Background: Histopathological changes induced by a rise in the acclimation temperature in advanced Labeo rohita (Hamilton) fingerlings were studied to understand their adaptive ability to thermal changes. The histopathological changes in relation to the thermal changes have been widely used as bioparameters in the evaluation of fish health. Materials and Methods: The six experimental temperatures that the fishes were exposed to were 32, 34, 36, 38, and 40°C for a period of 30 days each. The fishes kept at an ambient temperature of 29.3±1.5°C were used as control. The major organs studied were gills, liver, kidney, and heart. No specific alterations were observed at control, 32, and 34°C. The organs were sampled at the end of 30 days exposure and histopathological changes of different organs were examined. Result and discussion: Different organs (gill, liver. Kidney and heart) show different histopathological changes in higher temperatures. However, adaptive and degenerative changes were found to occur at the higher temperatures of 36, 38, and 40°C. Conclusions: Changes of temperature can be tolerated by the fishes and it brings about adaptive physiological changes to compensate the effects of temperature. Significance: The study was helpful; to understand the adaptive mechanisms used by fishes with changes of environmental temperatures.
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