Henneguya chydadea check for this species in other resources sp. n. - Astyanax altiparanae check for this species in other resources - histopathology - Brazil"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 98, No. 6, 2003, pp. 761-765
Bioline Code: oc03155
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 98, No. 6, 2003, pp. 761-765

 en A New Species of Henneguya check for this species in other resources , a Gill Parasite of Astyanax altiparanae check for this species in other resources (Pisces: Characidae) from Brazil, with Comments on Histopathology and Seasonality
Bianca Barassa; Nelson S Cordeiro & Sarah Arana

Abstract

A new species of Myxosporea, Henneguya chydadea check for this species in other resources , is described parasitizing the gills of Astyanax altiparanae check for this species in other resources 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.

Keywords
Myxozoa - Henneguya chydadea check for this species in other resources sp. n. - Astyanax altiparanae check for this species in other resources - histopathology - Brazil

 
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