Brachygalaxias bullocki (Regan, 1908) is a fish species endemic to Chile, and its distribution is restricted from Concepción to Chiloé Island. A survey conducted during January 2007, involving 26 fish from the Maullín River in Southern Chile, shows that infracommunities richness ranged from 0 to 5 with a mean species richness of 2.3 (SD = 1.3). Nine species of parasites were recorded, and 8 constitute new records of parasites for B. bullocki: Ichthyophthirius sp., Trichodina sp., Epistylididae, Myxobolus sp., Myxidium sp., Tylodelphys sp., Stephanoprora uruguayense, and Diplodon chilensis.
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