Histopathological effects of Amyloodinium ocellatum (E.-M.Brown) E.-M.Brown & Hovasse, 1946 (Alveolata: Dinophyseae) on the gills of Mugil liza (Valenciennes, 1836)

Autores/as

Virgínia Fonseca Pedrosa Laboratory of Immunology and Pathology of Aquatic Organisms, Institute of Oceanography, Federal University of Rio Grande, 96210030, Rio Grande, Brazil. https://orcid.org/0000-0003-3353-1994
Luana Bortolini Giesta Laboratory of Immunology and Pathology of Aquatic Organisms, Institute of Oceanography, Federal University of Rio Grande, 96210030, Rio Grande, Brazil. https://orcid.org/0009-0007-2189-8357
Pedro Anderson de Paiva dos Santos Laboratory of Immunology and Pathology of Aquatic Organisms, Institute of Oceanography, Federal University of Rio Grande, 96210030, Rio Grande, Brazil. https://orcid.org/0009-0003-3201-639X
Marcelo Okamoto Laboratory of Shrimp Culture, Institute of Oceanography, Federal University of Rio Grande, 96210030, Rio Grande, Brazil. https://orcid.org/0009-0008-2830-6112
Luis Alberto Romano Laboratory of Immunology and Pathology of Aquatic Organisms, Institute of Oceanography, Federal University of Rio Grande, 96210030, Rio Grande, Brazil. https://orcid.org/0000-0003-3144-3579

DOI:

https://doi.org/10.33936/at.v5i2.5909

Palabras clave:

branquias; histopatología; Mugil liza; parásito

Resumen

En este trabajo, describimos lesiones producidas por el protozoario dinoflagelado Amyloodinium ocellatum en las branquias de Mugil liza, causante de la enfermedad del terciopelo en varias especies de peces. Estos parásitos producen lesiones severas en las branquias, con hiperplasia de las células lamelares primarias y secundaria, ruptura de las células pilares e hiperplasia de las células de cloruro (ionocitos). La estructura branquial queda totalmente afectada, lo que impide una hematosis normal y altera la actividad osmoreguladora comprometiendo la salud de los peces. Las lesiones producidas por A. ocellatum son responsable por las altas tasas de mortalidad en los cultivos de peces generando pérdidas económicas en el sector productivo. En el presente trabajo, encontramos hiperplasia de células lamelares del epitelio respiratorio, disrupción epitelial, colapso de las laminillas secundarias y otras alteraciones que comprometen seriamente la función branquial.

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