Infection dynamics of Bonamia exitiosa on intertidal Ostrea angasi farms

Jessica Jamuna Buss, Kathryn Helen Wiltshire, James Owen Harris, Jason Elliot Tanner, Marty Robert Deveney

Research output: Contribution to journalArticlepeer-review


Bonamia spp. cause epizootics in oysters worldwide. In southern Australia, Bonamia exitiosa Hine, Cochennac and Berthe, 2001 threatens aquaculture of Ostrea angasi Sowerby, 1871. Bonamia spp. infections can display strong seasonality, but seasonal dynamics of B. exitiosa–O. angasi are unknown. Ostrea angasi naïve to B. exitiosa infection were stocked onto farms in three growing regions, and B. exitiosa was monitored seasonally for one year. Environmental parameters we measured did not correlate with B. exitiosa prevalence or infection intensities. Extreme temperatures suggest O. angasi culture systems need development. Bonamia exitiosa prevalence increased over time. After three months, O. angasi had B. exitiosa prevalence of 0.08–0.4, and after one year, the prevalence was 0.57–0.88. At some sites, O. angasi had >0.5 B. exitiosa prevalence in >6 months, but at other sites, >9 months passed before prevalence was >0.5. Bonamia exitiosa infection intensities were low with no seasonal pattern but were affected by the interaction of site, season and oyster meat:shell ratio. Understanding infection and initiating a breeding programme for resistance would provide benefits for O. angasi industry expansion.

Original languageEnglish
Pages (from-to)359-369
Number of pages11
JournalJournal of Fish Diseases
Issue number3
Early online date9 Jan 2020
Publication statusPublished - Mar 2020


  • Bonamia exitiosa
  • farm trial
  • Ostrea angasi
  • South Australia


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