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Diseases of Aquatic Organisms

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DAO 36:77-80 (1999)  -  doi:10.3354/dao036077

Description of a hepatopancreatic rickettsia-like organism in the redclaw crayfish Cherax quadricarinatus

Brett F. Edgerton1,*, Howard C. Prior2

1Department of Microbiology and Immunology, James Cook University, Townsville, Queensland 4810, Australia
2Animal Research Institute, Queensland Department of Primary Industries, 665 Fairfield Rd, Yeerongpilly, Queensland 4105, Australia
*Present address: Animal Quarantine Policy Branch, Australian Quarantine and Inspection Service, GPO Box 858, Canberra, ACT 2601, Australia. E-mail:

ABSTRACT: Basophilic, Gram-negative, microcolonies of rickettsia-like organisms were observed in the hepatopancreatic tubule epithelium of 1 moribund Cherax quadricarinatus from a farm in north Queensland. The tissue tropism of the organism is distinct from the systemic rickettsia-like organism previously described from C. quadricarinatus. This paper briefly describes the histopathology, cytopathology and basic morphology of the hepatopancreatic rickettsia-like organism.

KEY WORDS: Cherax quadricarinatus · Redclaw freshwater crayfish · Rickettsia-like organism · Disease · Pathology

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