Tom Hansen
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View article: Physiology and morphology of clonal Atlantic salmon—influence of incubation temperature, ploidy, and zygosity
Physiology and morphology of clonal Atlantic salmon—influence of incubation temperature, ploidy, and zygosity Open
Isogenic (clonal) fish lines are useful experimental models to study effects of environment versus genetics on phenotypic traits, as they can be maintained for generations without change, providing advantages over outbred groups prone to g…
View article: B-cell distribution and composition in the gills and the interbranchial lymphoid tissue (ILT) of the Atlantic salmon (<i>Salmo salar</i> L.)
B-cell distribution and composition in the gills and the interbranchial lymphoid tissue (ILT) of the Atlantic salmon (<i>Salmo salar</i> L.) Open
Fish lack organized mucosa-associated lymphoid tissues as found in birds and mammals. However, a distinct aggregation of lymphoid cells, the interbranchial lymphoid tissue (ILT), was identified in the gills of the Atlantic salmon (Salmo sa…
View article: Production of donor-derived Atlantic salmon progeny using allogeneic surrogate broodstock technology
Production of donor-derived Atlantic salmon progeny using allogeneic surrogate broodstock technology Open
International audience
View article: Effect of heterozygosity, ploidy and incubation temperature on post‐cranial axial skeletal meristics and deformities in Atlantic salmon (<i>Salmo salar</i>)
Effect of heterozygosity, ploidy and incubation temperature on post‐cranial axial skeletal meristics and deformities in Atlantic salmon (<i>Salmo salar</i>) Open
The teleostean post‐cranial axial skeleton is a highly specialized structure for an aquatic mode of life. However, there is limited knowledge regarding parental contributions, early‐life environmental impacts on its meristic variation and …
View article: Spring-assisted cranioplasty for children with craniosynostosis
Spring-assisted cranioplasty for children with craniosynostosis Open
Premature closure of the sutures, craniosynostosis, can lead to severe complications when untreated. Spring-assisted cranioplasty has some advantages compared to calvarial vault remodelling e.g. less blood loss and reduced operative time. …
View article: A Review on the Effects of the Doubled Maternal Genome in Triploids With a Suggested Pathway to Improving Their Performance in Aquaculture by Purging Deleterious Genes
A Review on the Effects of the Doubled Maternal Genome in Triploids With a Suggested Pathway to Improving Their Performance in Aquaculture by Purging Deleterious Genes Open
Triploid fish are usually sterile, a trait which reduces unwanted sexual maturation in fish farming and eliminates the risk for negative genetic effects of escapees on wild stocks. The triploid state, normally established through a doublin…
View article: Manipulated Spawning Along With an Extension of the Atlantic Salmon Broodfish Feeding Period Affect the Vitamin C, E, D, and K Status of Broodfish, Eggs, and First‐Feeding Fry
Manipulated Spawning Along With an Extension of the Atlantic Salmon Broodfish Feeding Period Affect the Vitamin C, E, D, and K Status of Broodfish, Eggs, and First‐Feeding Fry Open
The optimum period for feeding a broodfish diet combined with manipulated ovulation time, has recently been investigated for egg production capacity, as well as egg and juvenile quality in Atlantic salmon. Here, we report the status of vit…
View article: Physiological responses in sea trout to repeated salmon louse infections and freshwater
Physiological responses in sea trout to repeated salmon louse infections and freshwater Open
Sea trout (Salmo trutta) migrate to the seawater (SW) for increased food availability. However, heavy infestations with salmon louse (Lepeophtheirus salmonis) can make them return to freshwater (FW). The aim of the present study was to map…
View article: Sequence of formation and inheritance of meristic variation in the post‐cranial axial skeleton of <scp>Atlantic</scp> salmon (<i>Salmo salar</i>)
Sequence of formation and inheritance of meristic variation in the post‐cranial axial skeleton of <span>Atlantic</span> salmon (<i>Salmo salar</i>) Open
Atlantic salmon is an important aquaculture species that has fascinated naturalists for centuries, resulting in its biology being widely characterized. Certain details about the early development and the inheritance of meristic variation i…
View article: A new method for regionalization of the vertebral column in salmonids based on radiographic hallmarks
A new method for regionalization of the vertebral column in salmonids based on radiographic hallmarks Open
Current procedures to establish vertebral column regionalization (e.g., histology) in fish are time consuming and difficult to apply. The aim of this study was to develop a more rapid and accurate radiology‐based method for Atlantic salmon…
View article: Loss of <i>bmp15</i> function in the seasonal spawner Atlantic salmon results in ovulatory failure
Loss of <i>bmp15</i> function in the seasonal spawner Atlantic salmon results in ovulatory failure Open
Bone morphogenetic protein 15 (BMP15) is an oocyte‐specific growth factor important for successful female reproduction in mammals. While mutations in BMP15 / Bmp15 cause ovulatory deficiency and/or infertility in certain mammalian species,…
View article: Vgll3 regulates the timing of puberty in farmed Atlantic salmon, but it does not explain family discordance in male maturation following different smolt production regimes
Vgll3 regulates the timing of puberty in farmed Atlantic salmon, but it does not explain family discordance in male maturation following different smolt production regimes Open
Atlantic salmon (Salmo salar) farming is moving towards extended periods of land-based production to minimise the time at sea, but this increases the risk of unwanted male sexual maturation. As the timing of puberty is driven by genetics (…
View article: Deciphering the pathogenesis of melanized focal changes in the white skeletal muscle of farmed Atlantic salmon (<i>Salmo salar</i>)
Deciphering the pathogenesis of melanized focal changes in the white skeletal muscle of farmed Atlantic salmon (<i>Salmo salar</i>) Open
Melanized focal changes (MFCs) in the fillet of farmed Atlantic salmon is a major quality concern. The changes are thought to initially appear as acute red focal changes (RFCs) that progress into chronic MFCs. Recent findings have indicate…
View article: Organisation of the Atlantic salmon (Salmo salar) thymus and its content of Ig-expressing cells
Organisation of the Atlantic salmon (Salmo salar) thymus and its content of Ig-expressing cells Open
The thymus of fishes is located as a dual organ in a rostrodorsal projection within the gill chamber and is covered by the operculum. The histological organization of the teleost fish thymus displays considerable diversity, particularly in…
View article: Exogenous growth hormone (GH) increases dimension and reduces strength of vertebrae in Atlantic salmon (Salmo salar)
Exogenous growth hormone (GH) increases dimension and reduces strength of vertebrae in Atlantic salmon (Salmo salar) Open
Growth hormone (GH) administration increases bone strength in rats, mainly through alterations of the dimensional proportions of vertebrae. However, similar knowledge is lacking in other clades. In order to pursue this, Atlantic salmon wer…
View article: Chromosomal aberrations and early mortality in a non-mammalian vertebrate: example from triploid-induced Atlantic salmon
Chromosomal aberrations and early mortality in a non-mammalian vertebrate: example from triploid-induced Atlantic salmon Open
In commercial aquaculture, the production of triploid fish is currently the most practical approach to prevent maturation and farm-to-wild introgression following escapes. However, triploids often exhibit poor welfare, and the underlying m…
View article: Comparing physiological responses of acute and chronically stressed diploid and triploid Atlantic salmon (Salmo salar)
Comparing physiological responses of acute and chronically stressed diploid and triploid Atlantic salmon (Salmo salar) Open
We compared the performance and physiological response of diploid and triploid Atlantic salmon (Salmo salar) following 21 days of either unpredictable chronic stress (UCS) or no disturbance (control). Thereafter, all four groups were chall…
View article: Blue mussel (Mytilus edulis) silage, a possible low trophic marine protein source for Atlantic salmon (Salmo salar L.)
Blue mussel (Mytilus edulis) silage, a possible low trophic marine protein source for Atlantic salmon (Salmo salar L.) Open
Blue mussel (Mytilus edulis) could be a promising marine protein source in fish feeds and is of great interest since it can be cultivated along the Norwegian coastline. However, the use of blue mussels in feeds is dependent on developing s…
View article: Loss of Fshr Prevents Testicular Maturation in Atlantic Salmon (<i>Salmo salar</i> L.)
Loss of Fshr Prevents Testicular Maturation in Atlantic Salmon (<i>Salmo salar</i> L.) Open
Early puberty poses a significant challenge for male Atlantic salmon in aquaculture due to its negative impact on growth and welfare. The regulation of puberty in vertebrates involves 2 key reproductive hormones: follicle-stimulating hormo…
View article: Growth Performance, Nutrient Digestibility, and Retention in Atlantic Salmon, Salmo salar L., Fed Diets with Fermented Sugar Kelp, Saccharina latissima
Growth Performance, Nutrient Digestibility, and Retention in Atlantic Salmon, Salmo salar L., Fed Diets with Fermented Sugar Kelp, Saccharina latissima Open
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 iodine and does not…
View article: Trophic ecology and coastal niche partitioning of two sympatric shark species in the Azores (mid-Atlantic)
Trophic ecology and coastal niche partitioning of two sympatric shark species in the Azores (mid-Atlantic) Open
The exploitation of marine resources has caused drastic declines of many large predatory fishes. Amongst these, sharks are of major conservation concern due to their high vulnerability to overfishing and their ecological role as top predat…
View article: Spawning manipulation, broodfish diet feeding and egg production in farmed Atlantic salmon
Spawning manipulation, broodfish diet feeding and egg production in farmed Atlantic salmon Open
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 diet has not been…
View article: The Distribution of IgT mRNA+ Cells in the Gut of the Atlantic Salmon (Salmo salar L.)
The Distribution of IgT mRNA+ Cells in the Gut of the Atlantic Salmon (Salmo salar L.) Open
The newly discovered IgT+ B cell is thought to play a dominant role in mucosal immunity, but limited studies have examined its distribution in fish species, hindering our understanding of its function. This study investigated IgT and poly …