Document Type : Original Manuscript
Authors
1 Khorramshahr University of Marine Sciences and Technology, Faculty of Marine Natural Resources, Fisheries Department, Khorramshahr, Iran.
2 Persian Gulf University, Persian Gulf Research Institute, Department of Biotechnology, Bushehr, Iran.
Abstract
This study aimed to determine the effect of feeding frequency on growth, nutrition, and survival indices in rainbow trout (Oncorhynchus mykiss). In this experiment, 216 rainbow trout with an average weight of 38 ± 0.11 g were distributed in 18 (300-liter fiberglass) tanks complete randomly. Three experimental treatments include different feeding times 1, 3, and 5 times a day (treatments 1, 2, and 3, respectively), were fed with 6 replications and based on 5% of biomass weight for 90 days. At the end of the experimental period, a significant difference was observed in all growth indices. In all these indicators, treatment 2 was superior to treatment 3. A significant difference was observed between treatments 2 and 1. The results of measuring feed efficiency ratio in this study showed that feed efficiency in treatment 1 has the lowest value and has a significant difference with treatments 2 and 3 (P<0.05). The highest value of this index was observed for treatment 2, while there was no significant difference with treatment 3. The lowest survival rate was observed in treatment 1, and the highest value was observed in treatment 2. The economic efficiency ratio showed the three times a day in treatment 2 the most cost-effective feeding times. So that the maximum amount of food cost was observed in treatment 1, and the minimum amount was observed in treatment 2. The results showed the frequency of feeding 3 times a day in terms of production in rainbow trout.
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