

FOLLOWUS
1.Wuxi Fisheries College, Nanjing Agricultural University, Nanjing 210095, China
2.Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
Huaishun SHEN,shenhuaishun@ffrc.cn
Received:03 September 2021,
Accepted:08 October 2021,
Online First:26 November 2021,
Published:2022-09
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Jie GONG, Guoqing SHEN, Mengru ZHU, et al. 16S rRNA gene sequencing analysis on changes in the intestinal flora of
Jie GONG, Guoqing SHEN, Mengru ZHU, et al. 16S rRNA gene sequencing analysis on changes in the intestinal flora of
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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