DAO 107:129-139 (2013)  -  DOI: https://doi.org/10.3354/dao02668

Prevalence, intensity, and phylogenetic analysis of Henneguya piaractus and Myxobolus cf. colossomatis from farmed Piaractus mesopotamicus in Brazil

Maria Isabel Müller1,*, Edson Aparecido Adriano1,2, Paulo Sérgio Ceccarelli3, Marcia Ramos Monteiro da Silva4, Antonio Augusto Mendes Maia4, Marlene Tiduko Ueta

1Department of Animal Biology, Institute of Biology, Universidade Estadual de Campinas, Rua Monteiro Lobato, 255, CEP: 13083-862, Campinas, SP, Brazil
2Department of Biological Sciences, Universidade Federal de São Paulo, CEP: 09972-270, Diadema, SP, Brazil
3National Research and Conservation Center for Continental Fish, Instituto Chico Mendes de Conservação da Biodiversidade, CEP: 13630-970, Pirassununga, SP, Brazil
4Department of Basic Sciences, Faculty of Animal Science and Food Engineering, Universidade de São Paulo, CEP: 13635-900, Pirassununga, SP, Brazil

ABSTRACT: Henneguya piaractus and Myxobolus colossomatis (Myxosporea: Myxobolidae) are commonly found in the characid Piaractus mesopotamicus, an important fish farm species in Brazil. This paper describes the prevalence, mean intensity, molecular phylogeny, ultrastructure, and histology of H. piaractus and M. cf. colossomatis found infecting specimens of P. mesopotamicus collected from fish farms in the state of São Paulo, Brazil. A total of 278 fish were collected from 3 fish farms between February 2008 and July 2010. Parasite prevalence and mean intensity varied throughout the study period, and according to location and year. A phylogenetic tree, placing South American species in a global context, showed a clear tendency among myxosporean species to cluster according to host families. Ultrastructural analysis for M. cf. colossomatis showed the plasmodial wall with numerous projections toward host cells and phagocytic activity. Histopathological data showed hyperplasia caused by H. piaractus in highly infected fish. Histological and ultrastructural analysis of H. piaractus showed results similar to those that have previously been reported.


KEY WORDS: Piaractus mesopotamicus · Henneguya piaractus · Myxobolus cf. colossomatis · Ultrastructure · Phylogeny · São Paulo


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Cite this article as: Müller MI, Adriano EA, Ceccarelli PS, Silva MRM, Maia AAM, Ueta MT (2013) Prevalence, intensity, and phylogenetic analysis of Henneguya piaractus and Myxobolus cf. colossomatis from farmed Piaractus mesopotamicus in Brazil. Dis Aquat Org 107:129-139. https://doi.org/10.3354/dao02668

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