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SynopsisThe models developed here provide a precise quantitative description of the course of the thermal destruction experienced by fish during a slow heating experiment. However, a broader view of this work is that each of the abrupt transfer and slow heating techniques determines experimentally a functional relationship; the interdependence of these functional relationships is the actual focus of this study. In particular, it is shown that data from either type of experiment can be used to predict the observations from an experiment of the other type under certain assumptions.

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Different types of temperature-gradient devices used in the laboratory to determine temperature preferences of fish are classified and reviewed. The type of device used seems to have less effect on experimental results than do other variables such as age, size, season, physiological state, or social interactions. Key words: preferred temperature, thermal gradients, thermoregulation, behavioral, gradient devices, laboratory techniques