Ectoparasites of semi-intensively farmed tropical freshwater fish Piaractus mesopotamicus, Prochilodus lineatus and Colossoma macropomum in Brazil

aetiology branchie branquias brasil brazil ciliophora colossoma colossoma macropomum cryptobia dactylogyridae disease prevalence ectoparasites epidemiologia epidemiologie epidemiology etiologia etiologie exploitation agricole explotaciones agrarias farms fish culture fishes freshwater fishes gills ichthyophthirius mastigophora myxospora parasite parasites peau peces peces de agua dulce piaractus mesopotamicus piel (animal) piscicultura pisciculture poisson (animal) poisson d'eau douce prochilodus lineatus sao paulo skin trichodina