Zinc is the second most abundant trace element in the animal body.It cannot be stored in the body (Zalewski et al., 2005) and can be consumed as regular dietary intake to meet the physiological need of the body. As a component of numerous enzymes and hormones, it is necessary for the proper physiological functioning (Prasad, 1991).Several important enzymatic activities like alcohol dehydrogenase, alkaline phosphatase (ALP), aldolase, lactate dehydrogenase (LDH), RNA and DNA polymerases, reverse transcriptase and superoxide dismutase (SOD) are dependent on this micronutrient. Zinc oxide nanoparticles have been stated to enhance growth performance, Abstract A 120-day feeding trial was conducted to assess the effects of dietary supplementation of zinc oxide (ZnO) and selenium (Se) nanoparticles (NPs) on growth, immunological and enzymatic profiles in rohu, Labeo rohita. Fishes were fed with basal diet incorporated with laboratory-synthesized nanoparticles, viz., zinc oxide nanoparticles-10 mg/kg and Se nanoparticles-0.3 mg/kg throughout the experimental period. At an interval of every 30 days, treated and control fishes were randomly collected and subjected to estimation of growth, non-specific immune parameters and serum enzyme assays. It was observed that there was significant (p < 0.05) increase in growth and non-specific immune parameters like respiratory burst, lysozyme and myeloperoxidase activities as compared to the control group (only basal diet). Serum enzymatic profiles such as lactate dehydrogenase and alkaline phosphatase activities down-regulated (p < 0.05) in treated group compared to control group, and superoxide dismutase and acetylcholine esterase activity up-regulated in treated group. The relative percentage survival (RPS) found to be significantly higher in treated groups (60.00 ± 8.82%) as compared to control group (45.00 ± 6.17%) while challenged with virulent bacterial strain Aeromonas hydrophila. These results indicated that dietary supplementation of zinc oxide (ZnO) and selenium (Se) nanoparticles stimulates immunity and enhances resistance to bacterial infection in L. rohita. K E Y W O R D SA. hydrophila, aquaculture, enzyme activities, growth performance, immune response, nanoparticles How to cite this article: Swain P, Das R, Das A, Padhi SK, Das KC, Mishra SS. Effects of dietary zinc oxide and selenium nanoparticles on growth performance, immune responses and enzyme activity in rohu, Labeo rohita (Hamilton). Aquacult Nutr. 2019;25:486-494. https://doi.
The study aimed to identify an effective phosphate-solubilizing and organochlorine pesticide-tolerant bacterial strain(s). A total of 50 phosphate-solubilizing bacterial (PSB) strains were isolated from pesticide-stressed soil. Ten isolates showing higher solubilization were selected for organochlorine pesticides (endosulfan, aldrin, and lindane) tolerance. The strain IITISM08 showed the maximum potential of phosphorous solubilization in Pikovaskya agar medium (solubilization index = 3.2) and in broth medium (348 ± 2 μg mL) and tolerated up to 250 μg mL of organochlorine pesticides. During phosphorous solubilization, the presence of functional group and organic acid production were also observed using FT-IR and HPLC. The plant growth-promoting (PGP) traits of the strain IITISM08 was highly inhibited in presence of endosulfan among the three organochlroine pesticides. The strain IITISM08 degraded aldrin (79%), lindane (68%), and endosulfan (51%) at a concentration of 50 μg mL. The strain IITISM08 was identified using 16S rDNA gene sequencing as Paenibacillus sp. (IITISM08). The study revealed that the strain IITISM08 can be used as PGP candidate even under organochlorine pesticide-stressed condition.
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