Study of biochemical indicators of Beluga (Huso huso) juveniles with different stocking biomass

The impact of rearing Beluga (Huso huso) juvenileunder five different stocking biomass was investigated depending on the biochemical parameters as indicators of general health state of fish. One-year old Beluga juvenile (48.59±8.52 g) were reared for 35 days. The present study was conducted in a completely randomized design. Fish were cultured in triplicates of fiberglass tanks under stocking biomass of 1250, 2500, 3750, 5000 and 6250 g/m3 as T1, T2, T3, T4 and T5 respectively. Blood plasma biochemical analyses showed that increasing the stocking biomass caused significant increase for value of alanine aminotransferase (ALT) and maximum of ALT was obtained in T5 (stoking of 6250 g/m3). Different stocking levels of Beluga juveniles had variety effects in value of aspartate aminitransferase (AST) and this enzyme decreased in T2, T3 and T5 but increased in T4. Value of alkaline phosphatase (ALP) showed non-significant difference among treatment (p>0.05). Variety in stocking levels of fish had significant effects on values of complement (C4) and this parameter was significantly increased in treatment of T2, T3, T4 and T5 in comparison with T1 (stoking of 1250 g/m3) (p