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Co-infection of infectious spleen and kidney necrosis virus and Francisella sp. in farmed pearl gentian grouper (female Epinephelus fuscoguttatus x male E. lanceolatus) in China - A case report

文献类型： 外文期刊

作者： Huang, Yucong 1 ; Cai, Shuanghu 1 ; Jian, Jichang 1 ; Liu, Guangfeng 3 ; Xu, Liwen 3 ;

作者机构： 1.Guangdong Ocean Univ, Guangdong Prov Key Lab Pathogen Biol & Epidemiol, Fisheries Coll, Zhanjiang, Peoples R China

2.Guangdong Higher Educ Inst, Southern Marine Sci & Engn GuangdonS Lab Zhanjian, Key Lab Control Dis Aquat Econ Anim, Zhanjiang, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab South China Sea Fishery Resources Exploit, Guangzhou, Peoples R China

4.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou 510300, Peoples R China

关键词： Pearl gentian grouper; ISKNV; Francisellai sp.; Co-infection

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2020 年 526 卷

页码：

收录情况： SCI

摘要： From October-December 2018, a mass mortality among cultured pearl gentian grouper (female Epinephelus fuscoguttatus x male E. lanceolatus) occurred on a private grouper farm in Zhanjiang City, Guangdong Province, China. Approximately 120 dead fish from each pond were recorded daily, and the cumulative mortality was up to 52% within 56 days. Diseased fish showed clinical signs such as lethargy, anorexia, slow swimming or staying near the pond edge, and dark body surface and petechiae of the gills. The notable internal gross pathological changes of diseased fish were splenomegaly, renomegaly, hepatic congestion, and the absence of apparent white nodules. Histopathological examinations revealed that hypertrophic cells were dispersed in various tissues and many spherical bacteria-like organisms were found in macrophages. PCR detection and sequence analysis confirmed the simultaneous presence of infectious spleen and kidney necrosis virus (designated as ISKNV-ZJ) and Francisella sp. (designated as zj09) in the diseased fish. Phylogenetic analysis revealed that virus strain ISKNV-ZJ was closely related with ISKNV and Murray cod iridovirus (MCIV), while bacterial strain zj09 was closely related with strains F. halioticida. This is the first report of natural co-infection of ISKNV and Francisella sp. in pearl gentian grouper.

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