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An outbreak of myxozoan parasites in farmed freshwater fishColossoma macropomum (Cuvier, 1818) (Characidae, Serrasalminae) inthe Amazon region, Brazil

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The tambaqui (Colossoma macropomum) is a native fish species that is farmed most frequently and in thelargest quantities throughout Brazil. The high production of this species from fish farms has contributedto the occurrence of emerging parasites, which may compromise fish health and productivity. In a batchof 2500 tambaqui fry acquired for experimental farming procedures in Brazil, a mortality rate of 80%was observed, with the fish swimming erratically and gasping for air at the water surface. From amongthe specimens that were still alive, 60 individuals were selected at random. Organs or fragments oforgans containing lesions and/or cysts were examined under an optical microscope to investigate for thepresence of parasitic spores. Of the 60 specimens of tambaqui analyzed, 83.3% were found to be infectedin different organs, such as the gills, liver, and gallbladder with myxosporidian species belonging to fourgenera, namely, Myxobolus, Ellipsomyxa, Henneguya and Thelohanellus. The parasite with the greatestprevalence was Myxobolus sp., located in the gills (70%), followed by Henneguya sp. in the gills region(68.3%), Myxobolus sp. in the liver (63.3%), Thelohanellus sp. in the liver (58.3%), and Ellipsomyxa in thegallbladder (50%). This is the first report of parasitic infection caused by the genera Ellipsomyxa andThelohanellus in C. macropomum. The present study reported the second incidence of the occurrence ofthe genus Thelohanellus in South America. This study suggested that the mortality among C. macropomumspecimens was caused by the outbreak of myxosporidians.

Keywords:AmazonTambaquiParasiteMyxozoaMyxosporidians

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Informasi Detail

Judul Seri

Aquaculture Reports

No. Panggil

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Penerbit

: Elsevier Science Inc.., 2016

Deskripsi Fisik

Aquaculture Reports 3 (2016) 31–34

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

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