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Gill histopathology of Maria-da-toca Hypleurochilus fissicornis by metacercariae of Bucephalus margaritae (Digenea: Bucephalidae)

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Abstract

Gills of Maria-da-toca Hypleurochilus fissicornis collected at Ponta do Sambaqui–Florianópolis island–Brazil, were analyzed to describe the histopathology caused by metacercaria of Bucephalus margaritae. Gills were submitted to the routine histological techniques for embedding in paraffin and permanent mounting in Balsam and stereoscopic analysis. Metacercariae showed a branchial infection site pattern for encystations. The branchial infection site pattern is half-basalward in the primary branchial filament with amplitude of the infection of 1-3 metacercaria. Cysts occurred within branchial abductor muscle and cartilaginous and osseous tissues of the gills. Each metacercariae had a contentional hyaline parasitic capsule and melanin-like pigmentation. The half-apicalward region of the primary branchial filaments showed several dysplasia degrees, cartilage and osseous degeneration (pyknosis), thrombosis and immune exudated cells (mainly lymphocytes). Cytopathologies as thickening of the epithelium lining of the secondary branchial filaments were a response of the branchial infection site pattern of the metacercaria. Interlamellar obliteration and fusion of the lamellae due to the hypertrophy and hyperplasia of the epithelial lining as well as chloride cells occurred. Pyknosis of pillar cells and epithelial lining cells from the secondary branchial filaments were also present. Bucephalosis in H. fissicornis gills is no-hemorrhagic and no-fatal branchitis, but could compromises the gill functions and could permits the secondary opportunistic infections.

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Correspondence to Renato Z. Silva.

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Silva, R.Z., da Costa Marchiori, N., Magalhães, A.R.M. et al. Gill histopathology of Maria-da-toca Hypleurochilus fissicornis by metacercariae of Bucephalus margaritae (Digenea: Bucephalidae). J Parasit Dis 40, 295–299 (2016). https://doi.org/10.1007/s12639-014-0498-3

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  • DOI: https://doi.org/10.1007/s12639-014-0498-3

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