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[{"key": "dc.contributor.advisor", "value": "Tuhkanen, Tuula", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Lindholm-Lehto, Petra", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "J\u00e4ntti, Marko", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-04-03T05:04:14Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-04-03T05:04:14Z", "language": "", "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/123456789/68449", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Kiinnostus kiertovesilaitoksiin (RAS) on kasvamassa, koska niiss\u00e4 kalaa voidaan viljell\u00e4 ekologisesti optimaalisissa olosuhteissa ymp\u00e4ri vuoden. Ratkaistavana on kuitenkin joitain teknisi\u00e4 ongelmia, ennen kuin viljely on kannattavaa Suomessa. Ongelmat liittyv\u00e4t vedenlaadun yll\u00e4pit\u00e4miseen hyv\u00e4n\u00e4, sill\u00e4 liuenneet orgaaniset aineet (DOM) kertyv\u00e4t kiertoveteen heikent\u00e4en veden laatua. T\u00e4m\u00e4 tutkimus painottui DOM:n karakterisointiin korkean suorituskyvyn nestekromatografilla (HPLC-SEC) kokoekskluusiota, sek\u00e4 samanaikaisesti UV254 -absorbanssi ja fluoresenssi detektiota k\u00e4ytt\u00e4en. Tutkimusymp\u00e4rist\u00f6n\u00e4 toimi Luken Laukaalla sijaitseva kiertovesilaitos, josta kolmen RAS-yksik\u00f6n viikoittaisista vesin\u00e4ytteit\u00e4 analysoitiin kyseisell\u00e4 menetelm\u00e4ll\u00e4 orgaanisen aineen kertymist\u00e4. RAS-yksik\u00f6t 10, 8 ja 9 toimivat 250, 500 ja 750 L kg rehua-1 d-1 korvausveden m\u00e4\u00e4rill\u00e4 kokeen kest\u00e4ess\u00e4 105 p\u00e4iv\u00e4\u00e4. Tutkimuksen tavoitteena oli tutkia siikojen kasvua, DOM -komponenttien kertymist\u00e4 ja veden laatua n\u00e4iss\u00e4 erillisiss\u00e4 yksik\u00f6iss\u00e4. Tulokset osoittivat, ettei siikojen kasvussa ollut merkitt\u00e4v\u00e4\u00e4 eroa yksik\u00f6iden v\u00e4lill\u00e4. Typpiyhdisteiden: NH4- N+, NO2-N ja NO3-N, sek\u00e4 liuenneen orgaanisen hiilen (DOC) ja kokonaistypen (TN) konsentraatiot ja kaikkien tutkittujen DOM-komponenttien signaalit olivat kokeen lopussa suurimmat 10-yksik\u00f6ss\u00e4, jossa veden vaihtuvuus oli pienin. 8 ja 9 -yksik\u00f6iden v\u00e4lill\u00e4 erot olivat huomattavan pieni\u00e4, joissain tapauksissa tilastollisesti merkitsevi\u00e4. Yksik\u00f6iden vesin\u00e4ytteiden fluoresoivista yhdisteist\u00e4 suurin osa oli fulvohappomaisia, joka oli per\u00e4isin korvausvedest\u00e4. Tulokset viittaavat siihen, ett\u00e4 korvausveden suhteella 500 - 750 L kg rehua-1 d-1 toimivien yksik\u00f6iden puhdistussysteemi pystyi tehokkaasti puhdistamaan kiertovett\u00e4. Yksik\u00f6ss\u00e4 10, johon korvausvett\u00e4 lis\u00e4ttiin 250 L kg rehua-1 d-1, DOM- ja typpiyhdisteit\u00e4 kertyi kiertoveteen, mutta kokeen puoliv\u00e4liss\u00e4 kyseisen yksik\u00f6n puhdistusteho parani. DOM-komponenttien kertyminen saattaa lis\u00e4t\u00e4 riski\u00e4 patogeenien aiheuttamiin infektioihin ja siten lis\u00e4t\u00e4 kalakuolemia. On mahdollista, ett\u00e4 t\u00e4ysimittaisella kasvatuskaudella intensiivinen kasvatus pienell\u00e4 korvausveden m\u00e4\u00e4r\u00e4ll\u00e4 heikent\u00e4\u00e4 kalojen kasvua ja terveytt\u00e4. Mahdollisten makuvirheiden syntyminen intensiivisess\u00e4 RAS -yksik\u00f6ss\u00e4 tutkitaan t\u00e4h\u00e4n pro gradu -ty\u00f6h\u00f6n liittyv\u00e4ss\u00e4 tutkimuksessa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The recirculating aquaculture system (RAS) is a prominence ecological method to farm fish in optimal circumstances annually. Interest among this aquaculture form has increased recently, however, some technical problems must be solved before RAS could be taken to commercial fish production in Finland. These problems are related to water quality, dissolved organic matter (DOM) is known to accumulate to the system and weaken the water quality by increasing microbial activity and chemical and biological oxygen demand. The focus on this study was on characterizing DOM with size-exclusion high-performance liquid chromatography (HPLC-SEC) with fluorescence and absorbance detection from the weekly samples, of Laukaa\u2019s experimental RAS facility operated by Luke. The DOM-components studied were UVA254, tyrosine-, tryptophan-, humic- and fulvic acid-like fluorescence compounds, which were separated further to seven fractions with size exclusion -column. The experiment was ongoing for 105 days. The aim was to study European whitefish (Coregonus lavaretus) growth, DOM accumulation and different water quality parameters of the data of the experiment in three different RAS, 8, 9 and 10, where renewal water rates (RWR) were relatively 500, 750 and 250 L kg-1 feed . The results showed that there were no significant differences between fish growth studied by feed conversion rate (FCR) nor by specific growth rate (SGR) between the three RAS. Concentration of nitrogen compounds NH4-N+, NO2-N and NO3-N, and dissolved organic carbon (DOC), total nitrogen (TN) and signals of all DOM-components were significantly higher in RAS 10 at the end of the experiment, where the renewal water rate (RWR) was the smallest. DOM-components did not accumulate in RAS 8 and 9, but in RAS 10 accumulation was observed in all DOM-components. Tank water samples fluorescence compounds were formed in average of 55.1 \u00b1 0.6 % of fulvic acid-like, 21.5 \u00b1 0.3 % of tryptophan-like, 16 \u00b1 0.2 % of humic acid-like and 7.4 \u00b1 0.7 % of tyrosine-like compounds. This study suggests that there is no difference in whitefish growth between RWR of 250 - 750 L kg-1 feed in 105 days long period. When RWR is as low as 250 L kg-1 feed, accumulation of DOM, DOC, TN and nitrogen compounds occurs in RAS. That may increase risk of infection, or cause odor problems in fish meat. During a complete growing season, fish growth may decrease, due the worse water quality with intensive RAS system.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2020-04-03T05:04:14Z\r\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-04-03T05:04:14Z (GMT). No. of bitstreams: 0\r\n Previous issue date: 2020", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "102", "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.subject.other", "value": "Recirculating aquaculture system", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "whitefish", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "HPLC-SEC", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "chromatography", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "DOM", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "tryptophan", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "fulvic matter", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "humic matter", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "make-up water addition", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "renewal water ratio", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "characterization", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "organic compounds", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "fluorescence", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "fluoresenssi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "organic substances", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kiertovesilaitos", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kiertovesiviljely", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Organic matter characterization of circular water in recirculating aquaculture system", "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-202004032662", "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": 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