عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This study was carried out to find the effects of 17-ß estradiol (E2) on biochemical parameters, sex steroids and carcass composition in juvenile stellate sturgeon (Acipenser stellatus). One hundred and eighty 5-month stellate sturgeon with an average weight of 11.7 ± 0.2 g were divided into 3 treatments with 3 replicates each with 20 fish per tank. The treatments were included 0, 25 and 50 mg E2/kg diet. At the termination of 7 months feeding trial with different levels of E2,blood biochemical parameters, sex steroids and carcass composition were measured. The results of biochemical parameters including plasma glucose, total protein, cholesterol, triglyceride, calcium and phosphorus showed dose-dependent manner. The lowest and highest levels of all biochemical parameters were observed in fish fed control and 50 mg E2/kg diet, respectively (p<0.05). Plasma sex steroids concentrations showed the lowest level of E2 in fish fed control diet, while the highest levels of testosterone and progesterone were observed in this treatment (p<0.05). Proximate carcass analysis showed no significant difference in moisture, crude protein, crude fat and ash contents among the treatments (p>0.05). Final weight, total length, hepatosomatic and viscerosomatic indices were also affected by different levels of E2 (p<0.05). The results of present study demonstrated that using E2 in the diet of juvenile stellate sturgeon can influence most of biochemical indices and sex steroids which seems that those were related to the changes of sex ratio and some physiological parameters.