Biochemical and stress responses of rohu Labeo rohita and mrigal Cirrhinus mrigala in relation to acclimation temperatures

Abstract

The biochemical and stress responses of two Indian major carps, rohu Labeo rohita and mrigal Cirrhinus mrigala were studied after acclimating them to four preset temperatures (26, 31, 33 and 36 degrees C) for 30 days. The blood glucose and liver glycogen levels showed an inverse trend in both the species and were significantly different in L. rohita at higher temperatures. The decrease in the liver glycogen level of C. mrigala, however, was not significant. Plasma cortisol levels increased significantly whereas the ascorbic acid content in the brain and kidney of both the species decreased significantly with increasing temperatures. Total lipid content in the liver of both the species decreased significantly with increasing acclimation temperatures. The phospholipid concentration decreased in L. rohita with increasing acclimation temperatures, and in C. mrigala the values decreased up to 33 degrees C and increased at 36 degrees C. In C. mrigala, the cholesterol level decreased up to 33 degrees C and then increased at 36 degrees C, but the absolute value was lower in comparison to L. rohita. The cholesterol levels, however, were not significantly different in L. rohita. Triglycerides and free fatty acids concentrations decreased significantly with increasing acclimation temperatures in both the species. The present study indicates species-specific metabolic responses of L. rohita and C. mrigala to thermal acclimation.

Elevated temperature affects growth and hemato‐biochemical parameters, inducing morphological abnormalities of erythrocytes in Nile tilapiaOreochromis niloticus

“…Our results are in consistent with the findings of Das et al. (2009) who found highest growth within 31°C–33°C temperature range and lowest in 36°C for L . rohita early fry.…”

Effect of stocking density and journey length on the welfare of rohu (Labeo rohita Hamilton) fry

“…Several studies have shown alteration in the activities of enzymes related to cellular energy metabolism due to stress (Chatterjee et al 2006;Das et al 2009;Sarma et al 2009). LDH, the terminal enzyme of the glycolysis pathway which reversibly converts pyruvate to lactate and also involved in both glycolysis and gluconeogenesis depending on the tissue, is a very good stress indicator, as it shows higher activity in the aerobic tissues like muscle during oxygen tension and in the liver during gluconeogenesis (Verma et al 2007).…”

Maximizing the Potential of Stunted Fish Fingerlings through Innovative and Sustainable Aquaculture Practices for Enhanced Growth and Production

“…If any problems are detected, take appropriate measures to address them before releasing the fish into the culture pond. f. According to recent studies, proper acclimatization can significantly improve fish survival and growth rates in culture ponds [28,53,54]. It is essential to ensure that the fish are gradually introduced to the new environment to minimize stress and prevent mortalities.…”