Ultraestrutura de Protozoários parasitas de Peixes da região Amazônica

Abstract

RESUMO -Neste trabalho descrevemos alguns detalhes ultraestruturais de novas espécies de protoparasitas do phylum Myxozoa (Henneguya adherens, Η. malabarica, Η. striolata, Η. testicularis, Tetrauronema desaequalis and Myxobolus braziliensis), recentemente encontrados e descritos em peixes da bacia amazônica. São descritos os aspectos ultraestruturais do ciclo de vida dos parasitas, incluindo o esporo, vetor biológico responsável pela transmissão do parasita. Por outro lado, é analizada a ação do parasita no hospedeiro e referidos efeitos nefastos da ação parasitária.Palavras-chave: Ultraestrutura, Protoparasitas, Peixes de Água Doce, Amazônia. Ultrastructure of Protozoan Parasites of Fishes of the Amazon Region.ABSTRACT -In this study we report some ultrastructural details of some recently described species of parasites of the phylum Myxozoa (Henneguya adherens, H. malabarica, H. striolata, H. testicularis, Tetrauronema desaequalis and Myxobolus braziliensis), found in fishes of the Amazon region. Some ultrastructural aspects of the life cycle with special reference to the spore morphology are described. The action of the parasites in host fishes is analyzed and the harmful effects of their parasitic activity are discussed.

Gastric coccidiosis in Thoracocharax stellatus caused by Goussia guamaensis n. sp. (Apicomplexa: Eimeriidae) from the Amazon region

“…For light microscopy, small fragments (0.5 cm) of the fixed tissue were embedded in paraffin (Luna, 1968), from which 5 μm sections were obtained and stained with haematoxylin-eosin (HE) and Masson (Matos, Casal, Matos, Corral, & Azevedo, 2004), and then photographed in a Zeiss Primo Star microscope fitted with an AxioCam ERc 5s camera and AxioVision 5.1 software to obtain morphometric measurements.…”

Ultrastructural description of Myxobolus cuneus (Myxosporea) in the skeletal muscle and kidney of tropical farmed fish Piaractus mesopotamicus (Characiformes: Characidae)

“…On the other hand, it reduces the possibility of correct identification of developmental stages of spores (Manrique et al 2013). Ultrastructural identification has been used to establish the similarities among the species (Matos et al 1999;Abdel-Ghaffar et al 2005) but comparatively few studies consider the histopathology to complement the myxozoan diagnosis and host consequences (Martins et al 1997;Ali et al 2002;Adriano et al 2005Adriano et al , 2006Adriano et al , 2009Campos et al 2011).…”