EFFECT OF EXTRACTED AND DRIED MICROFUNGI SCHIZOCHYTRIUM IN THE DIET ON FAT DEPOSITION AND SERUM BIOCHEMICAL INDEXES OF LITOPENAEUS VANNAMEI

To evaluate the effects of dietary extracted-and-dried microfungi Schizochytrium sp. (EDMS) on muscle nutritional composition, fatty-acid composition of muscle and hepatopancreas, and the biochemical composition of the serum of the Litopenaeus vannamei initial average weight of (5.810.24) g, meanSE), five isonitrogenous (41.65%-41.86% CP, crude protein) and isocaloric (17.6 MJ/kg) diets were formulated, containing 0 (control), 0.5%, 1.0%, 1.5% and 2.0% EDMS, named as control, EDMS05, EDMS10, EDMS15 and EDMS20, respectively. Each diet was randomly fed to triplicate groups of 45 shrimps per cage for 45d. The results showed that EDMS has no effect on crude lipid and crude protein of muscle (P0.05). EDMS increased the ash level and EMDS20 has significantly higher ash than EMDS05 (P0.05). EDMS significantly increased the percentage and content of the essential fatty acids in muscle and hepatopancreas (P0.05). The total triglyceride of serum was remarkably increased (P0.05) by adding EDMS and the total cholesterol of serum did not change significantly (P0.05) by adding EDMS. The HDL/LDL ratio in EDMS15 was significantly higher than that of the other groups (P0.05). EDMS decreased superoxide dismutase (SOD) and EMDS10 has the strongest effect (P0.05). EDMS significantly increased the Methane Dicarboxylic Aldehyde (MDA) in serum (P0.05). These results suggest that EDMS can improve n-3 HUFA deposition in the muscle of the white shrimp and increase a risk of lipid peroxidation.