Fish Diseases and Management

5.4.2.3 Lymphoid organ parvo-like virus (LOPV)

LOPV was found in cultured shrimps (P. monodon, P. merguiensis and P. esculentus) in Australia. Affected shrimps had multinucleated giant cells in their hypertrophied lymphoid organs. Giant cells showed nuclear hypertrophy, marginated chromatin and formed fibrocyte-encapsulated spherical structures. Giant cell nuclei had intranuclear inclusion bodies containing DNA. Electron microscopic studies revealed the presence of 25-30 nm diameter virus - like particles. There is a speculation that IHHNV and LOPV are the same agent.