Abstract
An experiment was conducted to study the stress mitigation and growth enhancing role of dietary l-tryptophan (TRP) under thermal stress in rohu, Labeo rohita fingerlings for 45 days. Seven hundred and twenty fishes were distributed in three major groups that are ambient temperature (26 °C), 34 and 38 °C in triplicate following a complete randomized design. Acclimation of fishes to 34 and 38 °C over average ambient temperatures were carried out at 1 °C/day. Each group was fed with a diet supplemented with 0, 0.36, 0.72 or 1.42 % l-TRP. Results showed that blood glucose and serum cortisol level were found to be significantly higher (p < 0.05) in the higher temperature groups than the ambient temperature group. Similarly, aminotransferase, lactate dehydrogenase, malate dehydrogenase, CAT, superoxide dismutase activities were found to be significantly higher (p < 0.05) in the control groups (0 % l-TRP) and decreasing activities of these enzymes were observed with the increasing level of dietary l-TRP. In different temperature groups, l-TRP-supplemented groups were found to have higher (p < 0.05) growth, RGR and PER. The results obtained in the present study indicate that dietary l-TRP mitigates thermal stress and enhances growth. From the present study, we can conclude that dietary supplementation of l-TRP at the 0.72 % level in the diet is found to be optimum to reduce thermal stress even up to 38 °C in rohu, L. rohita. The baseline data obtained here could be useful for the farmers to formulate feeds to culture the fish in different agro-climatic zones.
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The authors are grateful to the Director, Central Institute of Fisheries Education, Mumbai, for providing the necessary facilities to carry out this research work.
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Kumar, P., Saurabh, S., Pal, A.K. et al. Stress mitigating and growth enhancing effect of dietary tryptophan in rohu (Labeo rohita, Hamilton, 1822) fingerlings. Fish Physiol Biochem 40, 1325–1338 (2014). https://doi.org/10.1007/s10695-014-9927-6
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DOI: https://doi.org/10.1007/s10695-014-9927-6