Prevalence, Intensity, and Phylogenetic Analysis of Henneguya Piaractus and Myxobolus Cf. Colossomatis from Farmed Piaractus Mesopotamicus in Brazil
Vol. 107: 129–139, 2013 DISEASES OF AQUATIC ORGANISMS Published December 12 doi: 10.3354/dao02668 Dis Aquat Org 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 Ueta1 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. mesopotam- icus 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, plac- ing 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.
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