Tom Hansen

Researcher

E-mail: tomh@hi.no

Telephone: 91380550

Department: Reproduksjon og utviklingsbiologi

Publications

Academic articles

2024

Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon

Nina Strand, Kevin Alan Glover, Sonnich Meier, Fernando Ayllon, Vidar Wennevik, Abdullah Sami Madhun, Øystein Skaala, Kristin Hamre, Per Gunnar Fjelldal, Tom Johnny Hansen, Eero Niemelä, Sofie Knutar, Per Tommy Andersen-Fjeldheim, Monica Favnebøe Solberg

ICES Journal of Marine Science 81 p. 119-129

2024

Spawning manipulation, broodfish diet feeding and egg production in farmed Atlantic salmon

Per Gunnar Fjelldal, Anne-Catrin Adam, Gerd Marit Berge, Ingrid Lein, Ernst Morten Hevrøy, Ingun Næve, Rudi R. Seim, Maren Mommens, Kaja Helvik Skjærven, Tom Johnny Hansen, Kristin Hamre

Aquaculture 580

2023

Experimental transmission of piscine orthoreovirus-1 (PRV-1) in different life stages of Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)

Dhamotharan Kannimuthu, HyeongJin Roh, Hugh Craig Morton, Ma Michelle Demogina Penaranda, Anne Vossgård, Tom Johnny Hansen, Per Gunnar Fjelldal, Egil Erlingsson Karlsbakk, Ingrid Uglenes Fiksdal, Maria Dahle, Hakon Schau Berg-Rolness, Stig Mæhle, Dawit Berhe Ghebretnsae, Joachim Nordbø, Sonal Patel, Abdullah Sami Madhun, Søren Grove, Bjørn Olav Kvamme

Frontiers in Marine Science 10

2023

Growth Performance, Nutrient Digestibility, and Retention in Atlantic Salmon, Salmo salar L., Fed Diets with Fermented Sugar Kelp, Saccharina latissima

Sahar Sartipiyarahmadi, Antony Jesu Prabhu Philip, Harald Sveier, Silje Steinsund, Erik Jan Robert Lock, Angelico Madaro, Tom Johnny Hansen, Martin Wiech, Øivind Strand, Jan Vidar Jakobsen, Marleen E. Van Der Heide, Jan Værum Nørgaard, Sofie C. Remø

Aquaculture Nutrition 2023

2023

Statistical modelling of voluntary feed intake in individual Atlantic salmon (Salmo salar L.)

Ana S. Gomes, Fabian Zimmermann, Ernst Morten Hevrøy, Marcus Aadne Lowther Søyland, Tom Johnny Hansen, Tom Ole Nilsen, Ivar Rønnestad

Frontiers in Marine Science 10

2023

Statistical modelling of voluntary feed intake in individual Atlantic salmon (Salmo salar L.)

Ana S. Gomes, Fabian Zimmermann, Ernst Morten Hevrøy, Marcus Søyland, Tom Johnny Hansen, Tom Ole Nilsen, Ivar Rønnestad

Frontiers in Marine Science 10

2023

The Distribution of IgT mRNA+ Cells in the Gut of the Atlantic Salmon (Salmo salar L.)

Pedro Luis Castro, Fran Barac, Tom Johnny Hansen, Per Gunnar Fjelldal, Ivar Hordvik, Håvard Bjørgen, Erling Olaf Koppang

Animals 13

2023

Statistical modelling of voluntary feed intake in individual Atlantic salmon (Salmo salar L.)

Ana Cristina Da Silva Gomes, Fabian Zimmermann, Ernst Morten Hevrøy, Marcus Søyland, Tom Johnny Hansen, Tom Ole Nilsen, Ivar Rønnestad

Frontiers in Marine Science 10

2023

Effects of temperature and feeding regime on cortisol concentrations in scales of Atlantic salmon post-smolts

Christina O'Toole, Philip White, Katie Thomas, Niall O'Maoiléidigh, Per Gunnar Fjelldal, Tom Johnny Hansen, Conor T. Graham, Deirdre Brophy

Journal of Experimental Marine Biology and Ecology 569

2023

Anatomical and pathological characteristics of ribs in the Atlantic salmon (Salmo salar L.) and its relevance to soft tissue changes

Malin Helen Brimsholm, Per Gunnar Fjelldal, Tom Johnny Hansen, Cathrine Trangerud, Geir Magne Knutsen, Charlotte Finstad Asserson, Erling Olaf Koppang, Håvard Bjørgen

Anatomia, Histologia, Embryologia. Journal of Veterinary Medicine Series C

2023

Long term effects of smolt production strategy and early seawater phase rearing environment on mortality, growth, sexual maturation, and vertebra deformities in farmed Atlantic salmon (Salmo salar L.)

Lars Eirik Myklatun, Thomas Fraser, Per Gunnar Fjelldal, Audun Østby Pedersen, Tom Johnny Hansen

Aquaculture 569

2023

Red and melanized focal changes in white skeletal muscle in Atlantic salmon (Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions

Malin Helen Brimsholm, Per Gunnar Fjelldal, Tom Johnny Hansen, Thomas Fraser, Monica Favnebøe Solberg, Kevin Alan Glover, Erling Olaf Koppang, Håvard Bjørgen

Journal of Fish Diseases

2023

Seasonal Changes in Photoperiod: Effects on Growth and Redox Signaling Patterns in Atlantic Salmon Postsmolts

Peng Yin, Takaya Saito, Per Gunnar Fjelldal, Björn Thrandur Björnsson, Sofie C. Remø, Tom Johnny Hansen, Sandeep Sharma, Rolf-Erik Olsen, Kristin Hamre

Antioxidants 12

2023

Experimental transmission of piscine orthoreovirus-1 (PRV-1) in different life stages of Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)

Dhamotharan Kannimuthu, HyeongJin Roh, Hugh Craig Morton, Ma Michelle Demogina Penaranda, Anne Vossgård, Tom Johnny Hansen, Per Gunnar Fjelldal, Egil Erlingsson Karlsbakk, Ingrid Uglenes Fiksdal, Maria Dahle, Håkon Berg-Rolness, Stig Mæhle, Dawit Berhe Ghebretnsae, Joachim Nordbø, Sonal Patel, Abdullah Sami Madhun, Søren Grove, Bjørn Olav Kvamme

Frontiers in Marine Science 10

2023

Environmental and Genetic (vgll3) Effects on the Prevalence of Male Maturation Phenotypes in Domesticated Atlantic Salmon

Thomas Fraser, Tom Johnny Hansen, Per Gunnar Fjelldal

Fishes 8

2023

Adaptive photoperiod interpretation modulates phenological timing in Atlantic salmon

Tina Marie Wier Oldham, Frode Oppedal, Per Gunnar Fjelldal, Tom Johnny Hansen

Scientific Reports 13

2023

Atlantic salmon male post-smolt maturation can be reduced by using a 3-hour scotophase when inducing smoltification

Thomas Fraser, Tom Johnny Hansen, Birgitta Norberg, Tom Ole Nilsen, Rüdiger W. Schulz, Per Gunnar Fjelldal

Aquaculture 562

2023

In sea trout, the physiological response to salmon louse is stronger in female than in males

Per Gunnar Fjelldal, Sussie Trine Dalvin, Mathias Stølen Ugelvik, Audun Østby Pedersen, Tom Johnny Hansen, Bjørnar Skjold, Lise Dyrhovden, Ann-Kathrin Jakobsen Kroken, Ørjan Karlsen

Conservation Physiology 11

2022

Triploid Atlantic salmon × brown trout hybrids have similar seawater growth and welfare issues as triploid Atlantic salmon, but both were heavier at harvest than their diploid counterparts

Thomas Fraser, Tom Johnny Hansen, Sofie C. Remø, Rolf Erik Olsen, Per Gunnar Fjelldal

Aquaculture 552

2022

Pituitary Gonadotropin Gene Expression During Induced Onset of Postsmolt Maturation in Male Atlantic Salmon: In Vivo and Tissue Culture Studies

Diego Crespo, Kai Ove Skaftnesmo, Erik Nordtorp Kjærner-Semb, Ozlem Yilmaz, Birgitta Norberg, Sara Olausson, Petra Vogelsang, Jan Bogerd, Lene Kleppe, Rolf Brudvik Edvardsen, Eva Andersson, Anna Wargelius, Tom Johnny Hansen, Per Gunnar Fjelldal, Rüdiger W. Schulz

Frontiers in Endocrinology 13

2022

Impact of atioxidant feed and growth manipulation on the redox regulation of Atlantic salmon smolts

Peng Yin, Bjørn Thrandur Bjørnsson, Per Gunnar Fjelldal, Takaya Saito, Sofie C. Remø, Rolf Brudvik Edvardsen, Tom Johnny Hansen, Sandeep Sharma, Rolf Erik Olsen, Kristin Hamre

Antioxidants 11 p. 1-18

2022

Full production cycle performance of gene-edited, sterile Atlantic salmon - growth, smoltification, welfare indicators and fillet composition

Lene Kleppe, Per Gunnar Fjelldal, Eva Andersson, Tom Johnny Hansen, Monica Sanden, Aina Bruvik, Kai Ove Skaftnesmo, Tomasz Furmanek, Erik Nordtorp Kjærner-Semb, Diego Crespo, Simon Flavell, Audun Østby Pedersen, Petra Vogelsang, Anja Torsvik, Karen Anita Kvestad, Sara Olausson, Birgitta Norberg, Rüdiger W. Schulz, J. Bogerd, N. Santi, Rolf Brudvik Edvardsen, Anna Wargelius

Aquaculture 560

2022

Effects of laboratory salmon louse infection on mortality, growth, and sexual maturation in Atlantic salmon

Per Gunnar Fjelldal, Thomas Fraser, Tom Johnny Hansen, Ørjan Karlsen, Samantha Bui

ICES Journal of Marine Science 79 p. 1530-1538

2022

The Piwil1 N domain is required for germ cell survival in Atlantic salmon

Fernanda Loureiro Almeida, Kai Ove Skaftnesmo, Eva Andersson, Lene Kleppe, Rolf Brudvik Edvardsen, Birgitta Norberg, Per Gunnar Fjelldal, Tom Johnny Hansen, Rüdiger W. Schulz, Anna Wargelius

Frontiers in Cell and Developmental Biology 10

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

Wild Atlantic salmon enter aquaculture sea-cages: A case study

Per Gunnar Fjelldal, Samantha Bui, Tom Johnny Hansen, Frode Oppedal, Gunnar O Bakke, Lea Marie Hellenbrecht, Sofie Knutar, Abdullah Sami Madhun

Conservation Science and Practice (CSP) 3 p. 1-7

2021

A comparison of triploid and diploid Atlantic salmon (Salmo salar) performance and welfare under commercial farming conditions in Norway

Angelico Madaro, Sissel Kjøglum, Tom Johnny Hansen, Per Gunnar Fjelldal, Lars Helge Stien

Journal of Applied Aquaculture

2021

Triploidy effects growth, life history strategies, and bone health in Arctic char (Salvelinus alpinus), but does not impact cataract incidence

Thomas Fraser, Tom Johnny Hansen, Sofie C. Remø, Per Gunnar Fjelldal

Aquaculture 547

2021

Triploidy leads to a mismatch of smoltification biomarkers in the gill and differences in the optimal salinity for post-smolt growth in Atlantic salmon

Raneesha de Fonseka, Per Gunnar Fjelldal, Florian Sambraus, Tom Ole Nilsen, Sofie C. Remø, Lars Helge Stien, Helena Reinardy, Angelico Madaro, Tom Johnny Hansen, Thomas Fraser

Aquaculture 546

2021

Wild Atlantic salmon enter aquaculture sea-cages: A case study

Per Gunnar Fjelldal, Samantha Bui, Tom Johnny Hansen, Frode Oppedal, Gunnar O Bakke, Lea Hellenbrecht, Sofie Knutar, Abdullah Sami Madhun

Conservation Science and Practice (CSP) 3 p. 1-7

2021

The genome sequence of the brown trout, Salmo trutta Linnaeus 1758

Tom Johnny Hansen, Per Gunnar Fjelldal, Sigbjørn Lien, Michelle Smith, Craig Corton, Karen Oliver, Jason Skelton, Emma Betteridge, Jale Doulcan, Oliver Fedrigo, Jaquelyn Mountcastle, Erich Jarvis, Shane A. McCarthy, William Chow, Kerstin Howe, James Torrance, Jonathan Wood, Ying Sims, Leanne Haggerty, Richard Challis, Jonathan Threlfall, Daniel Mead, Richard Durbin, Mark Blaxter

Wellcome Open Research 6

2021

Triploid Atlantic salmon and triploid Atlantic salmon × brown trout hybrids have better freshwater and early seawater growth than diploid counterparts

Thomas Fraser, Hilde Lerøy, Tom Johnny Hansen, Jon Egil Skjæraasen, Valentina Tronci, Cindy Pinto Pedrosa, Per Gunnar Fjelldal, Tom Ole Nilsen

Aquaculture 540

2021

Loss of stra8 Increases Germ Cell Apoptosis but Is Still Compatible With Sperm Production in Atlantic Salmon (Salmo salar)

Kai Ove Skaftnesmo, Diego Crespo, Lene Kleppe, Eva Andersson, Rolf Brudvik Edvardsen, Birgitta Norberg, Per Gunnar Fjelldal, Tom Johnny Hansen, Rüdiger W. Schulz, Anna Wargelius

Frontiers in Cell and Developmental Biology 9

2021

A multiplier peroxiporin signal transduction pathway powers piscine spermatozoa

Francois Chauvigné, Carla Ducat, Alba Ferré, Tom Johnny Hansen, Montserrat Carrascal, Joaquín Abián, Roderick Nigel Finn, Joan Cerdà

Proceedings of the National Academy of Sciences of the United States of America 118 p. 1-12

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

2020

Triploid Atlantic salmon Salmo salar have a higher dietary phosphorus requirement for bone mineralization during early development

Florian Sambraus, Tom Johnny Hansen, Britt Sværen Daae, Anders Thorsen, Roar Sandvik, Lars Helge Stien, Thomas Fraser, Per Gunnar Fjelldal

Journal of Fish Biology 97 p. 137-147

2020

Development of supermale and all-male Atlantic salmon to research the vgll3 allele - puberty link

Per Gunnar Fjelldal, Tom Johnny Hansen, Anna Wargelius, Fernando Ayllon, Kevin Alan Glover, Rüdiger W. Schulz, Thomas Fraser

BMC Genetics 21

2020

Vertebral deformities in interspecific diploid and triploid salmonid hybrids

Thomas Fraser, Tom Johnny Hansen, Florian Sambraus, Per Gunnar Fjelldal

Journal of Fish Biology

2020

Effects of laboratory salmon louse infection on osmoregulation, growth and survival in Atlantic salmon

Per Gunnar Fjelldal, Tom Johnny Hansen, Ørjan Karlsen

Conservation Physiology 8 p. 1-10

2020

A transcriptomic analysis of diploid and triploid Atlantic salmon lenses with and without cataracts

Pål Asgeir Olsvik, Roderick Nigel Finn, Sofie C. Remø, Per Gunnar Fjelldal, Francois Chauvigné, Kevin Glover, Tom Johnny Hansen, Rune Waagbø

Experimental Eye Research 199 p. 1-14

2020

No environmental effect on vaccine-induced reduced growth in Atlantic salmon Salmo salar smolts

Thomas WB Fraser, Per Gunnar Fjelldal, Ingunn Sommerset, Tina Søfteland, Ole Høstmark, Mark D Powell, Vegar Heen, Tom Johnny Hansen

Aquaculture Environment Interactions 12 p. 327-338

2020

Autosomal sdY pseudogenes explain discordances between phenotypic sex and DNA marker for sex identification in Atlantic salmon

Fernando Ayllon, Monica Favnebøe Solberg, Francois Besnier, Per Gunnar Fjelldal, Tom Johnny Hansen, Anna Wargelius, Rolf Brudvik Edvardsen, Kevin Glover

Frontiers in Genetics 11 p. 1-10

2020

Production and verification of the first Atlantic salmon (Salmo salar L.) clonal lines

Tom Johnny Hansen, David J. Penman, Kevin Glover, Thomas Fraser, Tone Vågseth, Anders Thorsen, Anne Grete Eide Sørvik, Per Gunnar Fjelldal

BMC Genetics 21

2020

Chromosome aberrations in pressure-induced triploid Atlantic salmon

Kevin Glover, Alison C. Harvey, Tom Johnny Hansen, Per Gunnar Fjelldal, Francois Besnier, J.B. Bos, Fernando Ayllon, John B. Taggart, Monica Favnebøe Solberg

BMC Genetics 21 p. 59

2019

Salmon lice threaten growth, osmoregulation and survival in anadromous Arctic char post-smolts

Per Gunnar Fjelldal, Tom Johnny Hansen, Ørjan Karlsen, Daniel William Wright

Conservation Physiology 7

2019

Visualization of CCL19-like transcripts in the ILT, thymus and head kidney of Atlantic salmon (Salmo salar L.)

Håvard Bjørgen, Oskar Mongstad Løken, Ida Bergva Aas, Per Gunnar Fjelldal, Tom Johnny Hansen, Lars Austbø, Erling Olaf Koppang

Fish and Shellfish Immunology 93 p. 763-765

2019

The influence of vgll3 genotypes on sea age at maturity is altered in farmed mowi strain Atlantic salmon

Fernando Ayllon, Monica Favnebøe Solberg, Kevin Glover, Faezeh Mohammadi, Erik Nordtorp Kjærner-Semb, Per Gunnar Fjelldal, Eva Andersson, Tom Johnny Hansen, Rolf Edvardsen, Anna Wargelius

BMC Genetics 20:44 p. 1-8

2019

Experimental investigation of the effects of temperature and feeding regime on scale growth in Atlantic salmon Salmo salar post-smolts

Katie Thomas, Tom Johnny Hansen, Deirdre Brophy, Niall O Maoileidigh, Per Gunnar Fjelldal

Journal of Fish Biology 94 p. 896-908

2019

Termination of puberty in out-of-season male Atlantic salmon smolts

Thomas Fraser, Per Gunnar Fjelldal, Rüdiger W. Schulz, Birgitta Norberg, Tom Johnny Hansen

Comparative Biochemistry and Physiology A 232 p. 60-66

2018

Radiological changes during fracture and repair in neural and haemal spines of Atlantic cod (Gadus morhua)

Per Gunnar Fjelldal, Terje van der Meeren, Thomas Fraser, Florian Sambraus, Laith A. Jawad, Tom Johnny Hansen

Journal of Fish Diseases 41 p. 1871-1875

2018

Vertebral column deformity in adult wild haddock(Melanogrammus aeglefinus)

Laith A. Jawad, Tom Johnny Hansen, Sonnich Meier, Jon Egil Skjæraasen, Per Gunnar Fjelldal

Journal of Fish Diseases 41 p. 1909-1915

2018

Documentation of multiple species of marine fish trapped in Atlantic salmon sea-cages in Norway

Per Gunnar Fjelldal, Monica Favnebøe Solberg, Kevin Glover, Ole Folkedal, Jonatan Nilsson, Roderick Nigel Finn, Tom Johnny Hansen

Aquatic Living Resources 31

2018

Sexual maturation and smoltification in domesticated Atlantic salmon (Salmo salar L.) - is there a developmental conflict?

Per Gunnar Fjelldal, Rüdiger W. Schulz, Tom Ole Nilsen, Eva Andersson, Birgitta Norberg, Tom Johnny Hansen

Physiological Reports 6 p. 1-18

2018

Vgll3 and the Hippo pathway are regulated in Sertoli cells upon entry and during puberty in Atlantic salmon testis

Erik Nordtorp Kjærner-Semb, Fernando Ayllon, Lene Kleppe, Elin Sørhus, Kai Ove Skaftnesmo, Tomasz Furmanek, Frida Thyri Segafredo, Anders Thorsen, Per Gunnar Fjelldal, Tom Johnny Hansen, Geir Lasse Taranger, Eva Andersson, Rüdiger W. Schulz, Anna Wargelius, Rolf Edvardsen

Scientific Reports 8:1912 p. 1-11

2018

Changes in water temperature and oxygen: the effect of triploidy on performance and metabolism in large farmed Atlantic salmon

Florian Sambraus, Mette Remen, Rolf Erik Olsen, Tom Johnny Hansen, Rune Waagbø, Thomas Torgersen, Erik-Jan Lock, Albert Imsland, Thomas Fraser, Per Gunnar Fjelldal

Aquaculture Environment Interactions 10 p. 157-172

2017

Effects of temperature on feed intake and plasma chemistry after exhaustive exercise in triploid brown trout (Salmo trutta L).

Andrew C. Preston, John F. Taylor, Per Gunnar Fjelldal, Tom Johnny Hansen, Hervé Migaud

43 p. 337-350

2017

Rapid growth causes abnormal vaterite formation in farmed fish otoliths

Tormey Reimer, Timothy David Dempster, Anna Wargelius, Per Gunnar Fjelldal, Tom Johnny Hansen, Kevin Glover, Monica Favnebøe Solberg, Stephen E. Swearer

Journal of Experimental Biology 220 p. 2965-2969

2017

Cloned and outbred Atlantic salmon display equal parasite dispersion when infected with the salmon louse

Kevin Glover, Tom Johnny Hansen, Francois Besnier, Monica Favnebøe Solberg, Per Gunnar Fjelldal, Anne Grete Eide Sørvik, Sussie Dalvin, Frank Nilsen

Aquaculture 480 p. 83-88

2017

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Tom Johnny Hansen, Per Gunnar Fjelldal, Ole Folkedal, Tone Vågseth, Frode Oppedal

Aquaculture Environment Interactions p. 193-204

2017

Water temperature and dietary histidine affect cataract formation in Atlantic salmon (Salmo salar L.) diploid and triploid yearling smolt

Florian Sambraus, Per Gunnar Fjelldal, Sofie C. Remø, Ernst Morten Hevrøy, Tom Ole Nilsen, Anders Thorsen, Tom Johnny Hansen, Rune Waagbø

Journal of Fish Diseases 40 p. 1195-1212

2017

Water temperature and oxygen: The effect of triploidy on performance and metabolism in farmed Atlantic salmon (Salmo salar L.) post-smolts

Florian Sambraus, Rolf Erik Olsen, Mette Remen, Tom Johnny Hansen, Thomas Torgersen, Per Gunnar Fjelldal

Aquaculture 473 p. 1-12

2017

Ploidy elicits a whole-genome dosage effect: growth of triploid Atlantic salmon is linked to the genetic origin of the second maternal chromosome set

Alison C. Harvey, Per Gunnar Fjelldal, Monica Favnebøe Solberg, Tom Johnny Hansen, Kevin Glover

BMC Genetics 18:34 p. 1-12

2016

Epithelial Label-Retaining Cells Are Absent during Tooth Cycling in Salmo salar and Polypterus senegalus

Sam Vandenplas, Maxime Willems, P. Eckhard Witten, Tom Johnny Hansen, Per Gunnar Fjelldal, Ann Huysseune

PLOS ONE

2016

Effects of temperature on feed intake and plasma chemistry after exhaustive exercise in triploid brown trout (Salmo trutta L)

Andrew C. Preston, John F. Tylor, Per Gunnar Fjelldal, Tom Johnny Hansen, Hevré Migaud

Fish Physiology & Biochemistry p. 1-14

2016

First report on vertebral abnormality in the fivebeard rockling Ciliata mustela (Linnaeus, 1758) (Osteichthyes: Lotidae) from Masfjorden, Western Norway

L.A Jawad, Per Gunnar Fjelldal, Tom Johnny Hansen

Marine Biodiversity p. 1-5

2016

Salmonid fish: model organisms to study cardiovascular morphogenesis in conjoined twins?

Per Gunnar Fjelldal, Monica Favnebøe Solberg, Tom Johnny Hansen, Tone Vågseth, Kevin Glover, Harald Kryvi

BMC Developmental Biology 16:25

2016

Effects of temperature on the final stages of sexual maturation in Atlantic salmon (Salmo salar L.)

Erik J.M Vikingstad, Eva Andersson, Tom Johnny Hansen, Birgitta Norberg, Ian Mayer, Sigurd Olav Stefansson, Per Gunnar Fjelldal, Geir Lasse Taranger

Fish Physiology & Biochemistry 42 p. 895-907

2016

Increased dietary phosphorous prevents vertebral deformities in triploid Atlantic salmon (Salmo salar L.)

Per Gunnar Fjelldal, Tom Johnny Hansen, Erik-Jan Lock, Anna Wargelius, Thomas Fraser, Florian Sambraus, A. El-Mowafi, Sissel Albrektsen, Rune Waagbø, Robin Ørnsrud

Aquaculture Nutrition 22 p. 72-90

2015

Mass marking farmed Atlantic salmon with transgenerational isotopic fingerprints to trace farm fish escapees

Fletcher Warren-Myers, Timothy David Dempster, Per Gunnar Fjelldal, Tom Johnny Hansen, Stephen E. Swearer

Aquaculture Environment Interactions 7 p. 75-87

2015

Effects of photoperiod and melatonin implants on feed intake in Atlantic salmon (Salmo salar L.) postsmolts

Silvia Maiolo, Tom Johnny Hansen, Giuliana Parisi, Rolf Erik Olsen

Italian Journal of Animal Science 14 p. 664-669

2015

Role of the GH-IGF-1 system in Atlantic salmon and rainbow trout postsmolts at elevated water temperature

Ernst Morten Hevrøy, Cristian K. Tipsmark, Sofie C. Remø, Tom Johnny Hansen, Miki Fukuda, Thomas Torgersen, Vibeke Vikeså, Pål Asgeir Olsvik, Rune Waagbø, Munetaka Shimizu

Comparative Biochemistry and Physiology A 188 p. 127-138

2015

Piscine orthoreovirus (PRV) in red and melanised foci in white muscle of Atlantic salmon (Salmo salar)

Håvard Bjørgen, Øystein Wessel, Per Gunnar Fjelldal, Tom Johnny Hansen, Harald Sveier, Håkon Rydland Sæbø, Katrine Bones Enger, Erik Monsen, Agnar Ståle Kvellestad, Espen Rimstad, Erling Olaf Koppang

Veterinary research (VR) 46:89

2015

Increased reactivity and monoamine dysregulation following stress in triploid Atlantic salmon (Salmo salar)

Thomas Fraser, Marco Antonio Vindas, Per Gunnar Fjelldal, Svante Winberg, Per-Ove Thörnqvist, Øyvind Øverli, Jon Egil Skjæraasen, Tom Johnny Hansen, Ian Mayer

Comparative Biochemistry and Physiology A 185 p. 125-131

2015

The frequency of spontaneous triploidy in farmed Atlantic salmon produced in Norway during the period 2007–2014

Kevin Glover, Abdullah Sami Madhun, Geir Dahle, Anne Grete Eide Sørvik, Vidar Wennevik, Øystein Skaala, Hugh Craig Morton, Tom Johnny Hansen, Per Gunnar Fjelldal

BMC Genetics 16

2015

A report on overripe female and spent male Atlantic salmon (Salmo salar) in August

Tom Johnny Hansen, Mette Remen, Florian Sambraus, Per Gunnar Fjelldal

Aquaculture 444 p. 114-116

2015

The interbranchial lymphoid tissue of Atlantic Salmon (Salmo salar L) extends as a diffuse mucosal lymphoid tissue throughout the trailing edge of the gill filament

Alf Seljenes Dalum, Lars Austbø, Håvard Bjørgen, Karsten Skjødt, Ivar Hordvik, Tom Johnny Hansen, Per Gunnar Fjelldal, Charles McLean Press, David Griffiths, Erling Olaf Koppang

Journal of morphology 276 p. 1075-1088

2015

An Industry-Scale Mass Marking Technique for Tracing Farmed Fish Escapees

Fletcher Warren-Myers, Tim Demster, Per Gunnar Fjelldal, Tom Johnny Hansen, Stephen E. Swearer

PLOS ONE 10

2015

Immersion during egg swelling results in rapid uptake of stable isotope markers in salmonid otoliths

Fletcher Warren-Myers, Tim Dempster, Per Gunnar Fjelldal, Tom Johnny Hansen, Stephen E. Swearer

Canadian Journal of Fisheries and Aquatic Sciences 72 p. 722-727

2015

The prevalence of vertebral deformities is increased with higher egg incubation temperatures and triploidy in Atlantic salmon Salmo salar L.

Thomas Fraser, Tom Johnny Hansen, Mitchell Fleming, Per Gunnar Fjelldal

Journal of Fish Diseases 38 p. 75-89

2015

Effect of water oxygen level on performance of diploid and triploid Atlantic salmon post-smolts reared at high temperature

Tom Johnny Hansen, Rolf Erik Olsen, Lars Helge Stien, Frode Oppedal, Thomas Torgersen, Olav Breck, Mette Remen, Tone Vågseth, Per Gunnar Fjelldal

Aquaculture 435 p. 354-360

2015

Vaccination and triploidy increase relative heart weight in farmed Atlantic salmon, Salmo salar L

Tom Fraser, Ian Mayer, Tom Johnny Hansen, Trygve Poppe, Jon Egil Skjæraasen, Erling Olaf Koppang, Per Gunnar Fjelldal

Journal of Fish Diseases 38 p. 151-160

2014

Developmental stability in vaccinated Atlantic salmon (Salmo salar L.): Deformities and fluctuating asymmetry of bone structures

A. O. Yurtseva, D. L. Lajus, Arne Erik Berg, Per Gunnar Fjelldal, Tom Johnny Hansen

Paleontological journal 48 p. 1266-1274

2014

The effect of triploidy on the efficacy and physiological response to anesthesia with MS 222 and isoeugenol in Atlantic salmon post-smolts

Tom Fraser, Ian Mayer, Jon Egil Skjæraasen, Tom Johnny Hansen, Per Gunnar Fjelldal

Aquaculture International 22 p. 1347-1359

2014

Triploid (sterile) farmed Atlantic salmon males attempt to spawn with wild females

Per Gunnar Fjelldal, Vidar Wennevik, I.A Fleming, Tom Johnny Hansen, Kevin Glover

Aquaculture Environment Interactions 5

2014

Vertebra deformities in wild Atlantic salmon caught in the Figgjo River, southwest Norway

Florian Sambraus, Kevin Glover, Tom Johnny Hansen, Tom Fraser, Monica Favnebøe Solberg, Per Gunnar Fjelldal

Journal of Applied Ichthyology 30 p. 777-782

2014

Hybrid salmonids: Ploidy effect on skeletal meristic characteristics and sea lice infection susceptibility

Mitchell Fleming, Tom Johnny Hansen, Ole Fredrik Skulstad, Kevin Glover, Hugh Craig Morton, Leif Asbjørn Vøllestad, Per Gunnar Fjelldal

Journal of Applied Ichthyology 30 p. 746-752

2014

The production regime influences the migratory behaviour of escaped farmed Atlantic salmon

Ove Tommy Skilbrei, Ole Fredrik Skulstad, Tom Johnny Hansen

Aquaculture 424-425 p. 146-150

2014

Aplasia of the septum transversum has no effect on plasma biochemistry following an acute hypoxic event in Atlantic salmon

Tom Fraser, Per Gunnar Fjelldal, Tom Johnny Hansen, Frode Oppedal, Rolf Erik Olsen, Tone Vågseth, Mette Remen

Diseases of Aquatic Organisms 111 p. 87-92

2014

The effect of triploidy on vaccine side-effects in Atlantic salmon

Tom Fraser, Tom Johnny Hansen, Ian Mayer, Jon Egil Skjæraasen, Kevin Glover, Florian Sambraus, Per Gunnar Fjelldal

Aquaculture 433 p. 481-490

2014

Osmotic induction improves batch marking of larval Fish otoliths with enriched stable isotopes

Emmanuel de Braux, Fletcher Warren-Myers, Tim Demster, Per Gunnar Fjelldal, Tom Johnny Hansen, Stephen E. Swearer

ICES Journal of Marine Science 71 p. 2530-2538

2014

Immune parameters in the intestine of wild and reared unvaccinated and vaccinated Atlantic salmon (Salmo salar L.)

Guro Løkka, Lars Austbø, Knut Falk, Erin Bromage, Per Gunnar Fjelldal, Tom Johnny Hansen, Ivar Hordvik, Erling Olaf Koppang

Developmental and Comparative Immunology 47 p. 6-16

2014

Cardiac responses to elevated seawater temperature in Atlantic salmon

Sven Martin Jørgensen, Vicente Castro, Aleksei Krasnov, Jacob Torgersen, Gerrit Timmerhaus, Ernst Morten Hevrøy, Tom Johnny Hansen, Sissel Tjøstheim Susort, Olav Breck, Harald Rune Takle

BMC Physiology 14

2014

The effect of vaccination, ploidy and smolt production regime on pathological melanin depositions in muscle tissue of Atlantic salmon, Salmo salar L

Hilde Larsen, Lars Austbø, Ane Nødtvedt, Tom Fraser, Espen Rimstad, Per Gunnar Fjelldal, Tom Johnny Hansen, Erling Olaf Koppang

Journal of Fish Diseases 37 p. 327-340

2014

The effect of ploidy and incubation temperature on survival and the prevalence of aplasia of the septum transversum in Atlantic salmon, Salmo salar L

Tom Fraser, Mitchell Fleming, Trygve Poppe, Tom Johnny Hansen, Per Gunnar Fjelldal

Journal of Fish Diseases 37 p. 189-200

2013

The effect of triploidy on the culture performance, deformity prevalence, and heart morphology in Atlantic salmon

Tom Fraser, Tom Johnny Hansen, Jon Egil Skjæraasen, Ian Mayer, Florian Sambraus, Per Gunnar Fjelldal

Aquaculture 416-417 p. 255-264

2013

Induction and advancement of ovulation in wild Arctic grayling (Thymallus arcticus arcticus) using D-Tle(6),Pro(9),NEt-mGnRHa Lecirelin

Viktor Svinger, Tom Johnny Hansen, Yacheslav Shadrin, Tomas Policar, Jan Kouril

Czech Journal of Animal Science 58 p. 8-14

2013

Regional changes in vertebra morphology during ontogeny reflect the life history of Atlantic cod (Gadus morhua L.)

Per Gunnar Fjelldal, Geir Kåre Totland, Tom Johnny Hansen, Harald Kryvi, Xiyuan Wang, Jens L. Søndergaard, Sindre Grotmol

Journal of Anatomy 222 p. 615-624

2013

GH-IGF system regulation of attenuated muscle growth and lipolysis in Atlantic salmon reared at elevated sea temperatures

Ernst Morten Hevrøy, Christine Hunskår, Stefan de Gelder, Munetaka Shimizu, Rune Waagbø, Olav Breck, Harald Rune Takle, Sissel Sussort, Tom Johnny Hansen

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology 183 p. 243-259

2013

Low light intensity can reduce Atlantic salmon smolt quality

Sigurd O Handeland, Albert Imsland, Lars O.E. Ebbesson, Tom Ole Nilsen, Camilla Diesen Hosfeld, Grete Bæverfjord, Åsa Maria Olofsdotter Espmark, Trond Rosten, Ove Tommy Skilbrei, Tom Johnny Hansen, Gunnar Steinn Gunnarsson, Olav Breck, Sigurd Olav Stefansson

Aquaculture 384 p. 19-24

2013

The effect of triploidization of Atlantic cod (Gadus morhua L.) on survival, growth and deformities during early life stages

Ingegjerd Opstad, Per Gunnar Fjelldal, Ørjan Karlsen, Anders Thorsen, Tom Johnny Hansen, Geir Lasse Taranger

Aquaculture 388 p. 54-59

2012

Triploidy alters brain morphology in pre-smolt Atlantic salmon Salmo salar: possible implications for behaviour

Tom Fraser, Per Gunnar Fjelldal, Jon Egil Skjæraasen, Tom Johnny Hansen, Ian Mayer

Journal of Fish Biology 81 p. 2199-2212

2012

Continuous light induces bone resorption and affects vertebral morphology in Atlantic salmon (Salmo salar L.) fed a phosphorous deficient diet

Per Gunnar Fjelldal, Erik-Jan Lock, Tom Johnny Hansen, Rune Waagbø, Anna Wargelius, Laura Gil Martens, Adel El-Mowafi, Robin Ørnsrud

Aquaculture Nutrition 18 p. 610-619

2012

Vaccination and elevated dietary phosphorus reduces the incidence of early sexual maturation in Atlantic salmon (Salmo salar L.)

Per Gunnar Fjelldal, Albert Imsland, Tom Johnny Hansen

Aquaculture 364 p. 333-337

2012

Ghrelin is involved in voluntary anorexia in Atlantic salmon farmed at elevated sea temperatures

Ernst Morten Hevrøy, Rune Waagbø, Bente Elisabeth Torstensen, Harald Rune Takle, Ingunn Stubhaug, Sven Martin Jørgensen, Thomas Torgersen, Leif Tvenning, Sissel Tjøstheim Susort, Olav Breck, Tom Johnny Hansen

General and Comparative Endocrinology 175 p. 118-134

2012

Inadequate phosphorus nutrition in juvenile Atlantic salmon has a negative effect on long-term bone health

Per Gunnar Fjelldal, Tom Johnny Hansen, Sissel Albrektsen

Aquaculture 334 p. 117-123

2012

Dietary phosphorus does not reduce the risk for spinal deformities in a model of adjuvant-induced inflammation in Atlantic salmon (Salmo salar) postsmolts

Laura Gil Martens, Per Gunnar Fjelldal, Erik-Jan Lock, Anna Sofie Troedsson Wargelius, Heidrun Inger Wergeland, P. Eckhard Witten, Tom Johnny Hansen, Rune Waagbø, Robin Ørnsrud

Aquaculture Nutrition 18 p. 12-20

2012

Welfare Considerations of Triploid Fish

Tom Fraser, Per Gunnar Fjelldal, Tom Johnny Hansen, Ian Mayer

Reviews in fisheries science 20 p. 192-211

2012

The pattern of the lower jaw dentition in farmed Atlantic salmon (Salmo salar): a tool to study mechanisms of tooth replacement?

Ann Huysseune, Sam Vandenplas, B. De Groeve, Per Gunnar Fjelldal, Tom Johnny Hansen

Journal of Applied Ichthyology 28 p. 330-335

2012

Vaccinated farmed Atlantic salmon are susceptible to spinal and skull deformities

Arne Erik Berg, Anastasia Yurtseva, Tom Johnny Hansen, Dmitry Lajus, Per Gunnar Fjelldal

Journal of Applied Ichthyology 28 p. 446-452

2012

Vertebral deformities in farmed Atlantic salmon (Salmo salar L.) - etiology and pathology

Per Gunnar Fjelldal, Tom Johnny Hansen, Olav Breck, Robin Ørnsrud, Erik-Jan Lock, Rune Waagbø, Anna Wargelius, Paul Eckhard Witten

Journal of Applied Ichthyology 28 p. 433-440

2011

Induction of meiotic gynogenesis in Atlantic cod, Gadus morhua (L.)

Håkon Magne Otterå, Anders Thorsen, Stefano Peruzzi, Geir Dahle, Tom Johnny Hansen, Ørjan Karlsen

Journal of Applied Ichthyology 27 p. 1298-1302

2011

Sustained swimming increases the mineral content and osteocyte density of salmon vertebral bone

Geir Kåre Totland, Per Gunnar Fjelldal, Harald Kryvi, Guro Løkka, Anna Sofie Troedsson Wargelius, Anita Sagstad, Tom Johnny Hansen, Sindre Grotmol

Journal of Anatomy 219 p. 490-501

2011

Continuous light and elevated temperature can trigger maturation both during and immediately after smoltification in male Atlantic salmon (Salmo salar)

Per Gunnar Fjelldal, Tom Johnny Hansen, Tien-Sheng Huang

Aquaculture 321 p. 93-100

2011

Comparative seawater performance and deformity prevalence in out-of-season diploid and triploid Atlantic salmon (Salmo salar) post-smolts

E Leclercq, J. Taylor, D Fison, Per Gunnar Fjelldal, M Diez-Padrisa, Tom Johnny Hansen, H Migaud

Comparative Biochemistry and Physiology - Part A: Comparative Physiology 158 p. 116-125

2011

The effect of water temperature on vertebral deformities and vaccine-induced abdominal lesions in Atlantic salmon, Salmo salar L

Ane Grini, Tom Johnny Hansen, Arne Berg, Anna Wargelius, Per Gunnar Fjelldal

Journal of Fish Diseases 34 p. 531-546

2011

Identification of vimentin- and elastin-like transcripts specifically expressed in developing notochord of Atlantic salmon (Salmo salar L.)

Anita Sagstad, Sindre Grotmol, Harald Kryvi, Christel Krossøy, Geir Kåre Totland, Ketil Malde, Shou Wang, Tom Johnny Hansen, Anna Sofie Troedsson Wargelius

Cell and Tissue Research 346 p. 191-202

2010

Vertebral deformities in triploid Atlantic salmon (Salmo salar L.) underyearling smolts

Per Gunnar Fjelldal, Tom Johnny Hansen

Aquaculture 309 p. 131-136

2010

A possible relation between growth and number of deformed vertebrae in Atlantic Salmon (Salmo salar L.)

Tom Johnny Hansen, Per Gunnar Fjelldal, Anastasia Yurtseva, Arne Erik Berg

Journal of Applied Ichthyology 26 p. 355-359

2010

Collagen type XI alpha 1 may be involved in the structural plasticity of the vertebral column in Atlantic salmon (Salmo salar L.)

Anna Wargelius, Per Gunnar Fjelldal, Ulla Nordgarden, Ane Grini, Christel Krossøy, Sindre Grotmol, Geir Kåre Totland, Tom Hansen

Journal of Experimental Biology 213 p. 1207-1216

2010

Do capital breeders like Atlantic herring (Clupea harengus) exhibit sensitive periods of nutritional control on ovary development and fecundity regulation?

James Kennedy, Jon Egil Skjæraasen, Richard David Marriot Nash, Anders Thorsen, Aril Slotte, Tom Hansen, Olav Sigurd Kjesbu

Canadian Journal of Fisheries and Aquatic Sciences 67 p. 16-27

2009

Continuous light affects mineralization and delays osteoid incorporation in vertebral bone of Atlantic salmon (Salmo Salar L.)

Anna Wargelius, Per Gunnar Fjelldal, Ulla Nordgarden, Tom Johnny Hansen

Journal of Experimental Biology 212 p. 656-661

2009

A radiological study on vertebral deformities in cultured and wild Atlantic cod (Gadus morhua, L.)

Per Gunnar Fjelldal, Terje van der Meeren, Knut Eirik Jørstad, Tom Johnny Hansen

Aquaculture 289 p. 6-12

2009

Oocyte development in captive Atlantic horse mackerel Trachurus trachurus

Hilkka Opolili Ndahafa Ndjaula, Tom Hansen, Maria Krüger-Johnsen, Olav Sigurd Kjesbu

ICES Journal of Marine Science 66 p. 623-630

2009

Vertebral body mineralization and deformities in cultured Atlantic salmon (Salmo salar L.): Effects of genetics and off-season smolt production

Per Gunnar Fjelldal, Kevin A. Glover, Øystein Skaala, Albert Imsland, Tom Johnny Hansen

Aquaculture 296 p. 36-44

2009

Supplementation of dietary minerals during the early seawater phase increase vertebral strength and reduce the prevalence of vertebral deformities in fast-growing under-yearling Atlantic salmon (Salmo salar L.) smolt

P.G. Fjelldal, Tom Johnny Hansen, Olav Breck, R. Sandvik, Rune Waagbø, A. Berg, ROBIN ØRNSRUD

Aquaculture Nutrition 15 p. 366-378

2008

The acute stress response in fed and food deprived Atlantic cod, Gadus morhua L

Rolf erik Olsen, Kristina Sundell, Einar Ringø, Reidar Myklebust, Gro Ingun Hemre, Ørjan Karlsen, Tom Hansen, O Karlsen

Aquaculture 280 p. 232-241

2007

A radiological study on the development of vertebral deformities in cultured Atlantic salmon (Salmo salar L)

Arne Erik Berg, Tom Johnny Hansen, Per Gunnar Fjelldal

Aquaculture 273 p. 721-728

2007

The mineral content affects vertebral morphology in underyearling smolt of Atlantic salmon (Salmo salar L.)

Per Gunnar Fjelldal, Tom Johnny Hansen, Ulla Nordgarden

Aquaculture 270 p. 231-239

2007

Fish size at vaccination influence the development of side effects in Atlantic salmon (Salmo salar L.)

Odd Magne Rødseth, Arne Erik Berg, Tom Johnny Hansen

Aquaculture 265 p. 9-15

2007

Developmental stage of Atlantic salmon parr regulates pituitary GH secretion and parr-smolt transformation

Ulla Nordgarden, Bjørn Thrandur Bjørnsson, Tom Johnny Hansen

Aquaculture 264 p. 441-448

2006

Time of vaccination influences development of adherences, growth and spinal deformities in Atlantic salmon (Salmo salar L.)

Arne Erik Berg, Tom Johnny Hansen, Odd Magne Rødseth, Arild Tangerås

Diseases of Aquatic Organisms 69 p. 239-248

2006

Continuous light delay sexual maturation and increase growth of Atlantic cod (Gadus morhua L.) in sea cages

Leiv Å. Aardal, Geir Lasse Taranger, Tom Johnny Hansen, Olav Sigurd Kjesbu

ICES Journal of Marine Science 63 p. 365-375

2006

Growth hormone and insulin-like growth factor-I act together and independently when regulating growth in vertebral and muscle tissue of Atlantic salmon postsmolts

Ulla Nordgarden, Per Gunnar Fjelldal, Tom Johnny Hansen, Bjørn Thrandur Bjørnsson, Anna Wargelius

General and Comparative Endocrinology 149 p. 253-260

2006

Photoperiod in seawater influence seasonal growth and chemical composition in autumn sea-transferred Atlantic salmon (Salmo salar L.) given two vaccines

Frode Oppedal, Rolf Erik Olsen, Tom Johnny Hansen, Arne Erik Berg, Geir Lasse Taranger

Aquaculture 254 p. 396-410

2006

Insight into the complex genetic network of tetraploid Atlantic salmon (Salmo salar L.): Description of multiple novel Pax7 splice variants

Susan Gotensparre, Eva Andersson, Anna Wargelius, Tom Johnny Hansen, Ian A. Johnston

Gene 373 p. 8-15

2005

Endocrine growth regulation of adult Atlantic salmon in seawater: The effects of light regime on plasma growth hormone, insulin-like growth factor-I, and insulin levels

Ulla Nordgarden, Tom Johnny Hansen, Gro Ingunn Hemre, Bjørn Thrandur Bjørnsson, Anne Sundby

Aquaculture 250 p. 862-871

2005

A peak in gh-receptor expression is associated with growth activation in Atlantic salmon vertebrae, while upregulation of igf-I receptor expression is related to increased bone density

Anna Wargelius, Per Gunnar Fjelldal, Tom Johnny Hansen, Bjørn Thrandur Bjørnsson, Ulla Nordgarden, Susana Benedet

General and Comparative Endocrinology 142 p. 163-168

2005

Heat shock during early somitogenesis induces caudal vertebral column defects in Atlantic salmon (Salmo salar)

Anna Wargelius, Per Gunnar Fjelldal, Tom Johnny Hansen

Development, Genes and Evolution 215 p. 350-357

2005

Vertebrae of the trunk and tail display different growth rates in response to photoperiod in Atlantic salmon, Salmo salar L., post-smolts

Per Gunnar Fjelldal, Ulla Nordgarden, Arne Erik Berg, Anna Wargelius, Sindre Grotmol, Geir Kåre Totland, Tom Johnny Hansen

Aquaculture 250 p. 516-524

2004

Spring growth in the vertebrae of Atlantic salmon (Salmo salar) is characterized by a gradual increase in ihh expression, while a certain photoperiod triggers shh induction

Tom Johnny Hansen, Arne Erik Berg, Per Gunnar Fjelldal, Anna Wargelius, Ulla Nordgarden

Journal of Bone and Mineral Research 19 p. 217

2004

Effects of pre-smolt photoperiod regimes on post-smolt growth rates of different genetic groups of Atlantic salmon (Salmo salar)

Tom Johnny Hansen, Ove Tommy Skilbrei

Aquaculture 242 p. 671-688

2004

Pinealectomy induces malformation of the spine and reduces the mechanical strength of the vertebrae in Atlantic salmon, Salmo salar

PG Fjelldal, Sindre Grotmol, Harald Kryvi, Nils Roar Gjerdet, GL Taranger, Tom Hansen, MJR Porter, Geir Kåre Totland

Journal of Pineal Research 36 p. 132-139

2003

Seasonal changing metabolism in Atlantic salmon (Salmo salar L.) II – β-oxidation capasity and fatty acid composition in muscle tissues and plasma lipoproteins

Ulla Nordgarden, Bente Elisabeth Torstensen, Livar Frøyland, Tom Johnny Hansen, Gro Ingunn Hemre

Aquaculture Nutrition 9 p. 295-303

2003

Muscle growth in juvenile Atlantic salmon as influenced by temperature in the egg and yolk stages and diet protein level

Marit Bjørnevik, Tom Johnny Hansen, Chris Beattie, Anders Kiessling

Journal of Fish Biology 62 p. 1159-1175

2003

Seasonal changes in selected muscle quality parameters in Atlantic salmon (Salmo salar L.) reared under natural and continuous light

Robin Ørnsrud, Tom Johnny Hansen, Gro Ingunn Hemre, Ulla Nordgarden

Aquaculture Nutrition 9 p. 161-168

2003

Growth performance and sexual maturation in diploid and triploid Atlantic salmon (Salmo salar L.) in seawater tanks exposed to continuous light or simulated natural photoperiod

Frode Oppedal, Geir Lasse Taranger, Tom Johnny Hansen

Aquaculture 215 p. 145-162

2003

Seasonally changing metabolism in Atlantic salmon (Salmo salar L.) I – Growth and feed conversion ratio

Ulla Nordgarden, Frode Oppedal, Geir Lasse Taranger, Gro Ingunn Hemre, Tom Johnny Hansen

Aquaculture Nutrition 9 p. 287-293

2003

Effects of photoperiod, temperature and GnRHa treatment on the reproductive physiology of Atlantic salmon (Salmo salar L.) broodstock

Geir Lasse Taranger, E. Vikingstad, U Klenke, Ian Mayer, S.O Stefansson, Birgitta Norberg, Tom Johnny Hansen, Y Zohar, Eva Andersson

Fish Physiology & Biochemistry 28 p. 403-406

2002

Growth and salt-water tolerance of juvenile Atlantic salmon, Salmo salar reared under different combinations of dietary carbohydrate and photoperiod regimes

Gro Ingunn Hemre, Marit Bjørnevik, Bjørn Thrandur Bjørnsson, Tom Johnny Hansen, Chris Beattie

Aquaculture Nutrition 8 p. 23-32

2002

Growth and body composition of Atlantic salmon (Salmo salar L.) parr and smolt fed diets varying in protein and lipid contents

Gro Ingunn Hemre, Tom Johnny Hansen, Ulla Nordgarden

Aquaculture 207 p. 65-78

2002

Gonadal development influences nutrient utilisation in cod (Gadus morhua)

Gro Ingunn Hemre, Geir Lasse Taranger, Tom Johnny Hansen

Aquaculture 214 p. 201-209

2001

Artificial light and season affect vertical distribution and swimming behaviour of post-smolt Atlantic salmon in sea cages

Frode Oppedal, Tom Johnny Hansen, Geir Lasse Taranger

Journal of Fish Biology 58 p. 1570-1584

2001

Growth, gonadal development and spawning time of Atlantic cod (Gadus morhua) reared under different photoperiods

Tom Johnny Hansen, Ørjan Karlsen, Geir Lasse Taranger, Gro Ingunn Hemre, Jens Christian Holm, Olav Sigurd Kjesbu

Aquaculture 203 p. 51-67

2000

Photoperiod regulation of plasma growth hormone levels during induced smoltification of underyearling Atlantic salmon

Bjørn Thrandur Bjørnsson, Gro Ingunn Hemre, Marit Bjørnevik, Tom Johnny Hansen

General and Comparative Endocrinology 119 p. 17-25

1999

Growth, osmoregulation and sexual maturation of underyearling Atlantic salmon smolt (Salmo salar L.) exposed to different intensities of continuous light in sea cages

Frode Oppedal, Tom Johnny Hansen, Jon-Erik Juell, Geir Lasse Taranger

Aquaculture Research 30 p. 491-499

1999

Mechanisms underlying photoperiodic effects on age at sexual maturity in Atlantic salmon, Salmo salar

Geir Lasse Taranger, C. Haux, Tom Johnny Hansen, Sigurd Olav Stefansson, Bjørn Thrandur Bjørnsson, Bernt T. Walther, Harald Kryvi

Aquaculture 177 p. 47-60

1998

Abrupt changes in photoperiod affect age at maturity, timing of ovulation and plasma testosterone and oestradiol-17 profiles in Atlantic salmon, Salmo salar

Geir Lasse Taranger, C. Haux, Sigurd Olav Stefansson, Bjørn Thrandur Bjørnsson, Bernt T. Walther, Tom Johnny Hansen

Aquaculture 162 p. 85-98

1998

Utilisation of dietary starch sources and tolerance to glucose loading in Atlantic salmon, during parr - smolt transformation

Tom Johnny Hansen, Gro Ingunn Hemre

Aquaculture 168 p. 121-138

1997

Light intensity affects growth and sexual maturation of Atlantic salmon (Salmo salar) postsmolts in sea cages

Frode Oppedal, Geir Lasse Taranger, Jan Erik Fosseidengen, Jon-Erik Juell, Tom Johnny Hansen

Aquatic Living Resources 10 p. 351-357

1997

Effects of decreases in photoperiod on growth and bimodality in Atlantic salmon Salmo salar L

Ove Tommy Skilbrei, Tom Johnny Hansen, Marianne Holm

Aquaculture Research 28 p. 43-49

1995

Aquaculture in Norway

Ole Torrissen, Jens Christian Holm, Gunnar Nævdal, Tom Johnny Hansen

World Aquaculture 26 p. 12-20

1995

Development of salinity tolerance in underyearling smolts of Atlantic salmon (Salmo salar) reared under different photoperiods

Åse Ingvill Berge, Arne Berg, Hans Jørgen Fyhn, Trygg Barnung, Tom Hansen, Sigurd Stefansson

Canadian Journal of Fisheries and Aquatic Sciences 52 p. 243-251

1995

Development of salinity tolerance in underyearling smolts of Atlantic salmon (Salmo salar) reared under different photoperiods

Åse Ingvill Berge, Arne Berg, Hans Jørgen Fyhn, Trygg Barnung, Tom Hansen, Sigurd Stefansson

Canadian Journal of Fisheries and Aquatic Sciences 52 p. 243-251

1994

Effect of reduced daylength on growth, sexual maturation and smoltification in Atlantic salmon (Salmo salar) underyearlings

Arne Erik Berg, Sigurd Olav Stefansson, Tom Johnny Hansen

Aquaculture 121 p. 289-230

1993

Ovulation and egg survival following exposure of Atlantic salmon (Salmo salar L.) broodstock to different water temperatures

Geir Lasse Taranger, Tom Johnny Hansen

Aquaculture and Fisheries Management 24 p. 151-156

1993

Growth and Parr-smolt tranformation of Atlantic Salmon (Salmo salar L.) under different light intensities and subsequent survival and growth in seawater

Sigurd Stefansson, Tom Hansen, Geir Lasse Taranger

Aquacultural Engineering 13 p. 231-243

1992

The potential for development of salinity tolerance in underyearling Atlantic salmon (Salmo salar)

R.L. Saunders, Arne Erik Berg, Tom Johnny Hansen, Sigurd Olav Stefansson

Journal of the World Aquaculture Society 23 p. 52-55

1992

Advancement and synchronization of ovulation in Atlantic salmon (Salmo salar L.) following injections of LHRH analogue

Tom Johnny Hansen, Sigurd Olav Stefansson, Geir Lasse Taranger

Aquaculture 102 p. 169-175

1991

Historical development of salmon culture

Snorre Tilseth, Dag Møller, Tom Johnny Hansen

Aquaculture 98 p. 1-9

1991

Growth and sexual maturation in Atlantic salmon (Salmo salar) reared in sea cages at two different light regimes

Tom Johnny Hansen, Sigurd Olav Stefansson, Geir Lasse Taranger

Aquaculture and Fisheries Management 23 p. 275-280

1991

First feeding of Atlantic salmon (Salmo salar) under different photoperiods

Arne Erik Berg, Tom Johnny Hansen, Sigurd Olav Stefansson

Journal of Applied Ichthyology 8 p. 251-256

1991

Multivariate approach to the study of fish growth

Ragnar Nortvedt, Tom Johnny Hansen, Frode Brakstad, Trygve Lunde, Steinar Skybakmoen

Chemometrics and Intelligent Laboratory Systems 14 p. 279-286

1990

First feeding of Atlantic salmon, Salmo salar L., under different photoperiods and light intensities

Sigurd Olav Stefansson, Ragnar Nortvedt, Tom Johnny Hansen, Geir Lasse Taranger

Aquaculture and Fisheries Management 21 p. 435-441

1990

Ascorbate 2-sulfate as a dietary vitamin C source for Atlantic salmon (Salmo salar): 1. Growth, bioactivity, haematology and humoral immune response

Tom Johnny Hansen, Kjartan Sandnes, Jan-Eirik A. Killie, Rune Waagbø

Fish Physiology & Biochemistry 8 p. 419-427

1989

The effect of spectral composition on growth and smoltification in Atlantic salmon (Salmo salar) and subsequent growth i sea cages

Sigurd Olav Stefansson, Tom Johnny Hansen

Aquaculture 82 p. 155-162

1989

Effects of tank colour on growth and smoltification of Atlantic salmon (Salmo salar L.)

Sigurd Olav Stefansson, Tom Johnny Hansen

Aquaculture 82 p. 379-386

1989

Fish roe as a major component in start-feed for marine fish larvae

Oddvar Garatun-Tjeldstø, Ingegjerd Opstad, Tom Johnny Hansen, Ingvar Huse

Aquaculture 79 p. 353-362

1989

Growth of different families of Atlantic salmon (Salmo salar) under three experimental photperiods

Sigurd Olav Stefansson, Tom Johnny Hansen, Gunnar Nævdal

Aquaculture 86 p. 271-281

1989

The influence of three unchanging photoperiods on growth and parr-smolt transformation i Atlantic salmon, (Salmo salar L.)

Sigurd Olav Stefansson, Tom Johnny Hansen, Gunnar Nævdal

Journal of Fish Biology 35 p. 237-247

1988

Norwegian salmonid smolt production: expansion versus optimization

Jens Christian Holm, Tom Johnny Hansen

Journal of Aquatic Food Product Technology 2 p. 89-98

1985

The transfer of Atlantic salmon (Salmo salar) with constricted yolk sacs to an artificial substrate

Hansen, Tom Johnny

Aquaculture 69 p. 291-297

1985

Yolk absorption, yolk sac constrictions, mortality, and growth during first feeding of Atlantic salmon (Salmo salar) incubated on astro-turf

Tom Johnny Hansen, Dag Møller

Canadian Journal of Fisheries and Aquatic Sciences 42 p. 1073-1078

1985

Artificial hatching substrate and different times of transfer to first feeding: effect on growth and protease activities of the Atlantic salmon (Salmo salar)

Tom Johnny Hansen, Krisna Rungruangsak-Torrissen

Aquaculture 48 p. 177-188

1984

Artificial hatching substrate: Effect on yolk absorbtion, mortality and growth during first feeding of sea trout (Salmo trutta)

Hansen, Tom Johnny

Aquaculture 46 p. 275-285

Other journal contributions

2019

Corrigendum to “Termination of puberty in out-of-season male Atlantic salmon smolts” (Comparative Biochemistry and Physiology, Part A (2019) 232 (60–66), (S1095643318302010), (10.1016/j.cbpa.2019.03.011))

Thomas Fraser, Per Gunnar Fjelldal, Rüdiger W. Schulz, Birgitta Norberg, Tom Johnny Hansen

Comparative Biochemistry and Physiology A 235 p. 227-228

2017

Verification of isogenic nature of clonal lines in the altantic salmon (Salmo Salar) through ddRADseq

Münevver Oral, John B. Taggart, Brendan J. McAndrew, David J Penman, Per Gunnar Fjelldal, Tom Johnny Hansen

Aquaculture 472 p. 116-116

Scientific lectures

2022

Exploring the potential in using locally sourced low-trophic resources in fish feed

Sahar Sartipiyarahmadi, Antony Jesu Prabhu Philip, Harald Sveier, Erik Jan Robert Lock, Angelico Madaro, Tom Johnny Hansen, Martin Wiech, Øivind Strand, G. Vik, Sofie C. Remø

2018

Susceptibility to salmonid alphavirus (SAV) of different salmon breed lines.

Noelia Nuñez-Ortiz, Rasmus Skern-Mauritzen, Stig Mæhle, Lindsey Moore, Tom Johnny Hansen, Per Gunnar Fjelldal, Tomasz Furmanek, Rolf Edvardsen, Samuel A. M. Martin, Sonal Patel

2018

Hvordan fungerer laksens pubertetsgen?

2016

Adaptive plasticity in Atlantic salmon- genetic predisposition of time at maturity and environmental triggers

Rolf Edvardsen, Erik Nordtorp Kjærner-Semb, Fernando Ayllon, Tomasz Furmanek, Tom Johnny Hansen, Per Gunnar Fjelldal, Carl Johan Rubin, Lene Kleppe, Kai Ove Skaftnesmo, Elin Sørhus, Faezeh Mohammadi, Geir Dahle, Vidar Wennevik, Monica Favnebøe Solberg, Kevin Glover, Birgitta Norberg, Geir Lasse Taranger, Eva Andersson, Rüdiger W. Schulz, Anna Wargelius

2015

Hvordan lysstyring påvirker vekst og kjønnsmodning hos laks.

Hansen, Tom Johnny

2014

Svakt lys holder laksen dypt, sterkt lys gir best vekst.

Frode Oppedal, Tom Johnny Hansen, Per Gunnar Fjelldal, Ole Folkedal, Morten Malm, Harald Sveier, Thomas Torgersen, Lars Helge Stien

2014

Use of artificial light (LL) to prevent sexual maturation and increase growth in salmon sea cages.

Frode Oppedal, Per Gunnar Fjelldal, Tom Johnny Hansen, Thomas Torgersen, Ole Folkedal

2014

Use of artificial light (LL) to prevent sexual maturation and increase growth in salmon sea cages.

Frode Oppedal, Per Gunnar Fjelldal, Tom Johnny Hansen, Thomas Torgersen, Ole Folkedal

2013

GLOBAL AND LOCAL METHYLATION PATTERN IN TRIPLOID AND DIPLOID AND TRIPLOID ATLANTIC SALMON

Anna Wargelius, Tomasz Furmanek, Rolf Edvardsen, Elin Sørhus, Per Gunnar Fjelldal, Tom Johnny Hansen

2010

Continuous light induces bone resorption and affects vertebral morphology in Atlantic salmon (Salmo salar L.) fed a phosphorous deficient diet

Robin Ørnsrud, Erik-Jan Lock, Tom Johnny Hansen, Rune Waagbø, Anna Wargelius, Laura Gil Martens, Adel El-Mowafi, Per Gunnar Fjelldal

2009

Dietary Fatty Acids and Inflammation in the vertebral column of Atlantic salmon (Salmo salar) smolts: A possible link to spinal deformities

Laura Gil Martens, Erik-Jan Lock, Per Gunnar Fjelldal, Anna Wargelius, Pedro Araujo, Bente Elisabeth Torstensen, Paul Eckhard Witten, Tom Johnny Hansen, Rune Waagbø, Robin Ørnsrud

2009

Deformations of the spinal column in Atlantic salmon

Per Gunnar Fjelldal, Robin Ørnsrud, Olav Breck, Anna Wargelius, Arne Berg, Kevin A. Glover, Ane Grini, Roar Sandvik, Rune Waagbø, Tom Johnny Hansen

2008

Inflammation as a risk factor for spinal deformities in farmed Atlantic salmon (Salmo salar) 0+ smolts

Laura Gil Martens, Erik Jan Robert Lock, Robin Ørnsrud, Per Gunnar Fjelldal, Anna Sofie Troedsson Wargelius, Hernandez Pedro W Araujo, Bente Elisabeth Torstensen, Paul Eckhard Witten, Tom Johnny Hansen, Rune Waagbø

2006

Growth and tissue mineralization of Atlantic salmon (Salmo salar) smolt fed soluble phosphorus (P) salts, technologically treated fish bone meal and phytase in the diet - effect of available P on vertebra morphology and bone strength

Sissel Albrektsen, Per Gunnar Fjelldal, Tom Johnny Hansen, Jogeir Toppe

2002

EFFECTS OF PHOTOPERIOD, TEMPERATURE AND GnRHa TREATMENT ON THE TIMING OF SPAWNING AND EGG AND SPERM QUALITY IN ATLANTIC SALMON (SALMO SALAR L.)

Erik Jari M Vikingstad, Eva Andersson, Ulrike Klenke, Sigurd Stefansson, Tom Hansen, Yonathan Zohar, Geir Lasse Taranger

Poster

2021

Long-term performance of gene edited, sterile Atlantic salmon - growth, smoltification, welfare indicators and fillet composition.

Lene Kleppe, Per Gunnar Fjelldal, Eva Andersson, Tom Johnny Hansen, Monica Sanden, Aina Bruvik, Kai Ove Skaftnesmo, Tomasz Furmanek, Erik Nordtorp Kjærner-Semb, Diego Crespo, Simon Flavell, Audun Ø. Pedersen, Petra Vogelsang, Anne Torsvik, Sara Olausson, Birgitta Norberg, Rüdiger W. Schulz, Jan Bogerd, Nina Santi, Rolf Brudvik Edvardsen, Anna Wargelius

2018

VGLL3 AND THE HIPPO PATHWAY ARE REGULATED IN SERTOLI CELLS UPON ENTRY AND DURING PUBERTY IN ATLANTIC SALMON TESTIS.

2014

Functional and mutagenic analyses of four water channel paralogues (Aqp0) in relation to cataractogenesis in diploid and triploid Atlantic salmon

Francois Chauvigné, Jon Anders Stavang, Geir Lasse Taranger, Per Gunnar Fjelldal, Tom Johnny Hansen, Rune Waagbø, Joan Cerdà, Roderick Nigel Finn

2013

The use of triploid salmon in Norwegian Aquaculture

Thomas WK Fraser, Tom Johnny Hansen, Ian Mayer, Kevin A. Glover, Jon Egil Skjæraasen, Vidar Wennevik, Robin Ørnsrud, Florian Sambraus, Per Gunnar Fjelldal

2013

The use of triploid salmon in Norwegian Aquaculture

Thomas WK Fraser, Tom Johnny Hansen, Ian Mayer, Jon Egil Skjæraasen, Robin Ørnsrud, Florian Sambraus, Per Gunnar Fjelldal

2013

Radiological studies on vertebral deformities in triploid Atlantic salmon (Salmo salar)

Thomas WK Fraser, Tom Johnny Hansen, M. Fleming, Florian Sambraus, Ian Mayer, Jon Egil Skjæraasen, Anna Wargelius, Robin Ørnsrud, Erik-Jan Lock, Per Gunnar Fjelldal

2013

Does triploidy affect brain morphology and neurochemistry in Atlantic salmon, Salmo salar?

Thomas WK Fraser, Joel Glover, Marco A. Vindas, Øyvind Øverli, Jon Egil Skjæraasen, Tom Johnny Hansen, Per Gunnar Fjelldal, Ian Mayer

2013

Phosphatase activities in Atlantic salmon (Salmo salar) vertebral bone and scales: our findings from the past years

Erik-Jan Lock, Per Gunnar Fjelldal, Robin Ørnsrud, Sissel Albrektsen, Tom Johnny Hansen, Rune Waagbø

2008

Inflammation as a risk factor for spinal deformities in farmed Atlantic salmon underyearling smolts

Laura Gil Martens, Erik-Jan Lock, Robin Ørnsrud, Per Gunnar Fjelldal, Anna Wargelius, Bente Elisabeth Torstensen, Paul Eckhard Witten, Tom Johnny Hansen, Rune Waagbø

Reports and dissertations

2006

Dyrevelferdsmessig risikovurdering av produksjon av 0-årssmolt. Uttalelse fra Faggruppe for Dyrehelse og Dyrevelferd (Dyrevern) i Vitenskapskomiteen for mattrygghet

Wenche Kristin Farstad, Jon Martin Arnemo, Bjarne Olai Braastad, Grete Bæverfjord, Kåre Fossum, Sigurd O Handeland, Tom Johnny Hansen, Brit Hjeltnes, Tore Håstein, Jon-Erik Juell, Solveig Nygård, Bjørn Olav Rosseland, Trond Waldemar Rosten, Sigurd Olav Stefansson, Hilde Toften, Paul Steinar Valle, Rune Waagbø, Knut Egil Bøe

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