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- W1972707587 abstract "The present study is part of an ongoing investigation into the characteristics of Myxozoan parasites of Brazilian freshwater fish and was carried out using morphology, histopathology and electron microscopy analysis. A new Myxosporea species (Henneguya pseudoplatystoma) is described causing an important reduction in gill function in the farmed pintado (a hybrid fish from a cross between Pseudoplatystoma corruscans and Pseudoplatystoma fasciatum), which is a commercially important South American catfish. From a total of 98 pintado juveniles from fish farms in the states of São Paulo and Mato Grosso do Sul (Brazil), 36 samples (36.7%) exhibited infection of the gill filaments. Infection was intense, with several plasmodia occurring on a same gill filament. The plasmodia were white and measured up to 0.5 mm in length; mature spores were ellipsoidal in the frontal view, measuring 33.2 ± 1.9 μm in total length, 10.4 ± 0.6 μm in body length, 3.4 ± 0.4 μm in width and 22.7 ± 1.7 μm in the caudal process. The polar capsules were elongated, measuring 3.3 ± 0.4 μm in length and 1.0 ± 0.1 μm in width and the polar filaments had six to seven turns. Histopathological analysis revealed the parasite in the connective tissue of the gill filaments and lamella. No inflammatory process was observed, but the development of the plasmodia reduced the area of functional epithelium. Ultrastructural analyses revealed a single plasmodial wall, which was in direct contact with the host cells and had numerous projections in direction of the host cells as well as extensive pinocytotic canals. A thick layer (2–6 μm) of fibrous material and numerous mitochondria were found in the ectoplasm. Generative cells and the earliest stage of sporogenesis were seen more internally. Advanced spore developmental stages and mature spores were found in the central portion of the plasmodia." @default.
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- W1972707587 date "2009-12-01" @default.
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- W1972707587 title "Henneguya pseudoplatystoma n. sp. causing reduction in epithelial area of gills in the farmed pintado, a South American catfish: Histopathology and ultrastructure" @default.
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- W1972707587 doi "https://doi.org/10.1016/j.vetpar.2009.07.034" @default.
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