Abstract
In this study, the effects of replacement of fish meal by soybean meal and cottonseed meal on growth, body composition, blood and serum parameters of Russian sturgeon (Acipenser gueldenstaedtii) were investigated. Five experimental diets were formulated to be isonitrogenous (49 % protein) and isolipidic (20 % lipid). Diets were prepared with graded levels (20 % and 40 %) of soybean (SM) and cottonseed (CM) meals as SM20, SM40, CM20, CM40 and a control diet (FM, only fish meal with no SM and CM inclusion). Sturgeon (50.00±0.06 g) were randomly distributed into fifteen 500-L square tanks at 25 fish per tank. Fish were weighed in bulk biweekly after suspending feeding for 1 day. Fish were fed near satiation by hand at 08:00, 12:00 and 16:00 hours for 8 weeks. Sturgeon fed CM20 and CM40 diets displayed higher specific growth rate (SGR) and lower feed conversion ratio (FCR) when compared with fish fed SM40 and FM (P<0.05). There were no differences among groups for the percentage of blood cells, including lymphocytes, monocytes and granulocytes of sturgeons. Alkaline phosphatase (ALP) of SM20 and SM40 groups were significantly lower than that of FM group (P<0.05). The results of this study revealed that dietary cottonseed meal could be used for enhancement in juvenile sturgeon.
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