Abstract
A 60-day feeding trial was done to investigate the effects of iron and zinc nanoparticles (Fe-NPs and Zn-NPs) on the growth and physiology of Rohu, Labeo rohita. The study aimed to determine the optimal levels of Fe-NPs and Zn-NPs that could improve the growth performance and nutrient metabolism of the fish. Five experimental diets containing varying levels of Fe-NPs and Zn-NPs (10–50 mg/kg) were fed to the fish, along with a control diet. The study found that weight gain, biomass, and specific growth rate increased significantly up to 30 mg/kg feed, and feed utilization was more efficient in the same group. Whole body protein and lipid content were also higher at 30 mg/kg NPs. However, the haematological, lipid, and enzymatic profiles showed varying dose-dependent responses to NPs concentrations. The accumulation rate was higher for Fe-NPs than Zn-NPs in the liver. Based on the analysis, a dietary NPs level of 29.49 mg/kg feed was optimal for Rohu. These findings could contribute to the knowledge of regulatory mechanisms of nutrient metabolism and support sustainable aquaculture practices. In conclusion, this study highlights the potential benefits of using Fe-NPs and Zn-NPs in fish diets, as they can improve growth performance and nutrient metabolism. However, the results also suggest that the optimal levels of Fe-NPs and Zn-NPs vary depending on the specific physiological parameters being measured. Further research is needed to explore the long-term effects of Fe-NPs and Zn-NPs on fish health and the environment.
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