Abstract
In the present study, Labeo rohita juveniles previously fed with tryptophan (TRP) supplemented diet for 60 days were exposed to temperature and salinity stress for the next 30 days with the same feeding regime to evaluate the stress mitigating efficacy of TRP. After 30 days of exposure to temperature and salinity, the stress exposed groups recorded higher aspartate amino transferase (AST), alanine amino transferase (ALT) and lactate dehydrogenase (LDH) activities as compared to control. In, liver and muscles, the highest activities of LDH, AST and ALT were observed in TRP0+S+T followed by TRP0+T and TRP0+S groups. Dietary supplementation of TRP was found to significantly reduce the activities of these enzymes in both the tissues. The lowest and highest acetylcholine esterase activity was evidenced in TRP0+S+T and TRP0+NS (control) groups respectively. The serum chloride concentration and serum osmolarity of L. rohita juveniles were significantly increased upon salinity exposure while temperature did not cause any significant change. The lowest concentration of sodium was observed in TRP0+NS while all other salinity exposed groups recorded higher values. A reverse trend was noticed in case of serum potassium concentration, being highest in TRP0+NS. The dietary supplementation of TRP had no significant effect in modulating the potassium as well as chloride concentration. The results of the present experiment suggest that exposure to temperature and salinity alters the serum electrolytes and osmolarity and dietary supplementation of tryptophan helps in ameliorating the stress as evidenced by various enzymic responses.
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The authors are grateful to the Director, Central Institute of Fisheries Education (CIFE), Mumbai, for providing facilities and financial assistance for carrying out the work. The first author is grateful to CIFE for awarding the Institutional Fellowship.
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Akhtar, M.S., Pal, A.K., Sahu, N.P. et al. Serum Electrolytes, Osmolarity and Selected Enzyme Activities of Labeo rohita Juveniles Exposed to Temperature and Salinity Stress: Effect of Dietary l-Tryptophan. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 84, 973–980 (2014). https://doi.org/10.1007/s40011-013-0284-5
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DOI: https://doi.org/10.1007/s40011-013-0284-5