Blar i Brage IMR på forfatter "Nilsson, Jonatan"
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Acute stress response on Atlantic salmon: a time-course study of the effects on plasma metabolites, mucus cortisol levels, and head kidney transcriptome profile
Madaro, Angelico; Nilsson, Jonatan; Whatmore, Paul; Roh, HyeongJin; Grove, Søren; Stien, Lars Helge; Olsen, Rolf Erik (Peer reviewed; Journal article, 2022)Farmed Atlantic salmon (Salmo salar) welfare and performance can be strongly influenced by stress episodes caused by handling during farming practices. To better understand the changes occurring after an acute stress ... -
Andre samlerapport: velferd for triploid laks i Nord-Norge - Sluttrapport, utsett 2018
Stien, Lars Helge; Sambraus, Florian; Sæther, Per Anton; Lind, Mattias Bendiksen; Kristiansen, Tore S; Nilsson, Jonatan; Fjelldal, Per Gunnar (Rapport fra havforskningen;2021 - 13, Research report, 2021)Denne rapporten tar for seg velferden til 8 grupper av triploid laks satt ut i Nord-Norge vår, sommer og høst 2018. Vårutsettene fikk varierende velferd og dødelighet. Dette skyltes i stor grad at disse fiskegruppene hadde ... -
Assessment of long-term implementation of sea lice prevention technologies: efficiency in reducing infestations and impact on fish welfare
Bui, Samantha; Stien, Lars Helge; Nilsson, Jonatan; Oppedal, Frode (Rapport fra havforskningen;45-2018, Research report, 2018) -
Avlusing med kaldt vann? – effektivitet og laksens velferd — sluttrapport FHF prosjekt 901488
Oppedal, Frode; Stien, Lars Helge; Wright, Daniel William; Moltumyr, Lene; Nilsson, Jonatan; Dempster, Timothy David; Overton, Kathy (Rapport fra havforskningen, Research report, 2019)Termisk behandling av oppdrettslaks med varmt vann blir hyppig brukt av næringen som avlusingsmetode. Behandlingen rapporteres å fjerne mobile lus effektivt, men kan også føre til dårligere fiskevelferd og økt dødelighet. ... -
Consistent melanophore spot patterns allow long-term individual recognition of Atlantic salmon Salmo salar
Stien, Lars Helge; Nilsson, Jonatan; Bui, Samantha; Fosseidengen, Jan Erik; Kristiansen, Tore S; Øverli, Øyvind; Folkedal, Ole (Peer reviewed; Journal article, 2017) -
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)?
Moltumyr, Lene; Gismervik, Kristine; Gu, Jinni; Gåsnes, Siri Kristine; Kristiansen, Tore S; Rønnestad, Ivar; Nilsson, Jonatan; Stien, Lars Helge (Peer reviewed; Journal article, 2020)Warm water treatment, i.e. exposure to sea water at a temperature of 28–34 °C for 20–30 s, has in recent years been widely used for delousing of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) in ... -
Effect of water temperature and exposure duration on detachment rate of salmon lice (Lepeophtheirus salmonis); testing the relevant thermal spectrum used for delousing
Nilsson, Jonatan; Barrett, Luke T.; Mangor-Jensen, Anders; Nola, Velimir; Harboe, Torstein; Folkedal, Ole (Peer reviewed; Journal article, 2023)Thermal delousing has become the most applied method for treatment against salmon lice. However, the temperature range used is strongly aversive for salmonids, and the method is associated with increased mortality. Treatment ... -
Effects of Pumping Height and Repeated Pumping in Atlantic Salmon Salmo salar
Espmark, Åsa Maria Olofsdotter; Midling, Kjell Øyvind; Nilsson, Jonatan; Humborstad, Odd Børre (Journal article; Peer reviewed, 2016-06-17)The aim of this study was to evaluate the effects of pumping height and repeated pumping on the generalized stress response and gross injuries in harvest sized Atlantic salmon. Fish pumped from a net pen at either high ... -
Effekt på dyrevelferd av gjentatte termiske behandlinger med ulik Δt, ulik utgangstemperatur og ulik behandlingstemperatur
Stien, Lars Helge; Bui, Samantha; Nilsson, Jonatan; Madaro, Angelico; Fjelldal, Per Gunnar; Schrøder, Merete Bjørgan; Venås, Birger; Johansen, Malin; Seternes, Tore; Åkesson, Caroline Piercey; Wisløff, Helene; Brinchmann, Monica Fengsrud; Patel, Deepti Manjari; Iversen, Martin Haugmo (Rapport fra havforskningen;2022 - 39, Research report, 2022)Formålet med forsøkene i arbeidspakke 2 i TermVel-prosjektet var å avdekke effekt på dyrevelferd av gjentatt termisk behandling av laks gitt ulik utgangstemperatur, ulik behandlingstemperatur og ulik Δt (differanse mellom ... -
Efficiency and welfare impact of long-term simultaneous in situ management strategies for salmon louse reduction in commercial sea cages
Bui, Samantha; Nilsson, Jonatan; Stien, Lars Helge; Trengereid, Henrik; Oppedal, Frode (Peer reviewed; Journal article, 2020)The Atlantic salmon (Salmo salar) aquaculture industry is faced with an obstacle in sustainability with increasing production, which is the control and prevention of the ectoparasitic salmon louse Lepeophtheirus salmonis. ... -
Exploration and learning of demand-feeding in Atlantic cod (Gadus morhua)
Nilsson, Jonatan; Torgersen, Thomas (Journal article; Peer reviewed, 2010-08-15)A bite–and–pull demand–feeding system was introduced to groups of cultured cod (Gadus morhua). For half of the groups trigger actuations were rewarded with food, while actuations were unrewarded in the other groups. ... -
Exploration and learning of demand-feeding in Atlantic cod (Gadus morhua)
Nilsson, Jonatan; Torgersen, Thomas (Journal article; Peer reviewed, 2010-08-15)A bite–and–pull demand–feeding system was introduced to groups of cultured cod (Gadus morhua). For half of the groups trigger actuations were rewarded with food, while actuations were unrewarded in the other groups. ... -
Full compensatory growth before harvest and no impact on fish welfare in Atlantic salmon after an 8-week fasting period
Hvas, Malthe; Nilsson, Jonatan; Vågseth, Tone; Nola, Velimir; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Oppedal, Frode; Stien, Lars Helge; Folkedal, Ole (Peer reviewed; Journal article, 2021)Individually tagged Atlantic salmon postsmolts (≈1200 g, 46 cm) reared in triplicate indoor holding tanks were fasted for 8 weeks at 12 °C and subsequently refed for 5 weeks, whereafter they were transferred to triplicate ... -
Increasing Dip Net Mesh Size Results in More Fin Splits in Post-Smolt Atlantic Salmon (Salmo salar)
Moltumyr, Lene; Stien, Lars Helge; Madaro, Angelico; Nilsson, Jonatan (Peer reviewed; Journal article, 2022)Dip nets are widely used to retrieve fish from the water but can cause injuries to the fish. The objective of this study was to document the potential effects of dip net mesh size with respect to external injuries, more ... -
Laksvel - Standardisert operasjonell velferdsovervåking for laks i matfiskanlegg
Nilsson, Jonatan; Gismervik, Kristine; Nielsen, Kristoffer Vale; Iversen, Martin Haugmo; Noble, Christopher; Kolarevic, Jelena; Frotjold, Hilde; Nilsen, Kathrine; Wilkinson, Eirik; Klakegg, Barbo; Hauge, Hege Sørvåg; Sæther, Per Anton; Kristiansen, Tore S; Stien, Lars Helge (Rapport fra havforskningen;2022 - 14, Research report, 2022-05-30)Selv om oppdrettere og fiskehelsepersonell har undersøkt og dokumentert velferden til laksen har det ikke funnes noen standardisert måte å gjøre dette på. Denne protokollen er laget for å kunne brukes som en felles ... -
Learning and anticipatory behaviour in a “sit-and-wait” predator: the Atlantic halibut
Nilsson, Jonatan; Kristiansen, Tore S.; Fosseidengen, Jan Erik; Stien, Lars Helge; Fernö, Anders; van den Bos, Ruud (Journal article; Peer reviewed, 2010-03)We studied the learning capacities and anticipatory behaviour in a “sit-and-wait” predatory fish, the Atlantic halibut, Hippoglossus hippoglossus. In Experiment 1 two groups of halibut received series of light flashes ... -
Learning and anticipatory behaviour in a “sit-and-wait” predator: the Atlantic halibut
Nilsson, Jonatan; Kristiansen, Tore S.; Fosseidengen, Jan Erik; Stien, Lars Helge; Fernö, Anders; van den Bos, Ruud (Journal article; Peer reviewed, 2010-03)We studied the learning capacities and anticipatory behaviour in a “sit-and-wait” predatory fish, the Atlantic halibut, Hippoglossus hippoglossus. In Experiment 1 two groups of halibut received series of light flashes ... -
Long-term welfare effects of repeated warm water treatments on Atlantic salmon (Salmo salar)
Moltumyr, Lene; Nilsson, Jonatan; Madaro, Angelico; Seternes, Tore; Winger, Fredrik Agerup; Rønnestad, Ivar; Stien, Lars Helge (Peer reviewed; Journal article, 2021)Warm water treatment has in recent years become widely used for ridding salmonids of sea lice in aquaculture although the consequences of the treatment for fish welfare are not adequately investigated. The objective of ... -
Lusepåslag og velferd hos dypfôret og overflatefôret laks på lokalitet Skrubbholmen midtvinters. – Delrapport fra FHF-prosjekt 901154 «Dypelysogfôring»
Nilsson, Jonatan; Stien, Lars Helge; Oppedal, Frode (Rapport fra havforskningen;35-2018, Research report, 2018) -
Opprettsfisk tilpasser seg
Torgersen, Thomas; Remen, Mette; Oppedal, Frode; Folkedal, Ole; Aasjord, Anne; Nilsson, Jonatan; Stien, Lars Helge; Kristiansen, Tore S. (Havforskningsnytt;Nr. 3 - 2011, Working paper, 2011)Hvor godt og hvor fort oppdrettsfisk kan venne seg til miljøforandringene de utsettes for avgjør i stor grad hvor god velferd de har, uavhengig av om miljøendringene skyldes driftsrutiner eller naturlig variasjon.