Thermal tolerance and preference of the Indian catfish Heteropneustes fossilis |
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Authors: | Sudhir Vasal Bangalore I. Sundararaj |
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Affiliation: | (1) Department of Zoology, University of Delhi, Delhi, 110007, India |
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Abstract: | Synopsis The catfish Heteropneustes fossilis tolerates a wide range of temperatures. The minimal (7.9°C) and maximal (39.8°C) lethal temperature values obtained during summer are higher than the minimal (4°C) and maximal (37.7°C) lethal temperature values obtained during winter; gradual heating or cooling versus abrupt exposure to various temperatures did not produce significant differences. Catfish acclimated to temperatures of 28° (summer) or 16°C (winter) finally selected temperatures ranging from 31.3° to 32° C, when placed in a temperature gradient of 15° to 35° C. Catfish avoid temperatures below 25° C regardless of seasonal acclimatization. |
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Keywords: | Temperature preference Lethal temperature Behavioral thermoregulation Acclimatization |
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