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Dietary L‐tryptophan modulates growth and immuno‐metabolic status of L abeo rohita juveniles exposed to nitrite
Author(s) -
Ciji Alexander,
Sahu Narottam Prasad,
Pal Asim Kumar,
Akhtar Mohammad Shahbaz
Publication year - 2015
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12355
Subject(s) - nitrite , tryptophan , lysozyme , biology , catalase , labeo , albumin , globulin , nitric oxide , biochemistry , medicine , endocrinology , food science , enzyme , nitrate , amino acid , fish <actinopterygii> , ecology , fishery
Effect of nitrite exposure on growth and immuno‐metabolic responses of L abeo 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., TRP 0 ‐N (control), TRP 0 +N, TRP 0.75 +N (0.75% supplemental tryptophan in the diet) and TRP 1.5 +N (1.5% supplemental tryptophan in the diet). Highest weight gain% and SGR were observed in control and lowest in TRP 0 +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 TRP 0 ‐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.