
Pond, Thermal effluent, Condition factor, Behavioral thermoregulation
SREL Reprint #0883
Rice, J.A., J.E. Breck, S.M. Bartell, and J.F. Kitchell. 1983. Evaluating the constraints of temperature, activity and consumption on growth of largemouth bass. Environmental Biology of Fishes 9:263-275.