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One of the important factors in the development of aquaculture is to provide a suitable diet, which can meet the nutritional needs of this fish, and on the other hand, the diet is as cheap as possible, so by doing this plan, you can finally get cheaper food by optimizing the food ration. This study was carried out over a 60-day period during the autumn and the winter of 2023 in the Fouman Aquaculture Research Station (Inland Water Aquaculture Research Institute). The fingerlings of Ctenopharyngodon idella with 7 grams weight were transferred to 100-liter fiberglass tanks and stocked with 7 fingerlings in each tank. The fish were divided into three treatments including three treatments 1: a diet whose main food items contain 24.5% soybean meal, 24.5% canola meal (equal ratio) Soybean and canola (Treatment 2: Diet where the main food items are 28% soybean meal, 20% canola (higher proportion of soybean meal) Treatment 3: Diet where the main food items are 29% canola meal, 21% soybean meal (higher proportion of canola meal) to The face was completely randomly divided. According to Duncan test, According to Duncan test with a confidence level of 95%, a statistical difference was observed between the treatments in terms of the mean food conversion rate (FCR), specific growth rate (SGR), weight gain (WG) (P<0.05).
The results showed that the maximum and minimum amount of weight gain were occurred in treatment2 (mean= 89.91±2.4) and treatment 3 (mean= 58.39±13.17), respectively. The minimum of the special growth rate (0.70±0.15) was observed in treatment 3 and the maximum of that (1.06±0.02) was measured in treatment2. The minimum average of FCR (2.O9±0.05) was referred to treatment2 and the maximum of that (3.69 ±1.09) was referred to the 3 treatment .referred to the 3 treatment The results obtained from the Kruskal-Wallis test did not show any significant difference in the biochemical composition of fingerlings of Ctenopharyngodon idella carcasses, including protein, fat, ash, and moisture among different treatments (P<0.05).
The lowest amount of carcass protein was observed in treatment 3 with a value of 16.31 and the highest value was observed in treatment 2 with a value of 16.61. Also, the lowest and highest amount of carcass fat was observed in treatments 2 and 3 (3.19 and 3.04), respectively. The minimum and maximum amount of carcass ash was related to treatment 1 and 3, respectively, and also the minimum and maximum moisture content of carcass was observed in treatment 1 and 3, respectively (79.44 and 79.65). According to the obtained results, it seems that the diet with 28% soybean meal and 20% canola (higher ratio of soybean meal) is the most suitable level of canola and soybean in the diet of fingerlings of Ctenopharyngodon idella.
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