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[{"key": "dc.contributor.advisor", "value": "Vesterinen, Jussi", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Marjom\u00e4ki, Timo", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Heikkinen, Salla", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2024-01-19T07:09:21Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2024-01-19T07:09:21Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2023", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/92891", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Lake En\u00e4j\u00e4rvi and Lake Poikkipuoliainen, located in Southern Finland, are eutrophicated and dominated by cyprinids. The lakes are connected to each other by a 2,3 km long River Hulttilanjoki, enabling fish to move between the lakes. The aim of this study was to define the age, growth and maturity of roach (Rutilus rutilus), white bream (Blicca bjoerkna) and bream (Abramis brama). Migration of these three species between the lakes was studied as well. Migration study was conducted by T-bar anchor tagging, meanwhile mortality caused by tagging and handling was studied. Age and growth determination were made from the cleithrum bones. In migration study, only 1,5 % (n = 18) out of all tagged individuals (n = 2178) moved from Lake Poikkipuoliainen to Lake En\u00e4j\u00e4rvi. Instead, the portion of returned tagged fish (n = 101) was 4,7 % out of all tagged fish. No differences in the mortality caused by tagging and handling between experimental and control groups of bream and white bream were discovered. Instead, the mortality rate of roach in experimental group was 2,2 %, but no mortality was noticed in control group. The growth of roach, bream and white bream was slow in case of both lakes, which is often typical for a lake suffering from dence cyprinid stocks. Management fishing had an effect on growth of some year classes, but no typical higher growth rates of management fishing were found in the long term. In Lake En\u00e4j\u00e4rvi, the growth of roach and white bream was faster than in Lake Poikkipuoliainen, where instead the stocks of roach and white bream was conducted of smaller-sized individuals. Growth of bream in both lakes has been slowed down, especially in younger age groups. Roach and white bream males reached sexual maturity at younger age in Lake En\u00e4j\u00e4rvi than in Lake Poikkipuoliainen. In Lake Poikkipuoliainen, male and female breams reached sexual maturity a year younger than in Lake En\u00e4j\u00e4rvi. The results on the age, growth, sexual maturity and movement of roaches in En\u00e4j\u00e4rvi and Poikkipuolainen provide important additional information for lake restoration and further planning of biomanipulation.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "L\u00e4nsi-Uudellamaalla sijaitsevat En\u00e4j\u00e4rvi ja Poikkipuoliainen ovat rehev\u00f6ityneit\u00e4 j\u00e4rvi\u00e4, joissa vallitsee runsas s\u00e4rkikalakanta. J\u00e4rvet ovat yhteydess\u00e4 toisiinsa 2,3 km pitk\u00e4n Hulttilanjoen kautta, mik\u00e4 mahdollistaa kalojen liikkumisen j\u00e4rvien v\u00e4lill\u00e4. Ty\u00f6n tarkoituksena oli selvitt\u00e4\u00e4 s\u00e4rjen (Rutilus rutilus), pasurin (Blicca bjoerkna) ja lahnan (Abramis brama) liikkumista, ik\u00e4rakennetta, kasvunopeutta sek\u00e4 sukukypsyysik\u00e4\u00e4 ja -kokoa. Vaellusselvitys toteutettiin T-ankkurimerkinn\u00e4ll\u00e4 merkint\u00e4-takaisinpyyntin\u00e4 ja merkinn\u00e4n aiheuttamaa kuolleisuutta tutkittiin kuolleisuuskokeella. I\u00e4n- ja kasvunm\u00e4\u00e4ritykset tehtiin hartialukkoluusta (cleithrum). Vaellustutkimuksessa molempien j\u00e4rvien yhteenlaskettujen merkkipalautuksien (n = 101) osuus oli 4,7 % kaikista merkityist\u00e4 kaloista (n = 2178). J\u00e4rvest\u00e4 toiseen vaeltaneita kaloja havaittiin vain 1,5 % (n = 18) kaikista merkityist\u00e4 kaloista. Vaeltaneiden kalojen osuus merkkipalautuksista puolestaan oli 17,8 %. Kuolleisuuskokeessa koeryhm\u00e4ss\u00e4 s\u00e4rjen kuolleisuus oli 2,2 %, mutta pasurilla ja lahnalla ei havaittu kuolleisuutta. Kontrolliryhm\u00e4ss\u00e4 kaikki kalat selvisiv\u00e4t hengiss\u00e4. S\u00e4rjen, pasurin ja lahnan kasvu oli molemmilla j\u00e4rvill\u00e4 hidasta, mik\u00e4 on tyypillist\u00e4 reheville s\u00e4rkikalakannaltaan tiheille j\u00e4rville. Hoitokalastusten havaittiin vaikuttaneen joidenkin lajien vuosiluokkiin, mutta hoitokalastukselle tyypillist\u00e4 kasvun selke\u00e4\u00e4 paranemista ei havaittu tapahtuneen pitk\u00e4ll\u00e4 aikav\u00e4lill\u00e4 kummallakaan j\u00e4rvell\u00e4. En\u00e4j\u00e4rvell\u00e4 s\u00e4rkien ja pasureiden havaittiin kasvavan kookkaammiksi ja vanhemmiksi kuin Poikkipuoliaisella, jossa s\u00e4rki- ja pasurikannat koostuivat nuoremmista ja pienikokoisemmista yksil\u00f6ist\u00e4 ik\u00e4-pituus-avaimella muutetun Nordic-verkkokoesaaliin ik\u00e4- ja pituusjakaumien mukaan. Lahnojen kasvu molemmilla j\u00e4rvill\u00e4 on hidastunut tarkastelujakson aikana, etenkin nuoremmissa ik\u00e4ryhmiss\u00e4. S\u00e4rkikoiraat saavuttivat sukukypsyyden 2\u20133-vuotiaina 8\u20139 cm pituisina ja s\u00e4rkinaaraat 3\u20134-vuotiaina 10\u201311 cm pituisina. Koiraspasurit tulivat sukukypsiksi 4\u20135-vuotiaina 9\u201312 cm pituisina ja naaraspasurit 6-vuotiaina 10\u201312 cm pituisina. Sukukypsyyden koiras- ja naaraslahnat saavuttivat 9\u201310-vuotiaina, jolloin pituutta niill\u00e4 oli 30\u201333 cm. Tulokset s\u00e4rkikalojen i\u00e4st\u00e4, kasvusta, sukukypsyydest\u00e4 sek\u00e4 liikkumisesta En\u00e4j\u00e4rvell\u00e4 ja Poikkipuoliaisella antavat t\u00e4rke\u00e4\u00e4 lis\u00e4tietoa j\u00e4rvien ravintoketjukunnostuksen jatkosuunnitteluun.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2024-01-19T07:09:21Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2024-01-19T07:09:21Z (GMT). No. of bitstreams: 0\n Previous issue date: 2023", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "63", "language": "", "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": "kuolleisuuskoe", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "merkint\u00e4-takaisinpyynti", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "pasuri", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "S\u00e4rkikalojen paikallisuus, ik\u00e4 ja kasvu Siuntionjoen latvaj\u00e4rvill\u00e4", "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-202401191387", "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": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Aquatic sciences", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Akvaattiset tieteet", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "community", "language": "", "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "yvv.contractresearch.initiative", "value": "business", "language": "", "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.copyright", "value": "\u00a9 The Author(s)", "language": null, "element": "rights", "qualifier": "copyright", "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": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ik\u00e4", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kasvu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "migraatio (biologia)", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "sukukypsyys", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "j\u00e4rvet", "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": "rehev\u00f6ityminen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vesist\u00f6t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "lahna", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalasto", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "s\u00e4rkikalat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vesist\u00f6jen kunnostus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "s\u00e4rki", "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"}]
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