Marine biotechnology (New York, N.Y.)Sep 11, 2020

Changes in Mud Crab Gut Bacteria After Infection with WSSV Virus and Aeromonas hydrophila Bacteria

Updated Mar 31, 2026

Abstract

The gut microbiota of mud crabs infected with A. hydrophila and WSSV showed significant decreases in composition and bacterial correlations.

Infection with A. hydrophila resulted in major regulatory effects on the host's gut microbiota.
In contrast, WSSV infection allowed many beneficial bacteria to influence the host despite the presence of pathogens.
Differences in gut microbiota responses were observed between viral and bacterial infections.
The study highlights the impact of these pathogens on the structure, composition, and function of gut microbiota in mud crabs.

Simplified

Mud crab Scylla paramamosain (S. paramamosain) is an economically important marine crab species around the world. White spot syndrome virus (WSSV) and Aeromonas hydrophila (AH) are pathogens during mud crab mariculture. It has been reported that gut microbiota possessed a great impact on the host development, nutrition, immunity, and disease resistance. However, little information was known about the impacts of WSSV or AH infection on the structure, composition, and function of the gut microbiotain of mud crabs. In this study, the gut microbiota of mud crabs infected with A. hydrophila and WSSV were characterized. The results showed that the composition and bacteria correlation of the gut microbiota were significantly decreased. During A. hydrophila infection, the pathogens played a major regulatory role in host. While in the mud crabs infected with WSSV, many beneficial strains had a great impact on the host expect for the pathogens. Therefore, our study revealed the effect of pathogens infection on gut microbiota of mud crabs and clarified the difference between viral infection and bacterial infection.

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