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Dietary zinc potentiates thermal tolerance and cellular stress protection of Pangasius hypophthalmus reared under lead and thermal stress
Author(s) -
Kumar Neeraj,
Krishnani Kishore K,
Chandan Nitish K,
Singh Narendra P
Publication year - 2018
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.13560
Subject(s) - biology , catalase , zinc , superoxide dismutase , zoology , lipid peroxidation , zinc toxicity , oxidative stress , biochemistry , chemistry , organic chemistry
Zinc micronutrient is the second most abundant trace element in the animal body, as it could not be stored in the body; hence, regular dietary zinc is required for animals. With this backdrops a 60 days feeding trial was conducted to study the effect of dietary zinc on the thermal tolerance and cellular metabolic stress of Pangasius hypophthalmus reared under Pb (1/21th of LC 50 , 4 ppm) and elevated temperature (34°C). Three isocaloric and isonitrogenous diets with Zn‐0, 10 and 20 mg/kg were prepared. Two hundred seventy‐three fish were randomly distributed into seven treatments in triplicate in completely randomized forms. Dietary zinc supplementation had remarkable ( p < .01) changes on thermal tolerance of P. hypophthalmus viz. CT min (critical temperature minima) and LT min (lethal temperature minima), CT max (critical temperature maxima) and LT max (lethal temperature maxima). The positive correlations were also observed between CT min and LT min (Y = −0.707 + 6.59x, R 2 , 0.875) and CT max and LT max (Y = −0.923 + 2.45x, R 2 , 0.960). The oxidative stress (catalase, superoxide dismutase and glutathione‐s‐transferase) and lipid peroxidation were significantly reduced and neurotransmitter enzyme ( AC hE) was significantly enhanced with zinc supplementation at the end of the thermal tolerance. The present study concluded that thermal tolerance of P. hypophthalmus enhanced by zinc supplementation through CT max LT max and CT min LT min and also by strengthening the antioxidative status along with neurotransmitter enzymes.