Lymphocytic meningoencephalomyelitis associated with Myxobolus sp. (Bivalvulidae: Myxozoa) infection in the Amazonian fish Eigenmannia sp. (Sternopygidae: Gymnotiformes).
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 with Myxobolus 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 Myxobolus sp. in the central nervous system of Eigenmannia sp.
Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia, Universidade Federal Rural da Amazônia, Belém PA , Brasil, Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia - UFRA, Belém, PA, Brasil.
José Ledamir
JL
Sindeaux
Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia, Universidade Federal Rural da Amazônia, Belém PA , Brasil, Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia - UFRA, Belém, PA, Brasil.
Michele
M
Velasco
Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia, Universidade Federal Rural da Amazônia, Belém PA , Brasil, Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia - UFRA, Belém, PA, Brasil.
José Mauro Vianna da
JM
Silva
Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia, Universidade Federal Rural da Amazônia, Belém PA , Brasil, Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia - UFRA, Belém, PA, Brasil.
Patricia de Fátima Saco Dos
Pde F
Santos
Centro de Diagnóstico Veterinário, Presidente Prudente SP , Brasil, Centro de Diagnóstico Veterinário - CDAPVET, Presidente Prudente, SP, Brasil.
Osimar
O
Sanches
Edilson Matos Research Laboratory, Universidade Federal do Pará, Universidade Federal do Pará, Belém PA , Brasil, Edilson Matos Research Laboratory, Universidade Federal do Pará - UFPA, Belém, PA, Brasil.
Patricia
P
Matos
Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia, Universidade Federal Rural da Amazônia, Belém PA , Brasil, Carlos Azevedo Research Laboratory, Universidade Federal Rural da Amazônia - UFRA, Belém, PA, Brasil.
Edilson
E
Matos
D000818:Animals; D001938:Brazil; D005393:Fish Diseases / Q000469:parasitology*; D023702:Gymnotiformes / Q000469:parasitology*; D055766:Myxobolus; D055764:Myxozoa; D010273:Parasitic Diseases, Animal / Q000469:parasitology*