title: Exposure to a mixture of zinc and copper decreases survival and fecundity of Discocotyle sagittata (Leuckart) parasitizing juvenile Atlantic salmon, Salmo salar L.
abstract: We assessed the effects of zinc and copper on freshwater monogenean ectoparasites (Discocotyle sagittata Leuckart) infecting juvenile Atlantic salmon (Salmo salar L.). Exposure to 47 microg/L zinc and 3 microg/L copper reduced survival and fecundity of adult D. sagittata, while egg hatching success was only reduced at high exposure concentrations (2704 microg/L zinc and 164 microg/L copper). Parasitized salmon had decreased plasma chloride, but this was negated in infected fish exposed to metals. No other effects on Atlantic salmon survival and physiology (plasma osmolality, hematocrit) were noted, suggesting that D. sagittata may be more susceptible to metal toxicity than its host fish.
authors.affiliation: Environment Canada, 105 McGill, Montréal, QC H2Y 2E7, Canada. chris.blanar@gmail.com
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Blanar
authors.forename: Deborah L
authors.initials: DL
authors.lastname: MacLatchy
authors.forename: Jim D
authors.initials: JD
authors.lastname: Kieffer
authors.forename: Kelly R
authors.initials: KR
authors.lastname: Munkittrick
mesh_terms: D000818:Animals; D003300:Copper / Q000633:toxicity*; D005298:Fertility / Q000187:drug effects; D005393:Fish Diseases / Q000469:parasitology*; D006790:Host-Parasite Interactions / Q000187:drug effects; D020317:Salmo salar / Q000254:growth & development / Q000469:parasitology* / Q000502:physiology; D014200:Trematoda / Q000187:drug effects* / Q000302:isolation & purification; D014201:Trematode Infections / Q000469:parasitology / Q000662:veterinary*; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D015032:Zinc / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical; D003300:Copper; D015032:Zinc