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Aquaculture International

, Volume 27, Issue 5, pp 1301–1314 | Cite as

Staphylococcus aureus causes hepatopancreas browned disease and hepatopancreatic necrosis complications in Chinese mitten crab, Eriocheir sinensis

  • Longlong Fu
  • Tianheng Gao
  • Hucheng Jiang
  • Faqi Qiang
  • Yan Zhang
  • Jianlin PanEmail author
Article
  • 23 Downloads

Abstract

The objective of this study was to determine the probable pathogen causing the recently discovered hepatopancreas browned disease (HPBD) in Chinese mitten crab (Eriocheir sinensis), an important freshwater aquaculture species. Hepatopancreas material was collected from 30 E. sinensis individuals confirmed as infected using plasma coagulase tests. Genes nuc and femA, both specific for Staphylococcus aureus, were amplified by reverse transcription-PCR from three randomly selected HPBD-infected crabs, specific bands were observed at 191 and 397 bp, and amplified partial sequences aligned perfectly (100%) with published nuc and femA gene sequences using BLAST and GenBank. Four major developmental stages of hepatopancreas histopathological changes were observed in 7-week reverse infection challenge tests in 90 pathogen-induced animals; hepatopancreas material changed colour from orange to yellow, red to brown, and light brown to almost fully necrotised. Optical and transmission electron microscopy revealed similar hepatopancreas pathological characteristics to those of HPBD-infected E. sinensis. The hepatopancreas browning rate of infected crabs (88.89 ± 5.09%) was significantly higher than controls (7.78 ± 1.92%). These results suggest S. aureus is the probable pathogen causing HPBD in E. sinensis, and infection leads to inflammation, atrophy, and complication of hepatopancreatic necrosis.

Keywords

Eriocheir sinensis Staphylococcus aureus nuc femA Hepatopancreas browned disease Necrosis 

Notes

Funding information

This work was supported by the Modern Fisheries Industry Technology System Project of Jiangsu Province (grant number JFRS-01), the Important Research and Development Plan Project (Modern-agriculture) of Jiangsu Province (grant number BE2017383), and the Sanxin Aquaculture Project of Jiangsu Province (grant numbers D2015-5, D2016-1), China.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Freshwater Fisheries Research Institute of Jiangsu ProvinceJiangsu ProvinceChina
  2. 2.Institute of Marine Biology, College of OceanographyHohai UniversityJiangsu ProvinceChina
  3. 3.Jiangsu Hipore Feed Co., LtdJiangsu ProvinceChina

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