Browsing NTNU Open by Author "Eldøy, Sindre Håvarstein"
Now showing items 1-20 of 26
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A comparison of life history and biological characters between Atlantic salmon first-time and repeat spawners in two Norwegian rivers
Jacobsen, Marit Melby (Master thesis, 2023)Iteroparitet er en avveiningsstrategi mellom nåværende og fremtidig reproduksjon. Risikoen for svikt i reproduksjonen er spredt over tid dersom fisken kan overleve sin første gyting og gyte igjen på et senere tidspunkt. ... -
Acoustic accelerometer transmitters and their growing relevance to aquatic science
Lennox, Robert; Eldøy, Sindre Håvarstein; Dahlmo, Lotte Svengård; Matley, Jordan K.; Vollset, Knut (Peer reviewed; Journal article, 2023)There has recently been great interest in the use of accelerometers onboard electronic transmitters to characterise various aspects of the ecology of wild animals. We review use cases and outline how these tools can provide ... -
The Biology and feeding Ecology of Arctic charr in the Kerguelen Islands
Eldøy, Sindre Håvarstein; Davidsen, Jan Grimsrud; Vignon, Matthias; Power, Michael (Peer reviewed; Journal article, 2020)Subsequent to their introduction in the 1950s, Arctic charr Salvelinus alpinus have been able to establish a self‐sustaining population that has adapted to the unique conditions of the sub‐Antarctic Kerguelen Islands. Here, ... -
Brown trout (Salmo trutta L. 1758) and Arctic charr (Salvelinus alpinus (L. 1758)) display different marine behaviour and feeding strategies in sympatry
Davidsen, Jan Grimsrud; Halvorsen, Andrine Emilie; Eldøy, Sindre Håvarstein; Thorstad, Eva Bonsak; Vøllestad, Leif Asbjørn (Peer reviewed; Journal article, 2023)Brown trout (Salmo trutta L. 1758) and Arctic charr (Salvelinus alpinus (L. 1758)) tagged with acoustic transmitters migrated from freshwater to the sea mainly in May and June, but with large individual variation in migration ... -
Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming
Eldøy, Sindre Håvarstein; Ryan, Diarmuid; Roche, William; Thorstad, Eva Bonsak; Næsje, Tor; Sjursen, Aslak Darre; Gargan, Paddy; Davidsen, Jan Grimsrud (Peer reviewed; Journal article, 2020)Marine growth has strong implications for reproductive potential and ultimate fitness of sea trout. Hence, the effects of anthropogenic factors on marine growth are important when evaluating population responses and ... -
Comparing migratory behavior and habitat use during seaward migration of Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) post-smolts in and outside the protected national salmon fjord Beiarfjorden.
Lange, Rasmus Rødne (Master thesis, 2024)Sjøvandringen utgjør en sårbar del av livshistorien i smoltfasen hos atlanterhavslaks (Salmo salar) og brunørret (Salmo trutta). I tillegg til en allerede høy dødelighet for førstegangsvandrere i de tidlige stadiene av ... -
The effects of nutritional state, sex and body size on the marine migration behaviour of sea trout
Eldøy, Sindre Håvarstein; Bordeleau, Xavier; Lawrence, M. J.; Thorstad, Eva B.; Finstad, Anders Gravbrøt; Whoriskey, Frederick G.; Crossin, Glenn T; Cooke, Steven J.; Aarestrup, Kim; Rønning, Lars; Sjursen, Aslak Darre; Davidsen, Jan Grimsrud (Peer reviewed; Journal article, 2021)The sea trout (anadromous brown trout Salmo trutta) displays extensive among-individual variation in marine migration behaviour. We studied the migration behaviour of 286 sea trout (27-89 cm) tagged with acoustic transmitters ... -
Habitat use of sea trout (Salmo trutta) veterans in two Norwegian estuaries
Harbak, Signe Brekke (Master thesis, 2022)Elvemunningar er eit viktig habitat for sjøaure (Salmot trutta) til alle årstider, og kan brukast gjennom vinterhalvåret som ein alternativ strategi til den meir vanlege overvintringa i ferskvatn. I denne studien blei ... -
How pathogens affect the marine habitat use and migration of sea trout (Salmo trutta) in two Norwegian fjord systems
Lennox, Robert J.; Eldøy, Sindre Håvarstein; Vollset, Knut; Miller, Kristi M.; Li, Shaorong; Kaukinen, Karia H.; Isaksen, Trond Einar; Davidsen, Jan Grimsrud (Peer reviewed; Journal article, 2020)Wild fish are confronting changing pathogen dynamics arising from anthropogenic disturbance and climate change. Pathogens can influence animal behaviour and life histories, yet there are little such data from fish in the ... -
Impact of salinity on oxygen consumption, swim performance, and blood physiology of brown trout (Salmo trutta)
Coffey, Rachel (Master thesis, 2024)Selv om virkningen av saltholdighet på euryhalin fiskearter er godt dokumentert, er det fortsatt et betydelig kunnskapshull om effekten på brunørret (Salmo trutta), spesielt når det gjelder deres fysiologi og svømmeytelse. ... -
Individual habitat use of sea trout (Salmo trutta) in the estuary of river Stjørdalselva
Endresen, Joakim (Master thesis, 2023)Brakkvannsestuarier er viktige habitat for noen sjøørret (Salmo trutta) gjennom hele året. Menneskelige aktiviteter som påvirker estuarier, vil ha en negativ effekt på disse sjøørretene. Derfor vil en bedre økologisk ... -
Individual repeatability in marine migratory behaviour: A multi-population assessment of anadromous brown trout tracked through consecutive feeding migrations
Eldøy, Sindre Håvarstein; Bordeleau, Xavier; Crossin, Glenn T; Davidsen, Jan Grimsrud (Journal article; Peer reviewed, 2019)Despite that the study of individual repeatability is a common topic in behavioral ecology, virtually nothing is known about inter-annual variability in the marine migratory behavior of iteroparous salmonids that can ... -
The influence of physiology, life history and environmental conditions on the marine migration patterns of sea trout
Eldøy, Sindre Håvarstein (Doctoral theses at NTNU;2020:204, Doctoral thesis, 2020)The marine migration of sea trout (anadromous brown trout, Salmo trutta) is an evolutionary adaption to exploit richer feeding opportunities at sea compared to the freshwater habitat. Over the last decades, there has been ... -
Life-history strategies in salmonids: the role of physiology and its consequences
Birnie-Gauvin, Kim; Bordeleau, Xavier; Cooke, Steven J.; Davidsen, Jan Grimsrud; Eldøy, Sindre Håvarstein; Eliason, Erika; Moore, Andy; Aarestrup, Kim (Peer reviewed; Journal article, 2021)Salmonids are some of the most widely studied species of fish worldwide. They span freshwater rivers and lakes to fjords and oceans; they include short- and long-distance anadromous migrants, as well as partially migratory ... -
Marine depth use of sea trout Salmo trutta in fjord areas of Central Norway
Eldøy, Sindre Håvarstein; Davidsen, Jan Grimsrud; Thorstad, Eva Bonsak; Whoriskey, Frederick G.; Aarestrup, Kim; Næsje, Tor; Rønning, Lars; Sjursen, Aslak Darre; Rikardsen, Audun H.; Arnekleiv, Jo Vegar (Journal article; Peer reviewed, 2017)The vertical behaviour of 44 veteran sea trout Salmo trutta (275–580 mm) in different marine fjord habitats (estuary, pelagic, near shore with and without steep cliffs) was documented during May–February by acoustic ... -
Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago
Davidsen, Jan Grimsrud; Bordeleau, Xavier; Eldøy, Sindre Håvarstein; Whoriskey, Frederick G.; Power, Michael John; Crossin, Glenn T; Buhariwalla, Colin; Gaudin, Philippe (Journal article; Peer reviewed, 2021)In 1954, brown trout were introduced to the Kerguelen archipelago (49°S, 70°E), a pristine, sub-Antarctic environment previously devoid of native freshwater fishes. Trout began spreading rapidly via coastal waters to ... -
Marine migration and habitat use of anadromous brown trout Salmo trutta
Eldøy, Sindre Håvarstein; Davidsen, Jan Grimsrud; Thorstad, Eva Bonsak; Whoriskey, F.; Aarestrup, K.; Næsje, Tor; Rønning, Lars; Sjursen, Aslak Darre; Rikardsen, Audun H.; Arnekleiv, Jo Vegar (Journal article, 2015)The biology and ecology of anadromous brown trout (Salmo trutta) at sea is poorly understood. This study provided information on spatial and temporal distribution of sea trout in the ocean. The behaviour of 115 individuals ... -
Marine vandringer og områdebruk hos sjøørret og sjørøye i Tosenfjorden
Davidsen, Jan Grimsrud; Eldøy, Sindre Håvarstein; Sjursen, Aslak Darre; Rønning, Lars; Bordeleau, Xavier; Daverdin, Marc; Bårdsen, Marthe Tangvold; Whoriskey, Frederick G.; Koksvik, Jan Ivar (NTNU Vitenskapsmuseet naturhistorisk rapport;, Research report, 2018) -
Nutritional correlates of spatiotemporal variations in the marine habitat use of brown trout (Salmo trutta) veteran migrants
Bordeleau, Xavier; Davidsen, Jan Grimsrud; Eldøy, Sindre Håvarstein; Sjursen, Aslak Darre; Whoriskey, Frederick G.; Crossin, Glenn T (Journal article; Peer reviewed, 2018)The brown trout (Salmo trutta) is an iteroparous, anadromous salmonid that exhibits a complex continuum of feeding migration tactics, ranging from freshwater residency, to potamodromy, to estuarine migration, as well as ... -
Områdebruk til sjøørret ved Ørin, Verdalselva
Davidsen, Jan Grimsrud; Sjursen, Aslak Darre; Rønning, Lars; Daverdin, Marc; Davidsen, Anette Sophie Grimsrud; Eldøy, Sindre Håvarstein (NTNU Vitenskapsmuseet naturhistorisk rapport, Research report, 2023)