Gastric cryptosporidiosis in freshwater angelfish (Pterophyllum scalare)

Brian G Murphy, Daniel Bradway, Timothy Walsh, George E. Sanders, Kevin Snekvik

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


A freshwater angelfish (Pterophyllum scalare) hatchery experienced variable levels of emaciation, poor growth rates, swollen coelomic cavities, anorexia, listlessness, and increased mortality within their fish. Multiple chemotherapeutic trials had been attempted without success. In affected fish, large numbers of protozoa were identified both histologically and ultrastructurally associated with the gastric mucosa. The youngest cohort of parasitized fish was the most severely affected and demonstrated the greatest morbidity and mortality. The protozoa were morphologically most consistent with Cryptosporidium. All of the protozoan life stages were identified ultrastructurally and protozoal genomic DNA was isolated from parasitized tissue viscera and sequenced. Histological, ultrastructural, genetic, and phylogenetic analyses confirmed this protozoal organism to be a novel species of Cryptosporidium.

Original languageEnglish (US)
Pages (from-to)722-727
Number of pages6
JournalJournal of Veterinary Diagnostic Investigation
Issue number5
StatePublished - Oct 2009
Externally publishedYes


  • Angelfish
  • Cryptosporidiosis
  • Cryptosporidium
  • Fish
  • Protozoa
  • Pterophyllum scalare

ASJC Scopus subject areas

  • veterinary(all)


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