Influence of replacing fish meal with soybean meal on carcass composition and plasma biochemical parameters of stellate sturgeon (Acipenser stellatus)

This study was conducted to determine the effect of fishmeal replacement by soybean meal on carcass composition and plasma biochemical parameters of stellate sturgeon (Acipenser stellatus). Five experimental diets formulated by substitution of 0, 10, 20, 30, and 40% of fishmeal by soybean meal. At the end of experiment, blood samples were taken from three fish of each tank and plasma glucose, cholesterol, total protein, calcium, albumen, magnesium and triglyceride in different treatments were determined. Based on the results, significant differences were found in carcass protein, lipid, and moisture content in fish fed diets with different SBM levels (P<0.05), but there were not significant difference in ash contents of different treatments (P>0.05). There were not significant differences in calcium and total protein of plasma, among treatments (P>0.05). Triglyceride levels were highest in the S10 treatment and there were significant difference between S10 and other treatments, except of F treatment. There were significant differences in plasma cholesterol, among treatments (P< 0.05) and F treatment had maximum amount. Significant differences were found in plasma albumen between S10 treatment with S20 and S40 treatments (P< 0.05). Glucose in fish fed F treatment was significantly higher than other treatments and it had statistically significant difference with other treatments, except of the S10 treatment (P<0.05). There were significant differences in plasma magnesium among treatments (P<0.05) and S40 had lowest amount. The results of the present study showed that replacing fish meal with soybean meal in juvenile stellate sturgeon diets can effected on carcass composition and plasma biochemical parameters.