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Determination of the Infectious Agent of Translucent Post-Larva Disease (TPD) in Penaeus vannamei

文献类型： 外文期刊

作者： Zou, Ying 1 ; Xie, Guosi 1 ; Jia, Tianchang 1 ; Xu, Tingting 1 ; Wang, Chong 1 ; Wan, Xiaoyuan 1 ; Li, Yingxia 1 ; Luo, K 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Key Lab Marine Aquaculture Epidemiol & Biosecur, Key Lab Marine Aquaculture Dis Control,Minist Agr, Qingdao 266071, Peoples R China

2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266071, Peoples R China

关键词： infectious agent; Vibrio parahaemolyticus; translucent post-larvae disease (TPD); glass post-larvae disease (GPD); Penaeus vannamei

期刊名称：PATHOGENS （ 影响因子：3.492； 五年影响因子：4.066 ）

ISSN：

年卷期： 2020 年 9 卷 9 期

页码：

收录情况： SCI

摘要： A new emerging disease called "translucent post-larvae disease" (TPD) or "glass post-larvae disease" (GPD) ofPenaeus vannamei, characterized by pale or colorless hepatopancreas and digestive tract, has become an urgent threat to the shrimp farming industry. Following this clue that treatment of an antibacterial agent could alleviate the disease, systematic investigation of the potential infectious agent of TPD was conducted using bacterial identification and artificial challenge tests to fulfill Koch's postulates. A dominant bacterial isolate,Vp-JS20200428004-2, from the moribund individuals was isolated and identified asVibrio parahaemolyticusbased on multi-locus sequence analysis. However,Vp-JS20200428004-2 differed from theV. parahaemolyticusthat caused typical acute hepatopancreatic necrosis disease. Immersion challenge tests revealed thatVp-JS20200428004-2 could cause 100% mortality within 40 h at a dose of 1.83 x 10(6) CFU/mL, and experimental infected shrimp showed similar clinical signs of TPD. TheVp-JS20200428004-2 could be re-isolated and identified from the experimental infected individuals. Moreover, histopathological analysis of diseased samples indicated that Vp-JS20200428004-2 caused severe necrosis and sloughing of epithelial cells of the hepatopancreas and midgut in shrimp individuals both naturally and experimentally infected. Our present results indicated that Vp-JS20200428004-2 is a highly virulent infectious agent associated with the TPD and deserves further attention.

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