2014-11-052014-11-052009-02GARCIA, F. et al. Protozoan parasites of Xiphophorus spp. (Poeciliidae) and their relation with water characteristics. Arquivo Brasileiro de Medicina Veterinária e Zootecnia, Belo Horizonte, v. 61, n. 1, p. 156-162, fev. 2009. Disponível em: <http://www.scielo.br/pdf/abmvz/v61n1/v61n1a22.pdf>. Acesso em: 29 jul. 2014. <http://dx.doi.org/10.1590/S0102-09352009000100022>.0102-0935https://repositorio.ufpa.br/handle/2011/5998This work investigated the relationship between water characteristics and infestation of protozoan parasites, Icthyophthirius multifiliis and Trichodina sp., in swordtails (Xiphophorus helleri) and platy (Xiphophorus maculates) collected in an ornamental fish farm in São Paulo, Brazil. Fish were monthly collected from ponds and tanks for one year. The prevalence rates in fish from tanks and ponds were, respectively, 34.2% and 22.5% for I. multifiliis, and 13% and 54.2% for Trichodina sp. Increased electric conductivity and pH provoked reduction of I. multifiliis infestation. Low oxygen concentration increased Trichodina sp. infestation. The use of salt to increase the electric conductivity of water was a method to control I. multifiliis. Low dissolved oxygen and the addition of organic fertilizer favored the reproduction of Trichodina sp.engAcesso AbertoPeixe ornamentalPeixe-espadaXiphophorus helleriPlatiXiphophorus maculatusPoeciliidaeProtozoárioParasitosIctioparasitologiaInfecção parasitáriaIcthyophthirius multifiliisTrichodina sp.Artigo de Periódico