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Malthe Hvas

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Researcher
Telephone: 48889321
Department: Dyrevelferd

Publications

Academic articles

2024

Atlantic salmon in chronic turbulence: Effects on growth, behaviour, welfare, and stress

Emma Barbier, Frode Oppedal, Malthe Hvas
Aquaculture 582
2024

Louse-induced mortality thresholds in Atlantic salmon of wild-origin

Samantha Bui, Per Gunnar Fjelldal, Malthe Hvas, Ørjan Karlsen, Sussie Trine Dalvin
Conservation Science and Practice (CSP)
2023

Novel tag-based method for measuring tailbeat frequency and variations in amplitude in fish

F. Warren-Myers, Eirik Svendsen, Martin Føre, Ole Folkedal, Frode Oppedal, Malthe Hvas
Animal Biotelemetry 11
2023

Welfare effects of environmental hypercapnia quantified by indicators based on morphology and allostatic load in Atlantic salmon (Salmo salar)

Erik Höglund, Ole Folkedal, Johan Aerts, Malthe Hvas, Øyvind Øverli, Anders Mangor-Jensen, Marco A. Vindas, Jonatan Nilsson, Tore Kristiansen
Aquaculture 572
2022

Energetic costs of ectoparasite infection in Atlantic salmon

Malthe Hvas, Samantha Bui
Journal of Experimental Biology 225
2022

Swimming energetics of Atlantic salmon in relation to extended fasting at different temperatures

Hvas, Malthe
Conservation Physiology 10 p. 1-14
2021

Full compensatory growth before harvest and no impact on fish welfare in Atlantic salmon after an 8-week fasting period

Malthe Hvas, Jonatan Nilsson, Tone Vågseth, Velimir Nola, Per Gunnar Fjelldal, Tom Johnny Hansen, Frode Oppedal, Lars Helge Stien, Ole Folkedal
Aquaculture 546
2021

Influence of photoperiod and protocol length on metabolic rate traits in ballan wrasse Labrus bergylta

Hvas, Malthe
Journal of Fish Biology p. 1-10
2021

What is The Limit of Sustained Swimming in Atlantic Salmon Post smolts?

Malthe Hvas, Ole Folkedal, Frode Oppedal
Aquaculture Environment Interactions 13 p. 189-198
2021

Sentinels in Salmon Aquaculture: Heart Rates Across Seasons and During Crowding Events

Fletcher Warren-Myers, Malthe Hvas, Tone Vågseth, Tim Dempster, Frode Oppedal
Frontiers in Physiology
2021

The effect of fasting period on swimming performance, blood parameters and stress recovery in Atlantic salmon post molts

Malthe Hvas, Jonatan Nilsson, Tone Vågseth, Velimir Nola, Per Gunnar Fjelldal, Tom Johnny Hansen, Frode Oppedal, Lars Helge Stien, Ole Folkedal
Aquaculture 546
2021

The effect of fasting period on swimming performance, blood parameters and stress recovery in Atlantic salmon post smolts

Malthe Hvas, Lars Helge Stien, Frode Oppedal
Comparative Biochemistry and Physiology A 255
2020

Skeletal deformities in wild and farmed cleaner fish species used in Atlantic salmon Salmo salar aquaculture

Per Gunnar Fjelldal, Angelico Madaro, Malthe Hvas, Lars Helge Stien, Frode Oppedal, Thomas Fraser
Journal of Fish Biology p. 1-10
2020

Is it advantageous for Atlantic salmon to be triploid at lower temperatures?

Erling Nilsen Riseth, Thomas Fraser, Florian Sambraus, Lars Helge Stien, Malthe Hvas
Journal of Thermal Biology 89
2020

Heart rates of Atlantic salmon Salmo salar during a critical swim speed test and subsequent recovery

Malthe Hvas, Ole Folkedal, Frode Oppedal
Journal of Fish Biology
2020

Fish welfare in offshore salmon aquaculture

Malthe Hvas, Ole Folkedal, Frode Oppedal
Reviews in Aquaculture
2020

Heart rate bio-loggers as welfare indicators in Atlantic salmon (Salmo salar) aquaculture

Malthe Hvas, Ole Folkedal, Frode Oppedal
Aquaculture 529
2020

The metabolic rate response to feed withdrawal in Atlantic salmon post-smolts

Malthe Hvas, Lars Helge Stien, Frode Oppedal
Aquaculture 529
2019

Fish Welfare Based Classification Method of Ocean Current Speeds at Aquaculture Sites

Kristbjörg Edda Jónsdóttir, Malthe Hvas, Jo Arve Alfredsen, Martin Føre, Morten Alver, Hans Vanhauwaert Bjelland, Frode Oppedal
Aquaculture Environment Interactions 11 p. 249-261
2019

Physiological responses of farmed Atlantic salmon and two cohabitant species of cleaner fish to progressive hypoxia

Malthe Hvas, Frode Oppedal
Aquaculture 512
2019

Influence of experimental set-up and methodology for measurements of metabolic rates and critical swimming speed in Atlantic salmon Salmo salar

Malthe Hvas, Frode Oppedal
Journal of Fish Biology 95 p. 893-902
2019

Physiological performance of ballan wrasse (Labrus bergylta) at different temperatures and its implication for cleaner fish usage in salmon aquaculture

Jeffrey William Yuen, Tim Dempster, Frode Oppedal, Malthe Hvas
Biological control (Print) 135 p. 117-123
2019

Fish welfare based classification method of ocean current speeds at aquaculture sites

Kristbjörg Edda Jónsdóttir, Malthe Hvas, Jo Arve Alfredsen, Martin Føre, Morten Alver, Hans Vanhauwaert Bjelland, Frode Oppedal
Aquaculture Environment Interactions 11 p. 249-261
2019

Metabolic and functional impacts of hypoxia vary with size in Atlantic salmon

Tina Marie Wier Oldham, Barbara F. Nowak, Malthe Hvas, Frode Oppedal
Comparative Biochemistry and Physiology A 231 p. 30-38
2018

Oxygen Uptake and Osmotic Balance of Atlantic Salmon in Relation to Exercise and Salinity Acclimation

Malthe Hvas, Tom Ole Nilsen, Frode Oppedal
Frontiers in Marine Science 5 p. 1-11
2018

Metabolic rates, swimming capabilities, thermal niche and stress response of the lumpfish, cyclopterus lumpus

Malthe Hvas, Ole Folkedal, Albert Imsland, Frode Oppedal
Biology Open 7:bio036079 p. 1-9
2017

The gill parasite Paramoeba perurans compromises aerobic scope, swimming capacity and ion balance in Atlantic salmon.

Malthe Hvas, Egil Karlsbakk, Stig Mæhle, Daniel William Wright, Frode Oppedal
Conservation Physiology 5 p. 1-12
2017

Sustained swimming capacity of Atlantic salmon

Malthe Hvas, Frode Oppedal
Aquaculture Environment Interactions 9 p. 361-369
2017

The effect of thermal acclimation on aerobic scope and critical swimming speed in Atlantic salmon Salmo salar

Malthe Hvas, Ole Folkedal, Albert Imsland, Frode Oppedal
Journal of Experimental Biology 220 p. 2757-2764
2017

Assessing swimming capacity and schooling behaviour in farmed Atlantic salmon Salmo salar with experimental push-cages

Malthe Hvas, Ole Folkedal, David Solstorm, Tone Vågseth, Jan Olav Fosse, Lars Christian Gansel, Frode Oppedal
Aquaculture 473 p. 423-429
2016

Critical swimming speed in groups of Atlantic salmon Salmo salar

Mette Remen, Frida Solstorm, Samantha Bui, Klebert Pascal, Tone Vågseth, David Solstorm, Malthe Hvas, Frode Oppedal
Aquaculture Environment Interactions 8 p. 659-664

Other journal contributions

2022

Forvirring om fisk som forsøksdyr

Ole Folkedal, Hans Vanhauwaert Bjelland, Malthe Hvas
Forskersonen.no
2022

Skremmende tall om dyreforsøk er storm i vannglass

Ole Folkedal, Malthe Hvas
www.hi.no
2022

Våre dyreforsøk skal fremme fiskevelferd

Ole Folkedal, Hans Vanhauwaert Bjelland, Malthe Hvas
Forskersonen.no
2022

Forsøksfisk for bedre dyrevelferd

Ole Folkedal, Malthe Hvas, Hans Vanhauwaert Bjelland
www.aftenbladet.no
2022

Forsøksfisk for bedre dyrevelferd

Ole Folkedal, Malthe Hvas, Hans Vanhauwaert Bjelland
an.no
2022

Skremmende tall om dyreforsøk er storm i vannglass

Hans Vanhauwaert Bjelland, Ole Folkedal, Malthe Hvas
www.adressa.no

Scientific lectures

2024

Eksponert oppdrett - Kunnskap og løsninger for å trekke lengre ut, uten å dra til havs

Jan Tore Fagertun, Hans Vanhauwaert Bjelland, Trine Thorvaldsen, Martin Gutsch, Eivind Lona, Biao Su, Per Christian Endresen, Malthe Hvas, Eirik Svendsen
2023

Biological premises for salmon offshore farming

Frode Oppedal, Malthe Hvas, Ole Folkedal
2023

The adaptability of Atlantic salmon Salmon salar to novel turbulent environments

Emma Barbier, Malthe Hvas, Frode Oppedal
2023

Fiskens mestringsevne for eksponerte forhold

Ole Folkedal, Malthe Hvas, Frode Oppedal
2023

Utfordringer for oppdrettsnæringen i et klima i endring

Anne Dagrun Sandvik, Bjørn Ådlandsvik, Malthe Hvas
2022

Hva nå? Eksponert oppdrett fra et biologisk standpunkt

Frode Oppedal, Ole Folkedal, Malthe Hvas
2022

Mortality thresholds for salmon lice infections in Atlantic salmon

Sussie Dalvin, Per Gunnar Fjelldal, Malthe Hvas, Ørjan Karlsen, Samantha Bui
2022

Fasting and fish welfare in salmon aquaculture

Hvas, Malthe
2022

Salmon lice in wild and cultured salmonids

Sussie Dalvin, Malthe Hvas, Per Gunnar Fjelldal, Ørjan Karlsen, Samantha Bui
2022

Sulting av laks - ikke nødvendigvis en plage

Hvas, Malthe
2022

Fasting and fish welfare in salmon aquaculture

Hvas, Malthe
2022

Fish welfare in new aquaculture contexts – challenges for and contributions from marine technology

Frode Oppedal, Malthe Hvas, Ole Folkedal
2021

Laksens tålegrenser for havbruk til havs

Frode Oppedal, Malthe Hvas, Ole Folkedal
2021

Hvor mye vannstrøm tåler laks og rensefisk

Frode Oppedal, Ole Folkedal, Malthe Hvas
2021

Fish welfare implications of prolonged fasting periods in Atlantic salmon

Malthe Hvas, Ole Folkedal, Frode Oppedal, Lars Helge Stien
2021

Fish welfare in exposed farming

Ole Folkedal, Malthe Hvas, Frode Oppedal
2021

Sulting av laks – en positiv historie

Lars Helge Stien, Malthe Hvas, Frode Oppedal
2021

Vekst er mer enn kilo og gram

Ole Folkedal, Lars Helge Stien, Frode Oppedal, Malthe Hvas, Jonatan Nilsson
2021

Optimizing feed withdrawal for safeguarding fish welfare

Hvas, Malthe
2019

Kan fiskevelferd sikres langt til havs?

Malthe Hvas, Ole Folkedal, Frode Oppedal
2018

Rognkjeks er ikke laks

Hvas, Malthe
2018

The use of swim tunnel studies in defining environmental thresholds for Atlantic salmon and cleanerfish in exposed Aquaculture

Malthe Hvas, Ole Folkedal, Frode Oppedal
2017

Hvilke velferdsindikatorer skal brukes i ulike anleggskonsepter for lakseoppdrett?

Kristoffer Vale Nielsen, Chris Noble, Kristine Gismervik, Cecilie Marie Mejdell, Jonatan Nilsson, Jelena Kolarevic, Lars Helge Stien, Martin Haugmo Iversen, James F. Turnbull, Bjørn-Steinar Sæther, Åsa Maria Olofsdotter Espmark, Kjell Øyvind Midling, David Izquierdo-Gomez, Tore S Kristiansen, Thomas Torgersen, Frode Oppedal, Ole Folkedal, Malthe Hvas, Daniel William Wright, Kristian Ellingsen
2017

The effect of environmental factors on swimming capacity and oxygen uptake in Atlantic salmon

Hvas, Malthe
2017

Thresholds for hypoxia and water current in salmon production

Frode Oppedal, Malthe Hvas, Frida Solstorm, David Solstorm, Tina Oldham, Ole Folkedal, Lars Helge Stien
2017

The gill parasite Paramoeba perurans compromises aerobic scope and swimming capacity in Atlantic salmon Salmo salar

Frode Oppedal, Malthe Hvas, Egil Karlsbakk
2017

Velferdsindikatorer for laks og regnbueørret (FISHWELL)

Jonatan Nilsson, Lars Helge Stien, Tore S Kristiansen, Ole Folkedal, Frode Oppedal, Thomas Torgersen, Malthe Hvas, Daniel W Wrigth, Chris Noble, Jelena Kolarevic, Kristine Gismervik, James F. Turnbull
2016

Premisser for merdteknologi – lytter vi til "brukerens" krav til vannstrøm for god vekst og velferd på eksponerte lokaliteter?

Ole Folkedal, Malthe Hvas, David Solstorm, Frida Solstorm, Mette Remen, Frode Oppedal
2016

Hva er akseptabel vannstrøm for laks i merder?

Frode Oppedal, David Solstorm, Frida Solstorm, Mette Remen, Malthe Hvas, Ole Folkedal

Poster

2022

Mortality thresholds for Atlantic salmon with salmon lice infections

Samantha Bui, Per Gunnar Fjelldal, Malthe Hvas, Ørjan Karlsen, Sussie Dalvin
2017

The gill parasite Paramoeba perurans compromises aerobic scope, swimming capacity and ion balance in Atlantic salmon.

Malthe Hvas, Egil Karlsbakk, Frode Oppedal

Reports and dissertations

2023

Tolerance limits to fluctuating water currents in Atlantic salmon (Salmo salar): A novel method to simulate the impact of ocean waves on salmon welfare in the laboratory “Wave after Wave”

Ronja Rogerdatter Athammer, Malthe Hvas, Frode Oppedal
2023

Chronic turbulence and Atlantic salmon (Salmo salar): assessing effects on growth performance, behaviour, welfare, stress and swimming capacity.

Barbier Emma, Malthe Hvas, Frode Oppedal
2019

Havbasert oppdrett – hvor mye vannstrøm tåler laks og rensefisk? - fiskevelferd og grenseverdier

Malthe Hvas, Ole Folkedal, Frode Oppedal
2019

Physiology and welfare of Atlantic salmon and cleaner fish in exposed aquaculture

Malthe Hvas, Frode Oppedal, Ole Folkedal, Albert Imsland
2018

Do diploid Atlantic salmon (Salmo salar) have a higher swimming capacity than triploid?

Erling Nilsen, Enrique Blanco Gonzalez, Lars Helge Stien, Malthe Hvas
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