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Diseases of Aquatic Organisms

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DAO 154:7-14 (2023)  -  DOI:

Myxobolus lentisuturalis infection in a farmed population of goldfish Carassius auratus from the USA

Caitlin M. Hepps Keeney1,*, Thomas B. Waltzek2, Pedro H. de Oliveira Viadanna2, Salvatore Frasca Jr.3, Emily Reinhardt3, Jan Lovy4, Gregory A. Lewbart1

1Department of Clinical Sciences, North Carolina State University College of Veterinary Medicine, Raleigh, NC 27607, USA
2Department of Infectious Diseases and Pathology, University of Florida College of Veterinary Medicine, Bldg #1379, Mowry Road, Gainesville, FL 32610, USA
3Department of Pathobiology and Veterinary Science, University of Connecticut, 61 North Eagleville Road, Unit 3089, Storrs, CT 06269, USA
4New Jersey Department of Environmental Protection, Fish & Wildlife, Office of Fish & Wildlife Health & Forensics, 605 Pequest Rd, Oxford, NJ 07863, USA
*Corresponding author:

ABSTRACT: Myxobolus lentisuturalis is a myxozoan parasite of piscine muscle that has been described in goldfish Carassius auratus and Prussian carp Carassius gibelio. This report documents a naturally occurring infection of M. lentisuturalis in a population of farmed goldfish in the USA. Postmortem examination was performed on 4 affected goldfish. Gross findings included large cystic cavities along the dorsal midline filled with caseous exudate. Histopathology revealed myxozoan plasmodia and spores in the epaxial muscles with varying degrees of granulomatous and necrotizing myositis accompanied by lymphohistiocytic meningoencephalitis. Spore morphology and dimensions were consistent with M. lentisuturalis, as observed by light microscopy. PCR and sequence analysis of the small subunit ribosomal DNA of infected muscle samples from 2 goldfish confirmed the parasite to have 99-100% nucleotide identity to M. lentisuturalis sequences recovered from similar cases of this parasite infecting goldfish in China and Italy and Prussian carp in China. This is the first reported case of M. lentisuturalis in the USA and furthers the understanding of the pathogenicity of this under-described parasite.

KEY WORDS: Myxobolus lentisuturalis · Goldfish · Carassius auratus · Myxozoan · Myositis

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Cite this article as: Hepps Keeney CM, Waltzek TB, de Oliveira Viadanna PH, Frasca Jr S, Reinhardt E, Lovy J, Lewbart GA (2023) Myxobolus lentisuturalis infection in a farmed population of goldfish Carassius auratus from the USA. Dis Aquat Org 154:7-14.

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