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dc.contributor.authorAhonen, Hanna
dc.date.accessioned2017-06-06T06:41:28Z
dc.date.available2017-06-06T06:41:28Z
dc.date.issued2017
dc.identifier.isbn978-951-39-7109-0
dc.identifier.otheroai:jykdok.linneanet.fi:1703011
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/54309
dc.description.abstractFish parasites may potentially harm fisheries and aquaculture. Infected fish are unusable, even though they would not pose a direct risk to human health. The aim of this thesis was to investigate the ecology and epidemiology of three previously unknown or poorly known spore-forming parasites infecting muscles of economically important fish species. The first novel microsporidian species, here described as Microsporidium luciopercae, was found from pike-perch (Sander lucioperca) and European perch (Perca fluviatilis) and formed opaque-looking patches in the muscles. The second novel microsporidian species, Myosporidium spraguei, was found from pike-perch and burbot (Lota lota) and occurred within xenomas in the musculature. The third muscle-dwelling parasite, Henneguya zschokkei (Cnidaria), formed white plasmodia in the muscle of whitefish (Coregonus lavaretus). Among the six study lakes, the prevalence of M. luciopercae in wild pike-perch and perch varied from 0 to 1 %, while M. spraguei was more common (prevalence of 5–26 % in pike-perch and 65 % in burbot). M. spraguei was strongly aggregated and most abundant in the middle-sized (37–45 cm) pike-perch and in larger burbot (> 35 cm), but the infection was not related to host sex, sampling season or host condition. In the case of H. zschokkei, in two inland fish farms, one year-old whitefish were virtually uninfected, but the prevalence of infection was higher in 2 and 3 year old fish (up to 36 % of 3 year old fish were infected). New infections appeared seasonally in July-August. Neither the size of plasmodia nor the proportion of different plasmodium types changed from 2 to 3 year old fish, suggesting slow development of H. zschokkei in whitefish. However, the proportion of infected fish with melanised plasmodia increased with fish age, suggesting an age-dependent host response against this strongly aggregated parasite.
dc.format.extent1 verkkoaineisto (60 sivua) : kuvitettu, karttoja
dc.language.isoeng
dc.publisherUniversity of Jyväskylä
dc.relation.ispartofseriesJyväskylä studies in biological and environmental science
dc.relation.isversionofYhteenveto-osa ja 4 eripainosta julkaistu myös painettuna.
dc.subject.otherparasitism
dc.subject.otherhost-parasite relationship
dc.subject.otherfishery
dc.subject.otheraquaculture
dc.subject.otherMyosporidium sparguei
dc.subject.otherMicrosporidium luciopercae
dc.subject.otherHenneguya zschokkei
dc.titleSpore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology
dc.typeDiss.fi
dc.identifier.urnURN:ISBN:978-951-39-7109-0
dc.type.dcmitypeTexten
dc.type.ontasotVäitöskirjafi
dc.type.ontasotDoctoral dissertationen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Mathematics and Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineAkvaattiset tieteetfi
dc.relation.issn1456-9701
dc.relation.numberinseries332
dc.rights.accesslevelopenAccessfi
dc.subject.ysokalat
dc.subject.ysoloiset
dc.subject.ysoitiöt
dc.subject.ysoparasitismi
dc.subject.ysoinfektiot
dc.subject.ysokalataudit
dc.subject.ysovesiviljely (kalatalous)
dc.subject.ysokalanviljely
dc.subject.ysosienet
dc.subject.ysopolttiaiseläimet


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