Epizootic ulcerative syndrome causes cutaneous dysbacteriosis in hybrid snakehead ( Channa maculata♀ × Channa argus♂ )

PeerJ

article

Zhifei Li¹  Guangjun Wang¹  Kai Zhang¹  Wangbao Gong¹  Ermeng Yu¹  Jingjing Tian¹  Jun Xie¹  Deguang Yu¹ 

[1] Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences;Guangdong Ecological Remediation of Aquaculture Pollution Research Center

关键词: Cutaneous microbiota;    Fish disease;    Epizootic ulcerative syndrome;    Aphanomyces;    Hybrid snakehead;   

DOI  :  10.7717/peerj.6674

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Cutaneous microbiota play an important role in protecting fish against pathogens. Aphanomyces infection causes epizootic ulcerative syndrome (EUS) in fish, and by perturbing the integrity of the cutaneous microbiota, increases the potential for infection by pathogenic bacteria. However, whether the composition of the cutaneous microbiota is altered in fish with EUS, and if so, which species are changed and how this might influence infected fish, is still largely unclear. Considering the importance of cutaneous microbiota in maintaining host health, we hypothesized that Aphanomyces infection significantly enhances the presence of certain bacterial pathogens in the cutaneous microbiota and causes cutaneous dysbacteriosis. To test this hypothesis, we compared the cutaneous microbiota compositions of hybrid snakehead (Channa maculata♀ × Channa argus♂) with and without Aphanomyces infection using Illumina Miseq sequencing of the 16S rRNA gene. Our results showed that the cutaneous microbiota of hybrid snakehead were significantly altered subsequent to EUS infection and that the numbers of potentially pathogenic bacteria classified into the genera Anaerosinus, Anaerovorax, Dorea, and Clostridium were significantly enhanced in the cutaneous microbiota of hybrid snakehead with EUS, whereas bacteria classified into the genera Arthrobacter, Dysgonomonas, Anoxybacillus, Bacillus, Solibacillus, Carnobacterium, Lactococcus, Streptococcus, Achromobacter, Polynucleobacter, Vogesella, and Pseudomonas were significantly reduced. These results imply that treatment for EUS should not only take into consideration the control of Aphanomyces reproduction but should also focus on regulating the cutaneous microbiota of infected fish.

【 授权许可】

CC BY