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Effect of biofloc technology on growth, digestive enzyme activity, hematology, and immune response of genetically improved farmed tilapia (Oreochromis niloticus)

文献类型： 外文期刊

作者： Long, Lina 1 ; Yang, Jing 1 ; Li, Yuan 2 ; Guan, Chongwu 1 ; Wu, Fan 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Fishery Machinery & Instrument Res Inst, Key Lab Fishery Equipment & Engn, Minist Agr, Shanghai 200092, Peoples R China

2.Shanghai Ocean Univ, Coll Engn, Shanghai 201306, Peoples R China

关键词： Tilapia;Biofloc technology;Growth performance;Digestive activity;Hematological parameters;Immune response

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： An 8-week experiment was conducted to investigate the effects of biofloc technology (BFT) on the growth, digestive activity, hematology, and immune response of genetically improved farmed tilapia (GIFT) in light-limited and zero-water exchange culture tanks. The experiment consisted of one BFT treatment and a control group with water exchange. Glucose was added to the BFT treatment to establish a carbon/nitrogen (C/N) ratio of 15. The stocking density was 3 kg m(-3) in each 500-L indoor tank. Nitrite and nitrate concentrations were significantly lower in the BFT treatment than in the control (P < 0.05). Fish survival was 100% at harvest. BFT significantly increased fish specific growth rate and net yield. Compared with the control group, the individual fish weight, weight gain and protein efficiency ratio of fish in the BFT treatment were 12.54%, 9.46%, and 22.2% higher, respectively, whereas the feed conversion rate was 17.5% lower. The crude protein, crude lipid, and ash contents of the biofloc were 41.13%, 1.03%, and 6.07%, respectively, while the crude lipid content of BFT fish exhibited an increasing trend. Significantly higher intestine amylase and liver lipase activities of fish were found in the BFT treatment. There was no significant difference in hematology analysis (in terms of white blood cell and red blood cell counts, hemoglobin and hematocrit levels), serum total protein content or total superoxide dismutase activity of fish between the two groups (P > 0.05), but the serum glutathione peroxidase and lysozyme activities were considerably higher in the BFT treatment than in the control fish (P < 0.05). The results of this study indicate that BFT can improve the growth, digestive enzyme activities, and immune response of GIFT.

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