Document Type : Original Manuscript

Authors

1 Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.

2 Excellence Center of Warm Water Fish Health and Diseases, Ahvaz, Iran.

Abstract

Abstract
This study was conducted to investigate the effects of nano-selenium (Se) and vitamin C on the growth and nutritional indicators and body composition of common carp (Cyprinus carpio) juveniles. Experimental diets were prepared with three levels of nanoselenium (0, 0.5, and 1 mg/kg) and three levels of vitamin C (0, 500 and 1000 mg/kg). The fish were randomly divided into nine experimental groups in triplicate and fed with experimental diets for eight weeks. The results showed that fish fed with C500Se1 and C500Se0.5 diets had a significantly higher specific growth rate than other treatments (P<0.05). The lowest feed conversion ratio was observed in the C1000Se1 treatment and the highest in the control group (P<0.05). Also, based on the results, no significant change was observed in the carcass biochemical composition of common carp juveniles (P>0.05). In general, the results show that the composition of nanoselenium and vitamin C had positive effects on the growth and nutritional indicators of common carp, and it can be stated that the diet enriched with 500 mg of vitamin C and 1 mg of nanoselenium is recommended to increase the growth of common carp.
Introduction
Selenium (Se) is an essential micronutrient that participates in the structure of selenoproteins with vital biological functions in humans and animals. Selenium is involved in antioxidant defense, growth, fertility, immunity, digestion, and absorption of food in farmed animals, and has been used in nutritional studies on various fish species. Combined supplementation of nanoselenium and vitamin C improved growth performance and health status of Nile tilapia (Oreochromis niloticus) (Dawood et al., 2020). However, the positive effects of combining nanoselenium with vitamin C in common carp have not been investigated. As studies on other species suggest that the positive effects of nanoselenium can be enhanced in combination with other micronutrients (Khalil et al., 2022), the present study aimed to investigate the effects of nanoselenium and vitamin C on growth performance and body biochemistry of common carp (Cyprinus carpio) juveniles.
Materials and methods
Experimental diets were prepared with three levels of nanoselenium (0, 0.5 and 1 mg/kg) and three levels of vitamin C (0, 500 and 1000 mg/kg). The fish were randomly divided into 9 experimental groups in triplicates and were fed with experimental diets for 8 weeks. The fish were fed twice a day (9:00 am and 17:00 pm). Each experimental treatment was aerated with constant aeration and about 20% of water was daily exchanged. During the experiment, water quality parameters were daily monitored. Temperature ranges from 27.5 to 28.3oC, pH was between 7.5 and 7.8, dissolved oxygen was 7.2 to 7.5 mg/ml and photoperiods were about 10 hours of light and 14 hours of dark and was adjusted according to the daily natural light. At the end of the experimental period, all fish in each treatment were biometrically measured and the growth parameters were calculated.
Results
The results showed that fish fed with C500Se1 and C500Se0.5 diets had a significantly higher specific growth rate than other treatments (P<0.05). The lowest feed conversion ratio was observed in the C1000Se1 treatment and the highest in the control group (P<0.05). Also, based on the results, no significant change was observed in the carcass biochemical composition of common carp juvenile (P>0.05).
Conclusion
In the present study, the addition of nanoselenium and vitamin C, alone or in combination, to the diet of common carp increased the final weight and SGR and improved the FCR. These findings are in agreement with studies that investigated the effects of Nanoselenium or vitamin C supplements in their separate application on common carp (Ashouri et al., 2015; Ghafarifarsani et al., 2022) and other fish species (Çiçek and Özoğul, 2021, Dawood et al. 2021). In general, the results show that the composition of nanoselenium and vitamin C had positive effects on the growth and nutritional indicators of common carp and it can be stated that the diet enriched with 500 mg of vitamin C and 1 mg of nanoselenium is recommended to increase the growth of common carp.

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Main Subjects

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