Dietary L‐tryptophan modulates growth and immuno‐metabolic status of Labeo rohita juveniles exposed to nitrite |
| |
| Authors: | Alexander Ciji Narottam Prasad Sahu Asim Kumar Pal Mohammad Shahbaz Akhtar |
| |
| Affiliation: | 1. Division of Fish Nutrition, Biochemistry and Physiology, Central Institute of Fisheries Education, Mumbai, India;2. Fish Nutrition Section, Directorate of Coldwater Fisheries Research, Bhimtal, Nainital, India |
| |
| Abstract: | Effect of nitrite exposure on growth and immuno‐metabolic responses of Labeo rohita fed L‐tryptophan (TRP) was studied. Fish previously fed normal and elevated levels of tryptophan for 60 days were exposed to nitrite (2.0 mg L?1) for another 45 days with same feeding regime. There were four treatment groups, viz., TRP0‐N (control), TRP0+N, TRP0.75+N (0.75% supplemental tryptophan in the diet) and TRP1.5+N (1.5% supplemental tryptophan in the diet). Highest weight gain% and SGR were observed in control and lowest in TRP0+N. Dietary supplementation of elevated levels of tryptophan augmented weight gain% and SGR. Nitrite exposed groups recorded higher catalase, SOD, LDH, AST and ALT activities compared with control. However, activities reduced with additional levels of tryptophan supplementation. Nitrite exposure reduced WBC count, total protein, albumin, globulin and lysozyme activity compared with unexposed group but groups which were fed additional amounts of tryptophan restored total protein, albumin and globulin similar to TRP0‐N. In conclusion, nitrite exposure had adversely affected growth, increased activities of LDH, AST, ALT, catalase, but decreased WBC, serum protein, lysozyme and acetylcholine esterase activity of L. rohita. Normal requirement of tryptophan was unable to combat nitrite stress. However, dietary fortification with tryptophan (minimum 0.75% of diet + normal requirement) found effective in combating nitrite induced stress. |
| |
| Keywords: |
Labeo rohita
nitrite tryptophan growth glucose reno‐somatic index lysozyme
WBC
|
|
|
