Bacillus supplements changed fish gut microbes, with mixed diversity results
A meta-analysis of fish studies found changes in several microbial measures, but it did not establish human probiotic benefits or demonstrate better fish health.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Bacillus supplementation was associated with increases in several measures of diversity within fish gut microbial communities, while no significant change was reported in diversity between communities. The analysis also reported shifts in bacterial composition. These are microbiome findings in fish; the abstract does not establish improved growth, fewer infections, or relevance to human supplementation.
This abstract-based summary lacks fish species, sample sizes, comparison-group details, and treatment durations. Microbial composition and diversity are the reported endpoints, so the authors' favorable interpretation should not be treated as demonstrated health benefit.
What was reanalyzed
Researchers reanalyzed publicly available bacterial gene-sequence data from studies of Bacillus supplementation. They examined whether microbial patterns varied with the bacterial species used, the amount given, the feeding form, and treatment duration.
Microbial shifts need interpretation
Some diversity indices increased, while the between-community diversity result was not statistically significant. Bacteria described as candidate probiotics became relatively more abundant, and potentially pathogenic groups less abundant; those labels do not establish actual infection outcomes.
The original publication
Decadal Meta-Analysis Confirms Bacillus spp. Optimizes Fish Intestinal Microbiota.
Yang Q, Jin Y, Yang L et al.
Ann N Y Acad Sci · 2026
- PubMed ID
- 41387388
- Record checked
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