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Edwardsiellosis in farmed turbot, Scophthalmus maximus (L.), associated with an unusual variant of Edwardsiella tarda: a clinical, aetiological and histopathological study

文献类型: 外文期刊

作者: Qin, L. 1 ; Xu, J. 1 ; Wang, Y. G. 2 ;

作者机构: 1.Huaihai Inst Technol, Coll Marine Sci, Lianyungang, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fishery Res Inst, Qingdao, Peoples R China

关键词: granuloma;turbot Scophthalmus maximus (L.);macrophage;histopathology;non-flagellated Edwardsiella tarda

期刊名称:JOURNAL OF FISH DISEASES ( 影响因子:2.767; 五年影响因子:2.689 )

ISSN: 0140-7775

年卷期: 2014 年 37 卷 2 期

页码:

收录情况: SCI

摘要: During 2005 and 2010, a survey of edwardsiellosis on eight turbot, Scophthalmus maximus (L.), farms was conducted in China. This report presents the detailed results of the study on this disease. Diseased turbot displayed two distinct types of gross signs: black discoloration of the dorsal skin on the posterior portion of the body; and red cutaneous foci on the ventral side. Internally, the most pronounced clinical signs in all fish examined were enlarged kidneys. The causal agent of the disease was finally proved to be one species of bacterium that was identified as Edwardsiella tarda by physiological and biochemical tests, API 32E and 16S ribosomal RNA sequence analysis. It is noteworthy that unlike the commonly described E.tarda strains, the isolates in this study were non-motile strains without flagella. A histopathological study revealed that E.tarda infection was systemic in turbot and that kidney showed the most significant pathological changes, including acute focal necrosis, an influx of macrophages and formation of granuloma. The most common histopathological characteristics of this disease are the proliferation of macrophage in various organs and formation of granuloma. In addition, this article also gave background information on the disease and presented the results of virulence tests with the E.tarda strain identified in this study.

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