Detection of a nonoccluded baculovirus in the freshwater crayfish cherax quadricarinatus in north america

J. M. Groff, T. McDowell, C. S. Friedman, Ronald Hedrick

Research output: Contribution to journalArticle

21 Scopus citations


A nonoccluded baculovirus was detected during a routine health examination of the tropical freshwater blue crayfish Cherax quadricarinatus reared in a farm in California, USA. The crayfish were progeny of captive-reared adults imported from Australia. There were no external or internal signs of disease in infected crayfish, but histological examination revealed eosinophilic to amphophilic intranuclear inclusions within the tubular epithelial cells of the hepatopancreas. The infected cells occurred throughout the hepatopancreas but never exceeded 10% of the cells constituting the tubule epithelium. Electron microscopy revealed numerous loosely enveloped, rod-shaped baculoviruses. The enveloped virions had a length of 292 ± 15 nm and a diameter of 102 ± 7 nm (mean ± SD). The cylindrical nucleocapsids often possessed squared ends and were 216 ± 13 nm in length by 47 ± 3 nm in width. There was no evidence of occlusion body formation similar to that known for certain other crustacean baculoviruses. The origin of the virus is uncertain, although a similar or identical agent has recently been detected among C. quadricarinatus in Australia.

Original languageEnglish (US)
Pages (from-to)275-279
Number of pages5
JournalJournal of Aquatic Animal Health
Issue number4
StatePublished - Jan 1 1993


ASJC Scopus subject areas

  • Aquatic Science

Cite this