Algicidal Potential of the Endosymbiont Bacterial Consortium of the Seagrasses Enhalus acoroides and Thalassia hemprichii

The isolate is the consortia of endosymbiont bacteria isolated from the seagrasses E. acoroides and T. hemprichii . The two isolates of these bacterial consortia can inhibit the growth of the dinoflagellate Porphyridium sp. The algicidal activities of the two consortia are 94.1% and 92.8%, respectively. However, the values of BG plankton culture are lower; they are 57.1% and 48.6%, respectively, which shows that the algicidal activities of the consortia of seagrass endosymbionts of dinoflagellate group are very good and good. The performance of algicidal activity of diatom group is relatively effective as for Nitzschia sp., ranging from 44.9% to 52.6%; however, the performance of algicidal activity of another diatom group is very low, which shows that the endosymbiont E. acoroides and T. hemprichii can be used as algicidal source. In general, the algicidal activity of the endosymbiont-bacterial consortium of the EhEd isolate is stronger than that of ThEd in the target dinoflagellate group. This fact makes it possible to use the endosymbiont bacterial consortium as a bio-agent that can overcome the so-called algal bloom phenomenon affecting the dinoflagellate group in general and Porphyridium sp. and BG culture.