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Modulatory effect of dietary copper nanoparticles and vitamin C supplementations on growth performance, hematological and immune parameters, oxidative status, histology, and disease resistance against Yersinia ruckeri in rainbow trout (Oncorhynchus mykiss)

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Abstract

Copper and vitamin C are micronutrients needed for the living organism’s functions. Vitamin C has a great effect on the immune system of fish. The present study aimed to evaluate the effects of dietary copper nanoparticles (Cu-NPs) and vitamin C (VC) supplementations on rainbow trout (Oncorhynchus mykiss) juveniles. So, 216 rainbow trout juveniles were randomly assigned to six groups with trial diets supplemented with Cu-NPs and VC including 0/0 (T1, control diet), 0/250 (T2), 0/500 (T3), 2/250 (T4), 2/500 (T5), and 2/0 (T6) mg Cu-NPs/VC per kg diet. After the feeding trial for 60 days, the fish were challenged with Yersinia ruckeri, and the survival rate was calculated for 15 days. Based on the data analysis, weight gain (WG), specific growth rate (SGR), protein efficiency ratio (PER), lysozyme, alternative complement activity (ACH50), hematocrit (Hct), hemoglobin (Hb), and mean corpuscular volume (MCV) were significantly (p < 0.05) increased in the fish fed on T4 and T5 diets compared with the control group. Catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GPX) were significantly (p < 0.05) decreased in the fish fed with diets contain Cu-NPs and VC (T4 and T5). The expressions of TNF-α, IL-1ß, IL-10, SOD, CAT, and GPX genes were significantly (p < 0.05) decreased in the fish fed on T3, T4, and T5 diets versus the control. In addition, the dietary Cu-NPs and VC supplementations significantly enhanced resistance against pathogens and led to the control of infection in rainbow trout. In conclusion, Cu-NPs and VC administered as feed additives at 2/250–500 mg/kg elevated the growth performance, antioxidant capacity, and health of rainbow trout.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank Dr. Khosravanizadeh for his time and energy and all staff of Hamoon International Wetland Research Institute for the financial support and cooperation.

Funding

The research project was funded by the University of Zabol (Grant cod: IR-UOZ-GR-7925).

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DNM: MSc student; these data are coming from his thesis; GA: Associate professor in the Department of Fisheries and the main supervisor for the student. He provided all the scientific suggestions and grants; MHJ: He is the second supervisor and provided scientific suggestions; DA: She was the advisor for the work and provided scientific comments; RA: He was the advisor for the scientific group.

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Correspondence to Ahmad Gharaei.

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All procedures were carried out in accordance with the Animal Care and Use Committee guidelines at the Faculty of Sciences of the University of Zabol.

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Delavari, N.M., Gharaei, A., Mirdar, H.J. et al. Modulatory effect of dietary copper nanoparticles and vitamin C supplementations on growth performance, hematological and immune parameters, oxidative status, histology, and disease resistance against Yersinia ruckeri in rainbow trout (Oncorhynchus mykiss). Fish Physiol Biochem 48, 33–51 (2022). https://doi.org/10.1007/s10695-021-01036-2

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  • DOI: https://doi.org/10.1007/s10695-021-01036-2

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