Author(s): Mazdak Aalimahmoudi, Jasem ghafleh marammazi, Seyed Abdolsaheb mortazavizadeh

Abstract: The influence of stocking density (1.5, 3 and 6 kg.m^-2) was investigated on biochemical plasma including: Cortisol, Glucose and Cholesterol level of Beluga juveniles, for a period of 8 weeks. The mean weight at the start of trial was 143±0.29 g. Concentration of cortisol, glucose and plasma Cholesterol at the start trial was 8.57±1.1 ng.ml^-1, 70.12±3.6 mg.dl^-1, and 46±17.5mg.dl^-1 respectively. Cortisol and glucose concentrations showed significantly difference between treatments 3 and 6 kg.m^-2 on 30th day of rearing, but on 60th day of rearing cortisol and glucose concentrations had no significant difference among treatments. Cholesterol level had significant difference at treatment 1.5 kg.m^-2 on 30th and 60th day of rearing as compared to treatment 3 and 6 kg.m^-2 and control group, Cholesterol concentration had no significant difference among treatments 3 and 6 kg.m^-2. Results showed that rearing density had no a major effect on the growth, biochemical parameters of Beluga.

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