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16S rRNA gene sequencing analysis on changes in the intestinal flora of Procambarus clarkii with “Black May” disease

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Abstract

The morbidity and mortality peak of farmed Procambarus clarkii occurs around May every year, a phenomenon known as “Black May” disease (BMD). Increasing evidence shows that the intestinal flora is closely related to host health. We analyzed and compared the microbiota of healthy and BMD-affected P. clarkii intestines. The results show that there was no significant difference in bacterial α-diversity (richness P=0.59; evenness P=0.43; and diversity P=0.052) between the diseased group and the control group. Four dominant phyla in the intestines of crayfish in the control group, namely Tenericutes (30.86%), Bacteroidetes (29.99%), Firmicutes (22.23%), and Proteobacteria (15.23%), were identified. However, a striking shift in the microbial composition were found in the intestines of P. clarkii with BMD. Bacteroidetes was a dominant phylum in healthy P. clarkii, whereas the prevalence was low in diseased P. clarkii (1.87%). By contrast, the prevalence of Proteobacteria was significantly higher (P<0.05) in P. clarkii with BMD than in P. clarkii without BMD. Candidatus Bacilloplasma, Bacteroides, Vibrio, and Aeromonas showed significant differences (P<0.05) at the genus level. Tax4Fun function prediction indicated that the relative abundance of genes involved in energy metabolism in the intestinal flora of P. clarkii with BMD was significantly reduced (P<0.05). Therefore, BMD can change the composition of the intestinal microbiota of P. clarkii. This study contributes to the understanding of the relationship between intestinal flora and host especially in aquatic animals.

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Data Availability Statement

All raw data were submitted to the NCBI Sequence Read Archive (SRA) under accession number PRJNA692534. The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Correspondence to Huaishun Shen.

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Supported by the Natural Science Fund Project of Jiangsu Province (No. BK20181138) and the Central Public-Interest Scientific Institution Basal Research Fund, Freshwater Fisheries Research Center, CAFS (No. 2019JBFZ09)

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Gong, J., Shen, G., Zhu, M. et al. 16S rRNA gene sequencing analysis on changes in the intestinal flora of Procambarus clarkii with “Black May” disease. J. Ocean. Limnol. 40, 2068–2079 (2022). https://doi.org/10.1007/s00343-021-1278-4

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  • DOI: https://doi.org/10.1007/s00343-021-1278-4

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