A 12 weeks study had conducted to check the effects of plant extract (aqueous leaf extract of Guava and Star gooseberry) on bacterial community (DI) of Nile tilapia. I had done 16S rDNA sequencing for identification of bacteria.
"The results showed that emergence of Actinobacteria and disappearance of Verrucomicrobia in the plant extract treatment-groups compared to the control treatment".
What could be the possible reasons or scientific explanations behind this finding.