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[{"key": "dc.contributor.advisor", "value": "Taskinen, Jouni", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Pulkkinen, Katja", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Chowdhury, Motiur", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Roy, Amitav", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-06-26T06:05:13Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-06-26T06:05:13Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2019", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/64849", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Flavobacterium columnare on bakteeri, joka aiheuttaa kaloissa ns. l\u00e4mpim\u00e4n veden tautia (kolumnaris-tauti), mik\u00e4 puolestaan aiheuttaa kuolleisuutta kalais\u00e4nniss\u00e4\u00e4n. Erityisesti Pohjois-Euroopan alueella kes\u00e4aikana veden l\u00e4mp\u00f6tilan ollessa korkea t\u00e4m\u00e4 bakteeri voi olla hyvin haitallinen. Koska tautia vastaan ei ole toimivaa rokotetta, on antibioottien k\u00e4ytt\u00f6 ainoa keino taudin haittojen v\u00e4hent\u00e4miseksi kalanviljelylaitoksilla, mik\u00e4 voi johtaa antibioottiresistenssin kehittymiseen. Kolumnaris-taudin kohteena olevat lohikalat ovat my\u00f6s jokihelmisimpukan eli raakun is\u00e4nt\u00e4kaloja, joten F. columnaren ja raakun glokidium-toukkien yhteisinfektio esimerkiksi taimenessa on mahdollinen. Yleens\u00e4 aiempi loisinfektio lis\u00e4\u00e4 alttiutta uusille infektioille. Raakun glokidium-infektion on todettu haittaavan kalais\u00e4nt\u00e4\u00e4 esimerkiksi vaikeuttamalla hengityst\u00e4 ja alentamalla kalan kasvua. Tutkin t\u00e4ss\u00e4 ty\u00f6ss\u00e4 raakun glokidium-infektion vaikutusta taimenen alttiuteen kolumnaris.-taudille\u2014tutkimushypoteesi ollessa, ett\u00e4 raakkuinfektio lis\u00e4\u00e4 kalan alttiutta F. columnare -taudille. Raakun glokidium-toukilla laboratoriossa infektoidut (ja infektoimattomat kontrolliyksil\u00f6t) altistettiin virulentille F. columnare \u2013kannalle ja seurattiin kalojen elossapysymist\u00e4. Kahdenkymmenenyhdeks\u00e4n tunnin tarkkailujakson aikana kaikki bakteerille altistetut kalat (n = 150) kuolivat, kun altistamattomista vain yksi menehtyi (n = 146). Bakteeri-altistettujen kalojen joukossa glokidium-infektoitujen yksil\u00f6iden elinaika oli tilastollisesti merkitsev\u00e4sti pidempi kun ei-infektoitujen kontrollikalojen elinaika. Bakteeri-altistuneista kaloista ne infektoitiin FPM-glokidialla ennen kuin altistus s\u00e4ilyi tilastollisesti merkitt\u00e4v\u00e4sti pitemp\u00e4\u00e4n - sek\u00e4 pian (kaksi kuukautta) FPM-infektion (liitteen\u00e4 glochidia) j\u00e4lkeen ett\u00e4 14 kuukautta infektion j\u00e4lkeen (glochidia irrotettu).Lis\u00e4ksi j\u00e4lkimm\u00e4isess\u00e4 ryhm\u00e4ss\u00e4 glokidium-toukkien lukum\u00e4\u00e4r\u00e4n ja elossapysymisajan v\u00e4lill\u00e4 oli tilastollisesti merkitsev\u00e4, positiivinen korrelaatio. Mekanismia alentuneen kuolevuuden taustalla glokidium-infektoiduilla kaloilla ei tunneta, eik\u00e4 sit\u00e4 onko kyseess\u00e4 pelk\u00e4st\u00e4\u00e4 raakun toukille ominainen ilmi\u00f6. Tulos viittaa siihen, ett\u00e4 jokihelmisimpukan glokidium-toukkainfektio muokkaa kalan alttiutta kolumnaris-taudille aikana ja jopa alentaa F. columnare -bakteerin haitallisuutta taimenessa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Freshwater Pearl Mussel (FPM) Margaritifera margaritifera glochidia is an obligatory gill parasite to its salmonid host, brown trout (Salmo trutta). In general, it has been reported that parasiteic infections usually increase its host\u00b4s susceptibility to other secondary infections including bacterial infection. Flavobacterium columnare is a bacterium agent causing warm water disease (columnaris disease) in fish, which can result in a high mortality in fish populations at fish farms. Especially, in the northern Europe region, in the summer time with higher temperature this bacterium can be lethal to young salmonids. Therefore, in this study it was hypothesized that FPM glochidia will increase the mortality of its salmonid host during the co-infection with F. columnare. I exposed experimentally FPM-infected (glochidia attached and detached) and uninfected (control) brown trout (Salmo trutta) to a virulent F. columnare strain and measure survival time of fish. In an observation period of 29 hours, all the bacterium-exposed fish (n = 150) died while only one of the unexposed individuals (n =146) was dead. Among the bacterium-exposed fish, those were infected with FPM glochidia before the exposure survived statistically significantly longer\u2014both shortly (two months) after the FPM infection (glochidia attached) and 14 months after the infection (glochidia detached). In addition, in the latter fish group, there was a statistically significant, positive correlation between FPM glochidia number and survival time of fish. The mechanism of lowered mortality among the FPM-infected fish, or whether the effect is FPM specific, is not known. However, these results suggest that the brown trout-F. columnare relationship can be modified by previous FPM infection, and possibly even decrease the virulence of F. columnare in brown trout.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2019-06-26T06:05:13Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-06-26T06:05:13Z (GMT). No. of bitstreams: 0\n Previous issue date: 2019", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "33", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.title", "value": "Effect of freshwater pearl mussel (Margaritifera margaritifera) infection on virulence of flavobacterium columnare in brown trout (Salmo trutta)", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201906263444", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Master's Degree Programme in Sustainable management of Inland Aquatic Resources", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Master's Degree Programme in Sustainable management of Inland Aquatic Resources", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4012", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "infektiot", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "taimen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "virulenssi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "bakteerit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "jokihelmisimpukka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "infections", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "trout", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "virulence", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "bacteria", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Margaritana margaritifera", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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