Megalocytivirus infection in orbiculate batfish Platax orbicularis

Preeyanan Sriwanayos; Ruth Francis-Floyd; Mark F. Stidworthy; Barbara D. Petty; Karen Kelley; Thomas B. Waltzek

doi:10.3354/dao02594

DAO

Diseases of Aquatic Organisms

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DAO 105:1-8 (2013) - DOI: https://doi.org/10.3354/dao02594

Megalocytivirus infection in orbiculate batfish Platax orbicularis

Preeyanan Sriwanayos¹, Ruth Francis-Floyd^1,2, Mark F. Stidworthy³, Barbara D. Petty^1,2, Karen Kelley⁴, Thomas B. Waltzek^5,*

¹Program in Fisheries and Aquatic Sciences, School of Forestry Resources and Conservation, University of Florida, Gainesville, Florida 32653, USA
²Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida 32610, USA
³International Zoo Veterinary Group, Station House, Parkwood Street, Keighley, West Yorkshire BD21 4NQ, UK
⁴Interdisciplinary Center for Biotechnology Research (ICBR), Cellomics Division, Electron Microscopy and Bio-imaging Core Laboratory, University of Florida, Gainesville, Florida 32611, USA
⁵Department of Infectious Diseases and Pathology, College of Veterinary Medicine, University of Florida, Gainesville, Florida 32608, USA

*Corresponding author. Email: tbwaltzek@ufl.edu

ABSTRACT: Megalocytiviruses cause systemic disease in both marine and freshwater fishes, negatively impacting ornamental and food fish aquaculture. In this report, we characterize a megalocytivirus infection in a captive marine ornamental fish, the orbiculate batfish Platax orbicularis. Histologic examination revealed cytomegalic cells characterized by strongly basophilic granular intracytoplasmic inclusions within various organs. Transmission electron microscopy revealed icosahedral virus particles within the cytoplasm of cytomegalic cells consistent with an iridovirus infection. Analysis of the major capsid protein gene sequence confirmed that the orbiculate batfish virus is a member of the family Iridoviridae and is identical to the only other megalocytivirus reported from a marine ornamental fish, the Banggai cardinalfish Pterapogon kauderni iridovirus.

KEY WORDS: Iridovirus · Megalocytivirus · Orbiculate batfish · Phylogeny

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Cite this article as: Sriwanayos P, Francis-Floyd R, Stidworthy MF, Petty BD, Kelly K, Waltzek TB (2013) Megalocytivirus infection in orbiculate batfish Platax orbicularis. Dis Aquat Org 105:1-8. https://doi.org/10.3354/dao02594

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DAO 105:1-8 (2013) - DOI: https://doi.org/10.3354/dao02594

Megalocytivirus infection in orbiculate batfish Platax orbicularis

Preeyanan Sriwanayos1, Ruth Francis-Floyd1,2, Mark F. Stidworthy3, Barbara D. Petty1,2, Karen Kelley4, Thomas B. Waltzek5,*

Preeyanan Sriwanayos¹, Ruth Francis-Floyd^1,2, Mark F. Stidworthy³, Barbara D. Petty^1,2, Karen Kelley⁴, Thomas B. Waltzek^5,*