Selection of Potential Bacterial Bioremediator for Tiger Grouper (Epinephelus fuscoguttatus) Juveniles Culture

Different bacterial bioremediators were isolated from microalga Chlorella vulgaris and grouper culture water respectively. The total ammonia degradation test showed that all six strains degraded the total ammonia-nitrogen (TAN) in-vitro. One strain with the highest degradation activities, BP-GRP/2 was further tested in-vivo to tiger grouper, Epinephelus fuscoguttatus juveniles culture. No significant differences can be seen on TAN degradation and soluble reactive phosphorus (SRP) of the grouper culture water, except for the nitrite level was decreased in the presence of the strain. Higher survival of the fish in the BP-GRP/2 treatment was also observed compared to control. These results showed that certain bacterial strains from microalgae and grouper culture water can act as bioremediators and improve the survival of the fish host.