A Study on Bacterial Etiology and Histopathology Associated With Hemorrhagic Disease in American Shad Alosa sapidissima

IF 1.9 4区农林科学 Q2 FISHERIES

Aquaculture Research Pub Date : 2024-12-11 DOI:10.1155/2024/8869167

Kai Chen, Jinlong Li, Yao Zheng, Nailin Shao, Bingwen Xi, Jun Xie

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Abstract

American shad Alosa sapidissima is an important exotic farmed fish species in China. Recently, skin ulcers associated with significant morbidity and mortality have severely affected American shad culture in Spring. In this study, a bacterial strain C8 was isolated from diseased A. sapidissima and was identified as A. hydrophila based on traditional phenotypic typing and 16S rDNA sequence analyses. Drug susceptibility test revealed the isolate was sensitive to Quinolones and Amphenicols but resistance to Aminoglycosides, Sulfonamides, and Tetracyclines. Experimental infection with the isolate C8 showed the typical symptoms of acute sepsis caused by A. hydrophila infection and 100% mortality. Histopathological observation revealed that substantial inflammatory cell infiltration occurred in the skin lesion of diseased fish, and extensive degenerative and necrosis was observed in the parenchymal cells of the liver and kidney. This study is the first report on the histopathology of cultured A. sapidissima caused by A. hydrophila and provides useful information for health management.

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美国沙棘出血性疾病的细菌病因学和组织病理学研究

美洲沙鱼是中国重要的外来养殖鱼种。最近，与显著发病率和死亡率相关的皮肤溃疡严重影响了春季美国鲥鱼养殖。本研究从患病的a . sapidissima中分离到一株菌株C8，经传统表型分型和16S rDNA序列分析鉴定为嗜水a .。药敏试验结果表明，该菌株对喹诺酮类药物和氨霉素类药物敏感，对氨基糖苷类药物、磺胺类药物和四环素类药物耐药。实验感染C8菌株表现为典型的嗜水单胞菌感染引起的急性脓毒症，死亡率100%。组织病理学观察显示，病鱼皮肤病变处出现大量炎性细胞浸润，肝、肾实质细胞广泛退行性坏死。本研究首次报道了嗜水单胞杆菌引起的人工培养的鼠血单胞菌的组织病理学变化，为健康管理提供了有益的信息。

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来源期刊

Aquaculture Research 农林科学-渔业

CiteScore

4.60

自引率

5.00%

发文量

464

审稿时长

5.3 months

期刊介绍： International in perspective, Aquaculture Research is published 12 times a year and specifically addresses research and reference needs of all working and studying within the many varied areas of aquaculture. The Journal regularly publishes papers on applied or scientific research relevant to freshwater, brackish, and marine aquaculture. It covers all aquatic organisms, floristic and faunistic, related directly or indirectly to human consumption. The journal also includes review articles, short communications and technical papers. Young scientists are particularly encouraged to submit short communications based on their own research.