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[{"key": "dc.contributor.advisor", "value": "Karvonen, Anssi", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Janhunen, Matti", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Oinonen, Jukka", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2024-12-31T06:50:34Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2024-12-31T06:50:34Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2024", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/99219", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Populaatioiden eriytyminen ja pienentyminen voi johtaa niiden uhanalaistumiseen ja geneettisen monimuotoisuuden kaventumiseen. \u00c4\u00e4rimm\u00e4isen uhanalaisen Saimaan j\u00e4rvilohen (Salmo salar m. sebago) elinvoimaisuuden kohentamiseksi on tehty risteytyskokeiluja j\u00e4rvilohta geneettisesti monimuotoisempien merilohikantojen kanssa. T\u00e4ss\u00e4 tutkimuksessa selvitettiin vaikuttaako risteytys lohenpoikasten vaellusk\u00e4ytt\u00e4ytymiseen tai kalastettavuuteen. Lis\u00e4ksi tutkittiin muuttaako virikekasvatus tai loisinta risteytyksen vaikutuksia. Kokeet suoritettiin 2-vuotiailla j\u00e4rvilohilla ja Nevajoen merilohilla (Salmo salar L.) sek\u00e4 niiden keskin\u00e4isill\u00e4 risteymill\u00e4. Osa kaloista infektoitiin n\u00e4k\u00f6kyky\u00e4 heikent\u00e4v\u00e4ll\u00e4 Diplostomum pseudospathaceum -imumatoloisella ja osa virikekasvatettiin nelj\u00e4n kuukauden ajan monipuolistamalla kasvatusaltaiden olosuhteita. Vaelluskokeessa PIT-merkittyjen lohien smolttivaellusta havainnoitiin keh\u00e4antenneilla uoma-altaissa. Kalastuskokeessa kaloja pyydettiin vapav\u00e4linein tutkimusaltaista. Risteytys lis\u00e4si vaelluspoikasten eli smolttien vaellusaktiivisuutta. Risteymien vaellushuippu ajoittui puhtaiden kantojen vaellushuippujen v\u00e4liin, tukien k\u00e4sityst\u00e4 vaelluksen ajoittumisesta geneettisesti s\u00e4\u00e4deltyn\u00e4 ominaisuutena. Virikekasvatus laski lohien vaellusaktiivisuutta, aikaisti vaellushuippua ja lis\u00e4si pyydystett\u00e4vyytt\u00e4 verrattaessa standardikasvatukseen osoittaen, ett\u00e4 jopa lyhytkestoisella virikekasvatuksella voi olla kauaskantoisia vaikutuksia. Voimakkaasti loisitut kalat vaelsivat p\u00e4iv\u00e4saikaan kontrollikaloja enemm\u00e4n, kun y\u00f6ll\u00e4 vastaavaa ei havaittu. Heikentynyt n\u00e4k\u00f6kyky saattaa siten muuttaa lohen adaptiivista ominaisuutta vaeltaa y\u00f6ll\u00e4. Risteytyksell\u00e4 tai loisinnalla ei puolestaan ollut vaikutusta kalastettavuuteen. Infektoitujen lohien silmien kaihin peitt\u00e4vyydess\u00e4 ei my\u00f6sk\u00e4\u00e4n havaittu merkitsevi\u00e4 eroja risteytysryhmien v\u00e4lill\u00e4. Koska risteytys ei vaikuttanut merkitt\u00e4v\u00e4sti vaellusk\u00e4ytt\u00e4ytymiseen tai kalastettavuuteen, tulokset tukevat aiempaa k\u00e4sityst\u00e4 risteytyksen soveltuvuudesta j\u00e4rvilohen elinvoimaisuuden kohentamiseksi.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The diverging of the populations and the reduction of group size may lead to endangerment and a decrease in genetic diversity. A set of hybridization experiments with genetically more diverse Atlantic salmon have been conducted to improve vitality of the endangered Saimaa landlocked salmon (Salmo salar m. sebago). This study focuses on whether hybridization has affected migratory or catchability aspects of young salmon. An additional study investigates how rearing background, or parasitism affects the results of hybridization. The tests were conducted with 2-year-old landlocked salmon, Baltic anadromous salmon (Salmo salar L.) and their hybrids. Some fish were infected with an eye fluke (Diplostomum pseudospathaceum) which reduces its hosts vision, and some were also reared in enriched conditions for four months by diversifying the environment of the rearing tanks. Smolt migration of PIT-tagged salmons was observed in stream tanks with antennas. The catchability test was conducted by catching salmons with fishing rods from research tanks. Hybridization increased the migration abilities of the smolts. Migration peak of the hybrids appeared between the peaks of the purebred stocks, confirming the view that the timing of migration is dependent on genetical factors. Enriched rearing decreased migration activity, advanced the migration peak and increased the catchability compared to the standard group. This implies that even short time enrichment could have sustained effects. When comparing the control group to heavily infected fish, the latter migrated more during the daytime, but similar behavior was not observed at night. Thus, reduced vision could change the adaptive qualities of salmon to migrate at night. However, hybridization or infection had no effect on catchability. No significant differences were observed in the cataract coverage between the crossbreeding groups. Results reinforce the perception that hybridization is a suitable method for increasing the vitality of the Saimaa landlocked salmon by showing no significant effect for migration nor catchability.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2024-12-31T06:50:34Z\r\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2024-12-31T06:50:34Z (GMT). No. of bitstreams: 0\r\n Previous issue date: 2024", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "50", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "avustettu geenivirta", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "pullonkaulailmi\u00f6", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ristisiitosrasite", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Risteytyksen, virikekasvatuksen ja loisinnan vaikutus Saimaan j\u00e4rvilohen (Salmo salar m. sebago) vaellusk\u00e4ytt\u00e4ytymiseen ja kalastettavuuteen", "language": null, "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-202412318024", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "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": "Akvaattiset tieteet", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Aquatic sciences", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "public", "language": null, "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": null, "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "yvv.contractresearch.initiative", "value": "student", "language": null, "element": "contractresearch", "qualifier": "initiative", "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": "restrictedAccess", "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": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "atlantinlohi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "sukusiitos", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "lohi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "j\u00e4rvilohi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vaelluskalat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalanviljely", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalakannat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "geneettinen monimuotoisuus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalanistutus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "Tekij\u00e4 ei ole antanut lupaa avoimeen julkaisuun, joten aineisto on luettavissa vain Jyv\u00e4skyl\u00e4n yliopiston kirjaston arkistoty\u00f6semalta. Ks. https://kirjasto.jyu.fi/kokoelmat/arkistotyoasema..", "language": "fi", "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "The author has not given permission to make the work publicly available electronically. Therefore the material can be read only at the archival workstation at Jyv\u00e4skyl\u00e4 University Library (https://kirjasto.jyu.fi/collections/archival-workstation).", "language": "en", "element": "rights", "qualifier": "accessrights", "schema": "dc"}]
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