Recovery of Bacillus mycoides, B. pseudomycoides and Aeromonas hydrophila from common carp (Cyprinus carpio) and rainbow trout (Oncorhynchus mykiss) with gill disease

Petya Orozova, I. Sirakov, Dawn Amy Austin, Brian Austin

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


During a 3-month period from June to the end of August 2016, ~5% mortalities were observed in a farm with rainbow trout (Oncorhynchus mykiss Walbaum) and one farm of common carp (Cyprinus carpio L.) in Bulgaria. The disease was manifested by gill ulcers/rot, asphyxiation and bloody ascites. Aeromonas hydrophila was isolated from the internal organs of all the diseased fish. Bacillus mycoides or B. pseudomycoides were recovered from the gill lesions on diseased carp and rainbow trout, respectively, with identification achieved by conventional phenotyping and by sequencing of the 16S rRNA gene. In vivo experiments confirmed that all three organisms were pathogenic to rainbow trout.

Original languageEnglish
Pages (from-to)125–129
Number of pages5
JournalJournal of Fish Diseases
Issue number1
Early online date26 Jul 2017
Publication statusPublished - Jan 2018


  • Aeromonas hydrophila
  • B. pseudomycoides
  • Bacillus mycoides
  • Co-infection
  • Gill disease

ASJC Scopus subject areas

  • Aquatic Science
  • veterinary (miscalleneous)


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