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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03563

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

    Teresa Castro, Leonel Mendoza*, Raquel Vilela, Camila Vilela, Enrique C. Mateo

    *Corresponding author:

    ABSTRACT: Although Ichthyophonus infection was first described in 1986 in Peruvian Oncorhynchus mykiss, its real occurrence is unknown. This study investigates the presence and distribution of Ichthyohonus 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 studied for the presence of Ichthyophonus, only three farms were positive. This early study for the first time showed the presence of Ichthyophonus sp. in the Tranca Grande lagoon, with a 50% prevalence. In 2012, examination of 240 trout from 24 fish farms in two Peruvian departments found nine infected farms. Recently, in 2018 Ichthyophonus sp. was found in Lake Titicaca, infecting a trout in the Ichu area (Department of Puno). The finding of this pathogen in Lake Titicaca should alert nearby farms and entities dealing with fish of economic importance in rivers of Peru. Our molecular analysis of infected trout showed that the disease ichthyophonosis in Peru is caused by Ichthyophonus sp. clade C.