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Effect of different water biofloc contents on the growth and immune response of gibel carp cultured in zero water exchange and no feed addition system
Author(s) -
Zhang Mingming,
Li Ye,
Xu DeHai,
Qiao Guo,
Zhang Jialin,
Qi Zhitao,
Li Qiang
Publication year - 2018
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13620
Subject(s) - biology , carp , lysozyme , immune system , superoxide dismutase , antioxidant , food science , zoology , aquaculture , alkaline phosphatase , mucus , acid phosphatase , microbiology and biotechnology , biochemistry , enzyme , fishery , immunology , ecology , fish <actinopterygii>
This study evaluated the growth and immune response of gibel carp ( Carassius auratus gibelio ) cultured under no feed addition biofloc technology ( BFT ) system at different total suspended solid ( TSS ) concentrations (10, 300, 600, 800 and 1,000 mg/L for group BF 0‐ NF , BF 300‐ NF , BF 600‐ NF , BF 800‐ NF and BF 1000‐ NF ) for 30 days. The results demonstrated that bioflocs contained rich nutrients, and gibel carp eaten bioflocs showed higher weight gain, specific growth and survival. Digestive enzyme activities such as pepsin and amylase increased significantly in BF 300/600/800/1000‐ NF groups than those in BF 0‐ NF group. Antioxidant response including superoxide dismutase and total antioxidant capacity in serum and skin mucus was also enhanced significantly ( p < .05). In addition, six immune‐related genes were examined by RT ‐ qPCR . Compared with BF 0‐ NF group, expression levels of immune genes intelectin ( ITLN ), dual specificity phosphatase 1 ( DUSP 1), keratin 8 ( KRT 8), myeloid‐specific‐peroxidase ( MPO ), c‐type lysozyme (c‐lys) and interleukin‐11 ( IL ‐11) were up‐regulated by 78.1‐, 23.9‐, 13.8‐, 138.8‐, 401.8‐ and 91.1‐fold, respectively. The highest expression values were observed at TSS of 600–800 mg/L. This study suggested that bioflocs can be uptaken by gibel carp as a food source, and have a potential to be used as a supplemental food for aquaculture.