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Monoclonal antibodies (mAbs) play an important role in detection of aquareoviruses. Three mAbs against grass carp reovirus (GCRV) were prepared. Isotyping revealed that all three mAbs were of subclass IgG2b. Western blot assay showed that all three mAbs reacted with GCRV 69 kDa protein (the putative VP5). In addition to the 69 kDa protein of GCRV, mAb 4B6 also recognize a 54 kDa protein. All three mAbs were used for detecting aquareovirus by Western blot assay and indirect immunofluorescence assay (IFA). All of them reacted with GCRV, and mAb 4A3 could also react with turbot Scophthalmus maximus reovirus (SMReV) and largemouth bass Microptererus salmonides reovirus (MsReV). Viral antigens were only observed in the cytoplasm of infected cells. Finally, syncytia formation was observed with light microscopy and fluorescence microscopy using fluorescein labelled 4A3 mAb at various times post-infection. Syncytia were observed at 36 hr post-infection (hpi) by light microscopy and at 12 hpi by fluorescence microscopy. The immunofluorescence based assay allowed earlier detection of virus than observation of virus-induced cytopathic effect (CPE) assay in inoculated cell cultures. The sensitivity and specificity of these mAbs may be useful for diagnosis and monitoring of aquareoviruses. [ABSTRACT FROM AUTHOR]