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Differences in gut microbial diversity and composition between growth phenotypes of farmed juvenile sandfish, Holothuria scabra
Summary
Researchers analyzed the gut bacteria of farmed sandfish sea cucumbers to understand why individuals from the same batch grow at different rates. They found that fast-growing and slow-growing animals had distinct gut microbial communities with different predicted metabolic functions. The study also cautioned that fecal samples do not accurately represent the gut microbiome, which is important for future aquaculture research methods.
The bacterial composition in the intestinal tract of the sandfish H. scabra is an important factor in the observed growth variability in aquaculture. The results show differences in diversity, composition and predicted physiological functions between the size groups, despite being from the same cohort and environment. It was also evident that the fecal microbiota differs from the gut and does not correspond to size category, warranting caution in using the fecal matter as a proxy to infer microbial composition and interactions in the gastrointestinal tract. Understanding the roles that these microorganisms play in sandfish growth could support the development of strategies to manage size variation in captive-bred sea cucumbers, or for the promotion and selection for faster-growing individuals.
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