title: Impact of a caged-trout farm on parasites of Galaxias maculatus in Lake Moreno, southern Argentina.
abstract: The present study was conducted to determine the impact of a caged-trout farm on the helminth parasites of the wild fish puyen chico (Galaxias maculatus) in Lake Moreno, southern Argentina. Samples of water, fish (G. maculatus), and snails (Heleobia hatcheri) were taken at 4 sampling stations in January 2001. Wild fish were parasitized by 8 helminth species, all of which are endemic in the region; therefore, the farm did not introduce any helminth parasite to G. maculatus. Fish captured near the farm were not infected by the digenean Steganoderma szidati, whereas the abundance of the digenean Acanthostomoides apophalliformis in these fish was significantly lower than that in fish captured away from the farm. This lower abundance may be explained by the absence in this area of the snail H. hatcheri, the parasite's first intermediate host, because of the effect of sediments and ammonium produced by the farm. To our knowledge, this is the first study in the Americas linking fish-farm pollution to helminth parasites in wild fish.
authors.affiliation: Departamento de Acuicultura, CRUB, Universidad Nacional del Comahue, Quintral 1250, 8400 Bariloche, Argentina. jrevenga@bariloche.com.ar
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Revenga
authors.forename: Patricio F
authors.initials: PF
authors.lastname: Torres
authors.forename: Miguel
authors.initials: M
authors.lastname: Baiz
mesh_terms: D000818:Animals; D000835:Animals, Wild / Q000469:parasitology; D001118:Argentina / Q000453:epidemiology; D004777:Environment; D005393:Fish Diseases / Q000453:epidemiology* / Q000469:parasitology; D005398:Fisheries; D005618:Fresh Water / Q000737:chemistry; D006374:Helminthiasis, Animal / Q000453:epidemiology* / Q000469:parasitology; D036441:Osmeriformes / Q000469:parasitology*; D015995:Prevalence; D012908:Snails / Q000254:growth & development*; D014337:Trout / Q000469:parasitology