Water quality control in aquaculture system by Bacillus cereus S458-1

Abstract:

[Objective] Bacillus cereus is widely used as a probiotic in aquaculture. The aim of this study focusses on the effects of Bacullus cereus S458-1, as previously isolated strain in our lab, on aquaculture water quality and healthy of gibel carp (Carassius auratus gibelio).[Methods] According to the control variable method, we set up the same temperature, salinity, dissolved oxygen and pH in the aquaculture process, used spectrophotometry method to measure chemical indexes, and commercial kit method to determine serum physiological and biochemical indexes of gibel carp.[Results] Compared with the control group (without S458-1), in the Bacillus cereus S458-1 supplemented aquaculture groups, the concentration of soluble reactive phosphorus was significant increased (P<0.05). NH₄⁺ and NO₂^- converted into NO₃^-, even the data had no significant difference between the control group and S458-1 supplemented groups. The concentration of serum glutamic-oxaloacetic transaminase, superoxide dismutase, glutathione peroxidase, and malondialdehyde significantly decreased (P<0.05).[Conclusion] Bacillus cereus S458-1 plays important role in aquaculture system, and promotes nitrogen and phosphorus removal, regulates water quality, and enhances healthy condition of the aquaculture animals.

Key words:Bacillus cereus;S458-1;phosphate solubilization;soluble reactive phosphorus