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[{"key": "dc.contributor.advisor", "value": "Marjom\u00e4ki, Timo", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Veneranta, Lari", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Palo, Riku", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-05-12T12:37:28Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-05-12T12:37:28Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2020", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/68950", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Erityisesti karussa ja kivisess\u00e4 Merenkurkussa pienetkin lis\u00e4\u00e4ntymiseen soveltuvat alueet, kuten fladat ja kluuvit, voivat olla merkitt\u00e4vi\u00e4 kev\u00e4tkutuisten kalojen, kuten Hauen (Esox lucius) ja ahvenen (Perca fluviatilis) poikastuotannon kannalta. T\u00e4ten niihin kohdistuvilla rakentamis- tai muokkaustoimenpiteill\u00e4 saattaa olla vaikutusta alueen kalakantoihin. Tutkimuksessa tarkasteltiin kahta erityyppist\u00e4 pienvesimuodostumaa etenkin hauen ja ahvenen lis\u00e4\u00e4ntymis- ja poikastuotantoalueina. Lis\u00e4ksi toisella kohteista selvitettiin VAKI-kalalaskurin soveltuvuutta kev\u00e4tkutuisten kalalajien kutuvaelluksen seurantaan. Tutkimuskohteiden kutukalaston rakennetta hauen ja ahvenen osalta selvitettiin nousukalapyynnin saalisotoksista. VAKI-kalalaskurin aineistoa verrattiin nousukalapyynnin saaliisiin, jotta pystyttiin p\u00e4\u00e4ttelem\u00e4\u00e4n laskurimenetelm\u00e4n soveltuvuutta nousukalam\u00e4\u00e4rien arviointiin. Poikasten esiintymist\u00e4, kasvua ja ulosvaellusta seurattiin erityisesti pienpoikasten pyyntiin kehitettyjen havaspyydysmenetelmien avulla. Kohteiden kutukalastojen rakenteessa havaittiin eroja ik\u00e4-, laji- ja sukupuolijakaumissa, joiden p\u00e4\u00e4teltiin johtuvan mm. sis\u00e4\u00e4nvaellusuomien rakenteellisista eroista sek\u00e4 hauelle soveltuvien lis\u00e4\u00e4ntymisalueiden puutteesta. T\u00e4m\u00e4 n\u00e4kyi my\u00f6s selke\u00e4n\u00e4 erona hauen poikastiheyksiss\u00e4 kohteiden v\u00e4lill\u00e4. VAKI-laskuriaineiston perusteella kutukalojen vaellusaktiivisuuteen vaikuttivat valon m\u00e4\u00e4r\u00e4 sek\u00e4 veden l\u00e4mp\u00f6tila. Laskurin todettiin kuitenkin olevan soveltumaton kev\u00e4tkutuisten kalojen tarkkojen nousum\u00e4\u00e4rien arviointiin. Vastakuoriutuneiden ahvenenpoikasten m\u00e4\u00e4r\u00e4t kohteiden avovesialueilla olivat suurimmillaan toukokuun j\u00e4lkimm\u00e4isell\u00e4 puoliskolla ja ahvenenpoikasten ulosvaellus oli kiivaimmillaan kes\u00e4kuun lopussa. Jotta kohteiden kalanpoikastuotannon m\u00e4\u00e4r\u00e4\u00e4 sek\u00e4 ulosvaelluksen dynamiikkaa voitaisiin arvioida tarkemmin, tulisi etenkin ajehaavipyynnin m\u00e4\u00e4r\u00e4\u00e4 ja intensiteetti\u00e4 lis\u00e4t\u00e4 mahdollisissa jatkotutkimuksissa. Tutkitut vesist\u00f6t soveltuvat p\u00e4\u00e4s\u00e4\u00e4nt\u00f6isesti hyvin kev\u00e4tkutuisten kalalajien lis\u00e4\u00e4ntymisalueiksi, mutta tietyt erot kohteiden fysikaalisissa ominaisuuksissa n\u00e4ytt\u00e4v\u00e4t vaikuttavan osaltaan siihen, millaiseksi kalaston rakenne alueella lopulta muodostuu.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "In barren and rocky Kvarken archipelago, even small spawning areas, such as flads and glos, can be important for the reproduction of spring-spawning fish such as Northern pike (Esox lucius) and European perch (Perca fluviatilis). Thus, strong alterations e.g. dredging of these water bodies may affect the fish stocks in the area. In this thesis, two different types of small water bodies were compared, especially as a reproduction area for pike and perch. In addition, in one of the sites we examined the suitability of the VAKI fish counter for monitoring spawning migration of spring-spawning fish species. The structure of the spawning stock of pike and perch in the two water bodies was examined from catch samples of migrating fish. The data from the VAKI fish counter was compared with catches to determine the suitability of the counter for estimating the numbers of migrating fish. The occurrence, growth and outmigration of the fish larvae and fry were monitored with the use of different kinds of mesh traps. Differences were found in the structure of the spawning stocks in terms of age, species and sex distribution between the two water bodies. It was concluded that the structural differences in the outflow channels and the lack of suitable spawning areas for pike were the key factors for these differences. This also resulted as a big difference in pike larval densities between the sites. According to the VAKI fish counter data, the migration activity of spawning fish was regulated by water temperature changes and light rhythm. However, the counter was found to be unsuitable for estimating the amounts of migrating spring-spawning fish. The number of newly hatched perch larvae in the open water areas of the sites was highest in the second half of May and the outmigration of perch fry peaked at the end of June. In any further study, the intensity of monitoring outmigrating fish should be increased for more accurate assessments of juvenile fish production and the dynamics of outmigration in such sites. In conclusion, the studied water bodies are well suited as spawning areas for spring-spawning fish. However, certain differences in the physical characteristics of the sites appear to have influence to the structure of the fish stocks in the area.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2020-05-12T12:37:28Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-05-12T12:37:28Z (GMT). No. of bitstreams: 0\n Previous issue date: 2020", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "76", "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": "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": "ajehaavi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kalalaskuri", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kutualue", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kutuvaellus", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "poikasnuotta", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Hauen (Esox lucius) ja ahvenen (Perca fluviatilis) lis\u00e4\u00e4ntyminen sek\u00e4 poikasten esiintyminen, kasvu ja ulosvaellus kahdessa Merenkurkun rannikon pienvesist\u00f6ss\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-202005123158", "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": "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": "", "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.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": "lis\u00e4\u00e4ntyminen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "rys\u00e4t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kluuvit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "fladat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ahven", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "hauki", "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": "poikaset", "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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