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Diseases of Aquatic Organisms

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DAO 143:129-138 (2021)  -  DOI: https://doi.org/10.3354/dao03563

Ichthyophonosis in Peruvian rainbow trout Oncorhynchus mykiss: identification of endemic areas using molecular and histopathological tools

Teresa Castro1, Leonel Mendoza2,3,*, Raquel Vilela3, Camila Vilela3, Enrique C. Mateo1

1Laboratorio de Patobiología Acuática, Dirección General de Investigaciones en Acuicultura, Instituto del Mar del Peru (IMARPE), Esquina Gamarra y General Valle s/n. Casilla Postal 22, Callao, Peru
2Department of Microbiology and Molecular Genetics, Michigan State University, 354 Farm Lane, 324 North Kedzie Hall East Lansing, Michigan 48824, USA
3Biomedical Laboratory Diagnostics, Michigan State University, 354 Farm Lane, 324 North Kedzie Hall, East Lansing, Michigan 4882, USA
*Corresponding author:

ABSTRACT: Ichthyophonus infection was first detected in Peruvian Oncorhynchus mykiss in 1986, but the occurrence of ichthyophonosis disease in the region is unknown. This study investigated the presence and distribution of Ichthyophonus sp. in Peruvian rainbow trout using traditional and DNA sequencing tools. Between 2007 and 2008, 205 rainbow trout from 13 hatcheries in the Mantaro river basin were examined for the presence of Ichthyophonus, and at that time only 3 farms were positive. This early study confirmed the presence of Ichthyophonus sp. in the Tranca Grande lagoon for the first time, at a prevalence of 50%. In 2012, examination of 240 trout from 24 fish farms in 2 Peruvian Departments found 9 infected farms. More recently, in 2018, Ichthyophonus sp. was found in Lake Titicaca, infecting a trout in the Ichu area (in the Department of Puno). Our molecular analysis of the infected trout showed that ichthyophonosis disease in the Peruvian trout was caused by Ichthyophonus sp. Clade C. The finding of this pathogen in Lake Titicaca should be an alert for nearby farms and entities dealing with fish of economic importance in the rivers of Peru.


KEY WORDS: Ichthyophonus hoferi · Ichthyophonosis · Rainbow trout · Lake Titicaca · Peru


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Cite this article as: Castro T, Mendoza L, Vilela R, Vilela C, Mateo EC (2021) Ichthyophonosis in Peruvian rainbow trout Oncorhynchus mykiss: identification of endemic areas using molecular and histopathological tools. Dis Aquat Org 143:129-138. https://doi.org/10.3354/dao03563

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