New disease records for hatchery-reared sturgeon, II, Phaeohyphomycosis due to Veronaea botryosa

Natalie K. Steckler, Roy P.E. Yanong, Deborah B. Pouder, Akinyi Nyaoke, Deanna A. Sutton, Jonathan R. Lindner, Brian L. Wickes, Salvatore Frasca, Jeffrey C. Wolf, Thomas B. Waltzek

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A series of fungal cases in hatchery-reared juvenile and young adult Siberian sturgeon Acipenser baerii and white sturgeon A. transmontanus occurred at production facilities in Florida and California, USA, respectively. Affected fish exhibited abnormal orientation and/or buoyancy, emaciation, coelomic distension, exophthalmos, cutaneous erythema, and ulcerative skin and eye lesions. Necropsies revealed haemorrhage throughout the coelom, serosanguinous coelomic effusion and organomegaly with nodular or cystic lesions in multiple organs. Fungal hyphae were observed in 27 fish (24 A. baerii and 3 A. transmontanus) via microscopic examination of tissue wet mounts and on slides prepared from colonies grown on culture media. Histo - pathological examination of these infected tissues revealed extensive infiltration by melanised fungal hyphae that were recovered in culture. Phenotypic characteristics and sequencing of the fungal isolates with the use of the internal transcribed spacer region and 28S rRNA gene confirmed the aetiological agent as Veronaea botryosa. To our knowledge, this is the first documentation of V. botryosa infection in fish, although melanised fungi of the closely related genus Exophiala are well-known pathogens of freshwater and marine fishes.

Original languageEnglish (US)
Pages (from-to)229-238
Number of pages10
JournalDiseases of Aquatic Organisms
Issue number3
StatePublished - Oct 16 2014


  • Acipenser baerii
  • Acipenser transmontanus
  • Aquaculture
  • Fungus

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science


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