The replacement effect of soybean meal instead of fish meal in the diet on growth, quality of meat and some blood factors in sterlet fry (Acipenser ruthenus)

The aim of this study was to investigate the replacement of soybean meal instead of fish meal in the diet of sterlet and and its effect on growth, quality of meat and some blood factors during 56 days. For this purpose, 5 treatments were selected. Treatments 1, treatment 2, treatment 3, treatment 4 and treatment 5 had 0%, 10%, 20%, 30.7% and 45% soybean meal, respectively. There were 300 fishes (70.95±1.8 g) in fiberglass tanks. After the biometric and blood sampling, growth indices and blood factors were measured. Also, the quality of meat was evaluated. The results showed that fishes had a significant difference in terms of growth and obesity coefficient (P<0.05). Fishes fed with 10 percent of soybean meal diet had the highest blood indexes.There was a significant difference between treatments in terms of hemoglobin, hematocrit and protein in blood (P<0.05). Fishes fed with 10 and 45 percent of soybean meal diet had the highest hemoglobin, fishes fed with 45 percent of soybean meal diet had the highest hematocrit and fishes fed with 30.7 percent of soybean meal diet had the highest protein in blood. Also, the highest amount of protein in fish meat was seen in fishes fed with 20 percent of soybean meal diet and there was a significant difference compared with other treatments (P<0.05). It is better for the treatments 2 and 3 of soybean meal to be replaced with fish meal.