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dc.contributor.authorKärgenberg, Einar
dc.contributor.authorSandlund, Odd Terje
dc.contributor.authorThorstad, Eva Bonsak
dc.contributor.authorThalfeldt, Mart
dc.contributor.authorØkland, Finn
dc.contributor.authorKaasik, Ants
dc.contributor.authorTambets, Meelis
dc.identifier.citationEnvironmental Biology of Fishes. 2022, .en_US
dc.description.abstractLittle is known about the exact movement parameters of migratory cyprinids listed as conservation priorities. A northern population of predatory asp, listed on the Bern Convention Appendix III, was studied in a near natural lake–river ecosystem by tracking adult fsh tagged with acoustic transmitters for 32 months. Activity levels in terms of swimming speed, swimming distance and movement range were four times higher during the warmer part of the year (water temperatures>12–15 °C, April/May–September), which coincides with their main feeding period, than other times of the year. All fsh had an annual riverine movement range larger than 40 km (max 110 km). Asp activity was afected by light, habitat type and water discharge. For most of the year, activity levels, in terms of number of movements per time unit, were higher during dawn and dusk than during day and night. Under poor light conditions and low temperatures, activity was also relatively high during the day. Fish were more likely to swim upstream around sunrise or during the day than during other diel periods. Knowledge about highactivity periods, which may render the fsh vulnerable to fshing and other impacts, can be used to develop and evaluate fshing regulations. Large annual movement ranges highlight the need for extensive continuous river systems open for migration between essential habitats. This study emphasises the need for region-specifc research on the ecology and behaviour of fsh populations in order to facilitate protection of the populations in the face of negative human impacts.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectAcoustic telemetryen_US
dc.subjectFish behaviouren_US
dc.titleAnnual and diel activity cycles of a northern population of the large migratory cyprinid fish asp (Leuciscus aspius)en_US
dc.title.alternativeAnnual and diel activity cycles of a northern population of the large migratory cyprinid fish asp (Leuciscus aspius)en_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2022 The Authorsen_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.source.journalEnvironmental Biology of Fishesen_US
dc.relation.projectEU:EU Life+Programmeen_US
dc.relation.projectAndre: Estonian Environmental Investment Centre (LIFE+07 NAT/EE/00)en_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal