نوع مقاله : مقاله پژوهشی
1 دانشجوی کارشناسی ارشد شیلات، دانشگاه دریانوردی و علوم دریایی چابهار، دانشکده علوم دریایی
2 گروه شیلات، دانشگاه گنبد کاووس، دانشکده کشاورزی و منابع طبیعی
3 کارشناس کارگاه تکثیر و پرورش ماهیان خاویاری شهید مرجانی آق قلا
عنوان مقاله [English]
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<0.05). The value of immunoglobulin M (IgM) decreased with increasing biomass levels in treatments. The lowest level of IgM (0. 24 g/l) were observed in treatment of T4 (stoking of 5000 g/m3). In some of treatments changing the stocking biomass had significant effect on values of cholesterol, triglyceride and albumin (p<0.05). Maximum of cholesterol (90/50 mg/dl) and triglyceride (467/50 mg/dl) was obtained in T1. Blood plasma biochemical analyses showed that increasing the stocking biomass of Beluga juvenile caused increase in values of plasma protein in treatments of T2, T3 and T4 in comparison with T1 and T5. The minimum of this parameter (1/90 g/dl) was detected in T5 (stoking of 6250 g/m3). This study highlighted that the different biomass of Beluga juvenile in rearing tanks had different effects on blood biochemical parameters in this fish.