Influence of poly-β-hydroxybutyrate and it,s degrading bacteria on metabolic diversity of anaerobic bacteria in siberian sturgeon (Acipenser baerii) hindgut

Poly-β-hydroxybutyrate (PHB) is a natural polymer that can be depolymerized by bacterial extracellular enzymes into β-hydroxybutyric acid monomers.
In this study, the effects of PHB and it’s degrading bacteria on the metabolic diversity of anaerobic bacteria in Siberian sturgeon hindgut were investigated in four treatments (Control, 2% PHB, combination of two degrading bacteria, 2% PHB two bateria) for 60 days. The Shanon diversity index, Evenness and Pareto-Lorenz curve was calculated with BiologTM Ecoplates data.
The results indicated that using supplemented diets significantly increased Shanon index and evenness then control (PDiscussion and Our results suggest that the diet supplemented with PHB and it’s degrading bacteria increase anaerobic bacterial diversity, however, degrading bacteria cannot accelerate PHB degradation in fish hindgut.