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1.
Parasitol Res ; 110(2): 887-94, 2012 Feb.
Article in English | MEDLINE | ID: mdl-21842391

ABSTRACT

Henneguya azevedoi n. sp. is described from the piava (Leporinus obtusidens). Between 2005 and 2007, 60 fish were collected from the Mogi-Guaçu River near Cachoeira de Emas Falls located in the municipality of Pirassununga, state of São Paulo, Brazil. A total of 70% had plasmodia of the parasite. The plasmodia were white, spherical, and measured 40-200 µm in diameter. Histopathological analysis revealed that the development of the parasite was intralamellar and caused stretching of the epithelium, with accentuated deformation, as well as compression of the capillary and adjacent tissues. Ultrastructural analysis revealed that the wall of the plasmodium was a single membrane in direct contact with the host cells and contained pinocytic canals that extended into the plasmodium. The development of the parasite was asynchronous, with the earliest stages at the periphery and mature spores in the central region. Mature spores were elongated in the frontal view [mean ± standard deviation (range)]: 45.2 ± 0.6 (45.0-47.0) µm in total length, 10.0 ± 0.07 (9.9-10.2) µm in body length, 35.6 ± 0.9 (34.9-36.5) µm in caudal process length, and 4.4 ± 0.4 (4.0-5.0) µm in body width. The polar capsules were elongated and equal in size: 3.8 ± 0.3 (3.5-4.0) µm in length and 1.0 µm in width. The polar filaments were coiled in six to seven turns and perpendicular to the axis of the capsule. Scanning electron microscopy revealed smooth valves and a conspicuous rim around the spore body. This is the first time that a myxosporean has been reported in L. obtusidens.


Subject(s)
Characiformes/parasitology , Fish Diseases/parasitology , Gills/parasitology , Host-Parasite Interactions , Myxozoa/cytology , Myxozoa/pathogenicity , Parasitic Diseases, Animal/parasitology , Animals , Brazil , Fish Diseases/pathology , Histocytochemistry , Microscopy, Electron , Myxozoa/ultrastructure , Parasitic Diseases, Animal/pathology , Rivers
2.
Mem Inst Oswaldo Cruz ; 98(6): 761-5, 2003 Sep.
Article in English | MEDLINE | ID: mdl-14595452

ABSTRACT

A new species of Myxosporea, Henneguya chydadea, is described parasitizing the gills of Astyanax altiparanae collected from a lake on Rio das Pedras farm near Campinas, state of São Paulo, Brazil. Of the fish examined, 88.3% had gills parasitized by myxosporeans. The prevalence of the parasite ranged from 80% in the spring and fall, 93% in the summer and 100% in the winter. The parasite induced the formation of white, oval-shaped cysts measuring 40-64 microm x 64-80 microm which deformed the gill lamellae, compressed the capillaries, and caused retraction of the neighboring lamellae. The mature spores were elongated and had two identical, parallel elongate polar capsules. Each capsule contained a polar filament with 9-10 turns. There was no mucous envelope or iodinophilous vacuole. Morphometric differences between this parasite and other species of the genus Henneguya indicated, that the parasite observed in A. altiparanae is a new species. This is the first report of a myxosporeanparasitizing A. altiparanae.


Subject(s)
Eukaryota/ultrastructure , Fish Diseases/epidemiology , Fishes/parasitology , Gills/parasitology , Protozoan Infections, Animal/epidemiology , Animals , Brazil/epidemiology , Eukaryota/classification , Female , Fish Diseases/pathology , Fresh Water , Male , Microscopy, Electron , Prevalence , Protozoan Infections, Animal/pathology , Seasons
4.
Mem. Inst. Oswaldo Cruz ; 98(6): 761-765, Sept. 2003. ilus, tab
Article in English | LILACS | ID: lil-348344

ABSTRACT

A new species of Myxosporea, Henneguya chydadea, is described parasitizing the gills of Astyanax altiparanae collected from a lake on Rio das Pedras farm near Campinas, state of Säo Paulo, Brazil. Of the fish examined, 88.3 percent had gills parasitized by myxosporeans. The prevalence of the parasite ranged from 80 percent in the spring and fall, 93 percent in the summer and 100 percent in the winter. The parasite induced the formation of white, oval-shaped cysts measuring 40-64 æm x 64-80 æm which deformed the gill lamellae, compressed the capillaries, and caused retraction of the neighboring lamellae. The mature spores were elongated and had two identical, parallel elongate polar capsules. Each capsule contained a polar filament with 9-10 turns. There was no mucous envelope or iodinophilous vacuole. Morphometric differences between this parasite and other species of the genus Henneguya indicated, that he parasite observed in A. altiparanae is a new species. This is the first report of a myxosporeanparasitizing A. altiparanae


Subject(s)
Animals , Male , Female , Eukaryota , Fish Diseases , Fishes , Gills , Protozoan Infections, Animal , Brazil , Eukaryota , Fish Diseases , Fresh Water , Microscopy, Electron , Prevalence , Protozoan Infections, Animal , Seasons
5.
Lecta-USF ; 18(1): 65-73, jan.-jun. 2000. tab, graf
Article in Portuguese | LILACS | ID: lil-299886

ABSTRACT

Foram analisadas, para comparação qualitativa, 75 amostras fecais pelos métodos de centrífugo-flutuação em sulfato de zinco e centrífugo-sedimentação em formol-éter, preconizados respectivamente por Faust e cols. e pr Ritchie. Nesse último utilizou-se como alternativa o acetato de etila. Os dados obtidos demostraram que a técnica proposta por Ritchie mostra-se mais sensível à detecção de cistos de protozoários e igualmente sensível a ovos pouco densos de helmintos do que a técnica proposta por Faust e cols. Apresenta ainda outras vantagens como fixação do material, menor tempo de preparação, execução simples, análise microscópica que pode ser realizada algum tempo após a preparação, custo equivalente e maior concentração de organismos. O acetato de etila, quando comparado com o éter etílico na técnica de Ritchie, demonstrou ser um bom substituto, pois além de apresentar a mesma eficácia na concentração de formas parasitárias, é um produto mais adequado para trabalhos em laboratórios.


Subject(s)
Ether , Feces , Diagnostic Techniques and Procedures , Centrifugation/methods , Eukaryota , Parasitic Diseases , Laboratory Chemicals/administration & dosage
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