A New Species of Henneguya , a Gill Parasite of Astyanax altiparanae (Pisces: Characidae) from Brazil, with Comments on Histopathology and Seasonality

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 rang...

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Bibliographic Details
Published in:Memórias do Instituto Oswaldo Cruz 2003-09, Vol.98 (6), p.761-765
Main Authors: Barassa, Bianca, Cordeiro, Nelson S, Arana, Sarah
Format: Article
Language:English
Subjects:
Animals
Astyanax altiparanae
Brazil
Brazil - epidemiology
Characidae
Eukaryota - classification
Eukaryota - ultrastructure
Female
Fish Diseases - epidemiology
Fish Diseases - pathology
Fishes - parasitology
Fresh Water
Gills - parasitology
Henneguya
Henneguya chydadea sp. n
histopathology
Male
Microscopy, Electron
Myxosporea
Myxozoa
Myxozoa - Henneguya chydadea sp. n. - Astyanax altiparanae - histopathology - Brazil
PARASITOLOGY
Pisces
Prevalence
Protozoan Infections, Animal - epidemiology
Protozoan Infections, Animal - pathology
Seasons
TROPICAL MEDICINE
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Summary: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 μm x 64-80 μm 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 myxosporean parasitizing A. altiparanae.
ISSN:1678-8060
0074-0276
0074-0276
1678-8060
DOI:10.1590/S0074-02762003000600009