Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (2): 123-129.doi: 10.11924/j.issn.1000-6850.casb2022-0066

Special Issue: 水产渔业

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Isolation, Identification and Antibiotics Susceptibility Test of Exiguobacterium profundum from Procambarus clarkii

SHI Ruixue(), LI Yanhe()   

  1. College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan 430070
  • Received:2022-02-11 Revised:2022-09-26 Online:2023-01-15 Published:2023-01-17

Abstract:

To identify the disease and mortality cause of Procambarus clarkii, a dominant strain isolated from hepatopancreas of the dying crayfish was identified as Exiguobacterium profundum by colony morphology observation, Gram staining, physiological and biochemical identification, 16srRNA sequencing analysis and phylogenetic tree construction. The resistance of this strain to 30 kinds of antibacterial drugs, including mycin G, ampicillin, cephalexin, amikacin, gentamicin, kanamycin, norfloxacin, cotrimoxazole and so on, was determined by disc diffusion method, and the results showed that the strain was sensitive to all the 30 kinds of drugs. After the regression infection experiment, it was inferred that the strain might be involved in the pathogenic process of P. clarkii. The current study could provide certain reference and a theoretical basis for the pathogen identification, drug diagnosis and treatment of E. profundum in P. clarkii.

Key words: Procambarus clarkii, Exiguobacterium profundum, pathogen identification, 16srRNA gene, drug susceptibility test, regression infection experiment