title: Occurrence of Diplostomum pseudospathaceum Niewiadomska, 1984 and D. mergi Dubois, 1932 (Digenea: Diplostomidae) in Danish freshwater snails: ecological and molecular data.
abstract: Freshwater pulmonate snails from three locations in Lake Furesø north of Copenhagen were screened for infection with furcocercariae (by shedding in the laboratory) and recovered parasite larvae were diagnosed by molecular methods (by performing PCR of rDNA and sequencing the internal transcribed spacer [ITS] region). Overall prevalence of infection in snails was 2%. Recovered cercariae from Lymnaea stagnalis (Linnaeus) were diagnosed as Diplostomum pseudospathaceum Niewiadomska, 1984 (prevalence 4%) and cercariae from Radix balthica (Linnaeus) as D. mergi (Dubois, 1932) (prevalence 2%). Pathogen-free rainbow trout were then exposed to isolated cercariae and infection success and site location of metacercariae in these fish were determined. Infection experiments confirmed that both species could infect rainbow trout with the eye lens as infection site for the metacercarial stage although infection success differed. Combination of molecular and biological assays may contribute to improvement of our knowledge on diagnosis, distribution and biology of diplostomids in fish.
authors.affiliation: Laboratory of Aquatic Pathobiology, Section of Biomedicine, Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg C, Denmark.
authors.forename: Simon
authors.initials: S
authors.lastname: Haarder
authors.forename: Kasper
authors.initials: K
authors.lastname: Jørgensen
authors.forename: Per Walter
authors.initials: PW
authors.lastname: Kania
authors.forename: Alf
authors.initials: A
authors.lastname: Skovgaard
authors.forename: Kurt
authors.initials: K
authors.lastname: Buchmann
mesh_terms: D000818:Animals; D001483:Base Sequence; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D003718:Denmark; D004463:Ecology; D005393:Fish Diseases / Q000469:parasitology* / Q000635:transmission; D005399:Fishes; D005618:Fresh Water / Q000469:parasitology; D060106:Lakes / Q000469:parasitology; D058488:Metacercariae; D008969:Molecular Sequence Data; D017686:Oncorhynchus mykiss / Q000469:parasitology*; D010802:Phylogeny; D016133:Polymerase Chain Reaction / Q000662:veterinary; D012621:Seasons; D017422:Sequence Analysis, DNA / Q000662:veterinary; D012908:Snails / Q000469:parasitology*; D013047:Specific Pathogen-Free Organisms; D014200:Trematoda / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D014201:Trematode Infections / Q000469:parasitology / Q000635:transmission / Q000662:veterinary*
chemical_list: D021903:DNA, Ribosomal Spacer