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Abstract

Effects of green tea in fish based oxidized oil was evaluated in this study. Lipid of diet was replaced by oxidized fish oil (OFO) at 0, 50 and 100% levels. Green tea extract (GTE) was added to diet in 3 levels, 0, 5 and 100 mg/kg giving a total of 9 experimental diets. Two hundred and seventy sturgeon hybrid (Huso huso ♀ × Acipenser ruthenus ♂), mean weight of 211.71±0.23 g randomly divided in 27 fiberglass tanks with 700 l volume after 2 weeks adaptation. After 6 weeks, biometry was done to evaluate growth performance and blood samples were taken. The result showed that feeding with OFO had no effects on condition factor and specific growth rate. However, in fish fed GTE feed efficiency ratio and protein efficiency ratio improved slightly. Red blood cells were not affected by OFO and GTE while in fish received GTE and both GTE and OFO white blood cells increased significantly (P<0.05). Immunological parameters, (IgM, ACH50 and Lysozyme) showed significant increase in compare to control (P<0.05). Our findings showed that feeding of sturgeon hybrid with OFO had no effects on growth but GTE improved feeding performance. Also OFO had no effects on immune function.