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Diseases of Aquatic Organisms

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DAO 64:229-235 (2005)  -  doi:10.3354/dao064229

Histology, ultrastructure and prevalence of Henneguya piaractus (Myxosporea) infecting the gills of Piaractus mesopotamicus (Characidae) cultivated in Brazil

E. A. Adriano1,2,*, S. Arana3, N. S. Cordeiro4

1Centro de Pesquisa e Gestão de Recursos Pesqueiros Continentais – CEPTA/IBAMA, Rod. SP 201, Km 6,5, Caixa Postal 64, CEP 13630-970, Pirassununga, SP, Brazil
2Centro Univeritário da Fundação de Ensino Octávio Bastos (UNIFEOB), Avenida Octávio da Silva Bastos, s/n,Jardim Nova São João, CEP: 13870-000, São João da Boa Vista, SP, Brazil
3Departamento de Histologia e Embriologia, and
4Departamento de Parasitologia, Instituto de Biologia,Univertsidade Estadual de Campinas (UNICAMP), Caixa Postal 6109, CEP 13083-970, Campinas, SP, Brazil

ABSTRACT: The histopathological and ultrastructural characteristics of Henneguya piaractus, a parasite of the gill lamellae of Piaractus mesopotamicus are reported here. Histological analysis showed that the plasmodia were of the intralamellar type. The development of the plasmodia resulted in marked dilatation of the infected lamellae, with the neighbouring lamellae being displaced laterally. Discreet epithelial hyperplasia was observed, but there was no inflammatory reaction. Ultrastructural analysis showed that the plasmodium had a single thin wall that was in direct contact with the host cells. Pinocytic canals and points of phagocytosis were observed in the wall. The prevalence of the parasite varied according to host size, with the lowest prevalence occurring in hosts up to 10 cm long.

KEY WORDS: Myxozoa · Pacu · Histology · Ultrastructure · Lipid droplets · Prevalence

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