Lymphocytic meningoencephalomyelitis associated with Myxobolus sp. (Bivalvulidae: Myxozoa) infection in the Amazonian fish Eigenmannia sp. (Sternopygidae: Gymnotiformes)

• Main Authors: José Ledamir Sindeaux Neto, Michele Velasco, José Mauro Vianna da Silva, Patricia de Fátima Saco dos Santos, Osimar Sanches, Patricia Matos, Edilson Matos
• Format: Article
• Language: English
• Published: Colégio Brasileiro de Parasitologia Veterinaria 2016-01-01
• Series: Revista Brasileira de Parasitologia Veterinária
• Subjects: Ituí; Amazônia; mixosporidios; histopatologia; microscopia; sistema-nervoso
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-29612016005003103&lng=en&tlng=en

Abstract The genus Myxobolus, parasites that infect fishes, which cause myxobolosis, includes spore organisms belonging to the phylum Myxozoa and represents approximately 36% of all species described for the entire phylum. This study describes lymphocytic meningoencephalomyelitis associated withMyxobolus sp. infection in the brain and spinal cord (the central nervous system, CNS) of Eigenmannia sp., from the Amazon estuary region, in the Administrative District of Outeiro (DAOUT), Belém, Pará, Brazil. In May and June 2015, 40 Eigenmannia sp. specimens were captured from this region and examined. The fish were anesthetized, slaughtered and dissected for sexing (gonad evaluation) and studying parasites and cysts; after diagnosing the presence of the myxozoans using a light microscope, small fragments of the brain and spinal cord were removed for histological processing and Hematoxylin-Eosin and Ziehl-Neelsen staining. Histopathological analysis of the brain and spinal cord, based on histological sections stained with Hematoxylin-Eosin, pronounced and diffuse edema in these tissues, and congestion, degeneration, and focal necrosis of the cerebral cortex. The present study describes lymphocytic meningoencephalomyelitis associated with infection by Myxobolussp. in the central nervous system of Eigenmannia sp.