Journal of Aquatic Ecology

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The aim of this study was to assess the effects of different doses of zero-valent iron nanoparticles in the diet of common carp fingerling on growth performance, proximate composition, and biochemical blood parameters. For this purpose, 150 fish with an average initial weight of 6.14 ± 0.10 g were fed on the experimental diets for 8 weeks. The diets contained 0, 50, 100, 150 and 200 mg/kg zero-valent iron nanoparticles. Based on the results, fish were fed the diet supplemented with 150 mg/kg zero-valent iron nanoparticles displayed significant difference in final weight, weight gain, final length, specific growth rate, body weight increase, average daily growth, feed efficiency, protein efficiency ratio and lipid efficiency ratio (P<0.05). The hepatosomatic index was the highest in the NI₀ treatment (P<0.05). Dietary nano-iron had no effects on proximate composition (moisture, ash, and protein) of common carp fed different diets (P>0.05), whereas the fat content of fish fed by 50 mg/kg zero-valent iron nanoparticles was significantly higher compared to other experimental diets (P<0.05). Fish fed by 150 mg/kg zero-valent iron nanoparticles showed significantly higher total protein, but the highest alkaline phosphatase activity in plasma was found in fish fed 50 mg/kg zero-valent iron nanoparticles (P<0.05). No significant differences were observed in glucose content among different groups (P>0.05). Based on the results, 150 mg/kg zero-valent iron nanoparticles in the diet has more influence than larger scales due to the increased surface to volume ratio and  can be  recommended in diet of common carp fingerlings.

Keywords: Carcass analysis, Common carp, Growth, Plasma indices, Zero-valent iron

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