Tom Hansen

No image
Forsker
Telefon: 91380550
Avdeling: Reproduksjon og utviklingsbiologi

Arbeidsområde

Skjelettvekst og deformasjoner

Vaksineskader

Kjønnsmodning

Steril fisk

Havforsuring

Publikasjoner

Vitenskapelige artikler (NVI)

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 W.K. Fraser, Per Gunnar Fjelldal
Aquaculture Environment Interactions
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

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 (Print) 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 (1931. Print) 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

Poster

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

Kapitler og bøker

2001

Driftsformer

Hansen, Tom Johnny
p. 383-394
1999

Measuring individual and group swimming behaviour under production densities: Test of a 3D multiple fish acoustic positioning system in a sea cage

Marie Laure Begout Anras, Sunil Kadri, Jon-Erik Juell, Tom Johnny Hansen
p. 75-78
1996

Smoltifisering hos laks - en tilpasning til livet i sjøvann

Sigurd Stefansson, Tom Hansen
p. 46-54
1987

Relationship between age at maturity and growth rate in farmed rainbow trout, Salmo gairdneri

Petter Tofteberg, Tom Johnny Hansen
p. 405-420

Populærvitenskapelige artikler

2014

Frühe Geschlechtsreife beim Bachsaibling - eine unerwünschte Eigenschaft einer für die intensive Aquakultur hoffnungsvollen Salmonidenart

Viktor Svinger, Mirek Fabianek, Petr Trnka, Dennis M Kallert, Per Gunnar Fjelldal, Tom Johnny Hansen
Fischer & Teichwirt p. 406-410
2013

VACCINATION of Atlantic salmon leads to long-lasting higher levels of serum immunoglobulin and possible skewed ratios of two distinct IgM isotypes

Atif Kamil, Per Gunnar Fjelldal, Tom Johnny Hansen, Arnt Johan Raae, Erling Olaf Koppang, Ivar Hordvik
Advances in Bioscience and Biotechnology 4 p. 85-90
2012

Triploid laks – en kandidat for kommersielt oppdrett?

Per Gunnar Fjelldal, Kevin Glover, Vidar Wennevik, Robin Ørnsrud, Tom Fraser, M. Fleming, Olav Breck, Tom Johnny Hansen
Havforskningsrapporten
2007

Optimal fôrsammensetning i tidlig sjøvannsfase kan redusere innslaget av ryggradsdeformasjoner hos høstsmolt

Per Gunnar Fjelldal, Tom Johnny Hansen, Olav Breck, Rune Waagbø, Roar Sandvik, Robin Ørnsrud
Kyst og havbruk p. 164-165

Faglige foredrag

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
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

Annet tidsskriftbidrag

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

Rapporter og avhandlinger

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
Er denne profilen din? Rediger denne profilen (logg inn)