Abstract
Abstract Laboratory experiments were conducted to determine the effects of rate of temperature decrease, acclimation time, acclimation temperature, and seasonal changes on the low-temperature tolerance of pinfish Lagodon rhomboides. The critical thermal minimum (CTMin) was insensitive to rates of temperature decrease between 0.5°C/h and 1.5°C/h but was linearly correlated (r = 0.984) with acclimation temperature, When water temperatures were decreased at 1.0°C/h, the mean CTM in of pinfish acclimated at 24.0°C was 3.4°C. Acclimation adjustments in CTM in for fishes transferred from 22.0°C to 11.7°C were complete within 5 d. Indeed, coldtemperature acclimation was 80% complete in 30 h. Seasonally acclimatized pinfish had mean CTM in values ranging from 0.5°C (January) to 5.3°C (July). Responses of pinfish to cold temperature in the laboratory may explain variations in mortality seen in natural pinfish populations during episodes of extreme cold.
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