Blar i Brage IMR på forfatter "Hansen, Tom Johnny"
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Experimental transmission of piscine orthoreovirus-1 (PRV-1) in different life stages of Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)
Kannimuthu, Dhamotharan; Roh, HyeongJin; Morton, Hugh Craig; Penaranda, Ma Michelle Demogina; Vossgård, Anne; Hansen, Tom Johnny; Fjelldal, Per Gunnar; Karlsbakk, Egil Erlingsson; Fiksdal, Ingrid Uglenes; Dahle, Maria; Berg-Rolness, Hakon Schau; Mæhle, Stig; Ghebretnsae, Dawit Berhe; Nordbø, Joachim; Patel, Sonal; Madhun, Abdullah Sami; Grove, Søren; Kvamme, Bjørn Olav (Peer reviewed; Journal article, 2023)Piscine orthoreovirus -1 (PRV-1) causes the disease heart and skeletal muscle inflammation (HSMI) in farmed Atlantic salmon, and the virus has been detected in wild anadromous Atlantic salmon and brown trout. However, the ... -
Full compensatory growth before harvest and no impact on fish welfare in Atlantic salmon after an 8-week fasting period
Hvas, Malthe; Nilsson, Jonatan; Vågseth, Tone; Nola, Velimir; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Oppedal, Frode; Stien, Lars Helge; Folkedal, Ole (Peer reviewed; Journal article, 2021)Individually tagged Atlantic salmon postsmolts (≈1200 g, 46 cm) reared in triplicate indoor holding tanks were fasted for 8 weeks at 12 °C and subsequently refed for 5 weeks, whereafter they were transferred to triplicate ... -
Full production cycle performance of gene-edited, sterile Atlantic salmon - growth, smoltification, welfare indicators and fillet composition
Kleppe, Lene; Fjelldal, Per Gunnar; Andersson, Eva; Hansen, Tom Johnny; Sanden, Monica; Bruvik, Aina; Skaftnesmo, Kai Ove; Furmanek, Tomasz; Kjærner-Semb, Erik Nordtorp; Crespo, Diego; Flavell, Simon; Pedersen, Audun Østby; Vogelsang, Petra; Torsvik, Anja; Kvestad, Karen Anita; Olausson, Sara; Norberg, Birgitta; Schulz, Rüdiger W.; Bogerd, J.; Santi, N.; Edvardsen, Rolf Brudvik; Wargelius, Anna (Peer reviewed; Journal article, 2022)Using germ cell-free (GCF), sterile, dnd-knockout salmon for farming could solve the problems associated with precocious maturation and genetic introgression of farmed breeds into wild populations. However, prior to using ... -
Growth Performance, Nutrient Digestibility, and Retention in Atlantic Salmon, Salmo salar L., Fed Diets with Fermented Sugar Kelp, Saccharina latissima
Sartipiyarahmadi, Sahar; Philip, Antony Jesu Prabhu; Sveier, Harald; Steinsund, Silje; Lock, Erik Jan Robert; Madaro, Angelico; Hansen, Tom Johnny; Wiech, Martin; Strand, Øivind; Jakobsen, Jan Vidar; Van Der Heide, Marleen E.; Nørgaard, Jan Værum; Remø, Sofie C. (Peer reviewed; Journal article, 2023)Using low trophic marine resources such as sugar kelp (Saccharina latissimi) is of great interest to increase the circular food production in the ocean. Sugar kelp does, however, contain high levels of carbohydrates and ... -
Impact of Antioxidant Feed and Growth Manipulation on the Redox Regulation of Atlantic Salmon Smolts
Yin, Peng; Bjørnsson, Bjørn Thrandur; Fjelldal, Per Gunnar; Saito, Takaya; Remø, Sofie C.; Edvardsen, Rolf Brudvik; Hansen, Tom Johnny; Sharma, Sandeep; Olsen, Rolf Erik; Hamre, Kristin (Peer reviewed; Journal article, 2022)Accumulating evidence indicates a close relationship between oxidative stress and growth rate in fish. However, the underlying mechanisms of this relationship remain unclear. This study evaluated the combined effect of ... -
In sea trout, the physiological response to salmon louse is stronger in female than in males
Fjelldal, Per Gunnar; Dalvin, Sussie Trine; Ugelvik, Mathias Stølen; Pedersen, Audun Østby; Hansen, Tom Johnny; Skjold, Bjørnar; Dyrhovden, Lise; Kroken, Ann-Kathrin Jakobsen; Karlsen, Ørjan (Peer reviewed; Journal article, 2023)The aims of this study were to compare male and female sea trout (Salmo trutta) with respect to their hypo-osmoregulatory ability over a simulated migration to seawater and their clinical and physiological response to ... -
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.)
Myklatun, Lars Eirik; Fraser, Thomas; Fjelldal, Per Gunnar; Pedersen, Audun Østby; Hansen, Tom Johnny (Peer reviewed; Journal article, 2023)The life history of Atlantic salmon is plastic and determined by factors such as daylength and temperature. In aquaculture, artificial long days during smolt production maximize growth and allows for early sea-transfer, ... -
Loss of stra8 Increases Germ Cell Apoptosis but Is Still Compatible With Sperm Production in Atlantic Salmon (Salmo salar)
Skaftnesmo, Kai Ove; Crespo, Diego; Kleppe, Lene; Andersson, Eva; Edvardsen, Rolf Brudvik; Norberg, Birgitta; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Schulz, Rüdiger W.; Wargelius, Anna (Peer reviewed; Journal article, 2021)Entering meiosis strictly depends on stimulated by retinoic acid 8 (Stra8) gene function in mammals. This gene is missing in a number of fish species, including medaka and zebrafish, but is present in the majority of fishes, ... -
A multiplier peroxiporin signal transduction pathway powers piscine spermatozoa
Chauvigné, Francois; Ducat, Carla; Ferré, Alba; Hansen, Tom Johnny; Carrascal, Montserrat; Abián, Joaquín; Finn, Roderick Nigel; Cerdà, Joan (Peer reviewed; Journal article, 2021)The primary task of a spermatozoon is to deliver its nuclear payload to the egg to form the next-generation zygote. With polyandry repeatedly evolving in the animal kingdom, however, sperm competition has become widespread, ... -
No environmental effect on vaccine-induced reduced growth in Atlantic salmon Salmo salar smolts
Fraser, Thomas; Fjelldal, Per Gunnar; Sommerset, Ingunn; Søfteland, Tina; Høstmark, Ole; Powell, Mark; Heen, Vegar; Hansen, Tom Johnny (Peer reviewed; Journal article, 2020)Oil-adjuvanted vaccines reduce long-term growth in farmed Atlantic salmon Salmo salar, possibly via an increase in metabolic rate due to the energetic demands of the immune system. We tested this hypothesis by comparing ... -
Piscine orthoreovirus (PRV) in red and melanised foci in white muscle of Atlantic salmon (Salmo salar)
Bjørgen, Håvard; Wessel, Øystein; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Sveier, Harald; Sæbø, Håkon Rydland; Enger, Katrine Bones; Monsen, Erik; Kvellestad, Agnar Ståle; Rimstad, Espen; Koppang, Erling Olaf (Journal article; Peer reviewed, 2015) -
Pituitary Gonadotropin Gene Expression During Induced Onset of Postsmolt Maturation in Male Atlantic Salmon: In Vivo and Tissue Culture Studies
Crespo, Diego; Skaftnesmo, Kai Ove; Kjærner-Semb, Erik Nordtorp; Yilmaz, Ozlem; Norberg, Birgitta; Olausson, Sara; Vogelsang, Petra; Bogerd, Jan; Kleppe, Lene; Edvardsen, Rolf Brudvik; Andersson, Eva; Wargelius, Anna; Hansen, Tom Johnny; Fjelldal, Per Gunnar; Schulz, Rüdiger W. (Peer reviewed; Journal article, 2022)Precocious male maturation causes reduced welfare and increased production costs in Atlantic salmon (Salmo salar) aquaculture. The pituitary produces and releases follicle-stimulating hormone (Fsh), the gonadotropin ... -
The Piwil1 N domain is required for germ cell survival in Atlantic salmon
Almeida, Fernanda Loureiro; Skaftnesmo, Kai Ove; Andersson, Eva; Kleppe, Lene; Edvardsen, Rolf Brudvik; Norberg, Birgitta; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Schulz, Rüdiger W.; Wargelius, Anna (Peer reviewed; Journal article, 2022)Genetic introgression of farmed salmon into wild populations can damage the genetic integrity of wild stocks and is therefore considered as an environmental threat. One possible solution is to induce sterility in farmed ... -
Ploidy elicits a whole-genome dosage effect: growth of triploid Atlantic salmon is linked to the genetic origin of the second maternal chromosome set
Harvey, Alison C.; Fjelldal, Per Gunnar; Solberg, Monica Favnebøe; Hansen, Tom Johnny; Glover, Kevin (Peer reviewed; Journal article, 2017) -
Production and verification of the first Atlantic salmon (Salmo salar L.) clonal lines
Hansen, Tom Johnny; Penman, David J.; Glover, Kevin; Fraser, Thomas; Vågseth, Tone; Thorsen, Anders; Sørvik, Anne Grete Eide; Fjelldal, Per Gunnar (Peer reviewed; Journal article, 2020)In several fish species homozygous and heterozygous clonal lines have been produced using gynogenetic and androgenetic techniques. These lines are standardized and can be reproduced over generations. In rainbow trout such ... -
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
Brimsholm, Malin Helen; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Fraser, Thomas; Solberg, Monica Favnebøe; Glover, Kevin Alan; Koppang, Erling Olaf; Bjørgen, Håvard (Peer reviewed; Journal article, 2023)Selective breeding plays a vital role in the production of farmed Atlantic salmon and has shown success in many aspects. Still, challenges related to fish health and welfare continue to result in significant economic losses. ... -
Salmon lice threaten growth, osmoregulation and survival in anadromous Arctic char post-smolts
Fjelldal, Per Gunnar; Hansen, Tom Johnny; Karlsen, Ørjan; Wright, Daniel William (Peer reviewed; Journal article, 2019)High salmon lice (Lepeophtheirus salmonis) infestation levels resulting from intensive salmonid sea-cage aquaculture can threaten populations of wild salmonid hosts. This includes anadromous Arctic char (Salvelinus alpinus), ... -
Seasonal Changes in Photoperiod: Effects on Growth and Redox Signaling Patterns in Atlantic Salmon Postsmolts
Yin, Peng; Saito, Takaya; Fjelldal, Per Gunnar; Björnsson, Björn Thrandur; Remø, Sofie C.; Hansen, Tom Johnny; Sharma, Sandeep; Olsen, Rolf-Erik; Hamre, Kristin (Peer reviewed; Journal article, 2023)Farmed Atlantic salmon reared under natural seasonal changes in sea-cages had an elevated consumption of antioxidants during spring. It is, however, unclear if this response was caused by the increase in day length, ... -
Sexual maturation and smoltification in domesticated Atlantic salmon (Salmo salar L.) - is there a developmental conflict?
Fjelldal, Per Gunnar; Schulz, Rüdiger W.; Nilsen, Tom Ole; Andersson, Eva; Norberg, Birgitta; Hansen, Tom Johnny (Journal article; Peer reviewed, 2018)We present data from two experiments that examined how the developmental processes of smoltification and sexual maturation proceed in parallel in domesticated Atlantic salmon. Onset of maturation and smoltification was ... -
Spawning manipulation, broodfish diet feeding and egg production in farmed Atlantic salmon
Fjelldal, Per Gunnar; Adam, Anne-Catrin; Berge, Gerd Marit; Lein, Ingrid; Hevrøy, Ernst Morten; Næve, Ingun; Seim, Rudi R.; Mommens, Maren; Skjærven, Kaja Helvik; Hansen, Tom Johnny; Hamre, Kristin (Peer reviewed; Journal article, 2024)Atlantic salmon aquaculture relies on continuous supply of high quality eggs. Broodfish nutrition and manipulation of ovulation time (photoperiod and temperature) are key factors. The optimum feeding period with broodfish ...