Browsing Brage IMR by Author "Andersson, Eva"
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Dnd knockout ablates germ cells and demonstrates germ cell independent sex differentiation in Atlantic salmon
Wargelius, Anna; Leininger, Sven Dirk; Skaftnesmo, Kai Ove; Kleppe, Lene; Andersson, Eva; Taranger, Geir Lasse; Schulz, Rüdiger W.; Edvardsen, Rolf (Journal article; Peer reviewed, 2016-02-18)Introgression of farmed salmon escapees into wild stocks is a major threat to the genetic integrity of wild populations. Using germ cell-free fish in aquaculture may mitigate this problem. Our study investigated whether ... -
Effects of dietary arachidonic acid on the reproductive physiology of female Atlantic cod (Gadus morhua L.)
Norberg, Birgitta; Kleppe, Lene; Andersson, Eva; Thorsen, Anders; Rosenlund, Grethe; Hamre, Kristin (Peer reviewed; Journal article, 2017) -
Effects of dietary arachidonic acid on the reproductive physiology of female Atlantic cod (Gadus morhua L.)
Norberg, Birgitta; Kleppe, Lene; Andersson, Eva; Thorsen, Anders; Rosenlund, Grethe; Hamre, Kristin (Peer reviewed; Journal article, 2017) -
Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar)
Schulz, Rüdiger W.; Taranger, Geir Lasse; Bogerd, Jan; Nijenhuis, Wouter; Norberg, Birgitta; Male, Rune; Andersson, Eva (Journal article; Peer reviewed, 2019)Background Puberty in male Atlantic salmon in aquaculture can start as early as after the first winter in seawater, stunts growth and entails welfare problems due to the maturation-associated loss of osmoregulation capacity ... -
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 ... -
Gnrh receptor gnrhr2bbα is expressed exclusively in lhb-expressing cells in Atlantic salmon male parr
Ciani, Elia; Fontaine, Romain; Maugars, Gersende Marie Aimee; Rasoul, Nourizadeh-Lillabadi; Andersson, Eva; Bogerd, Jan; von Krogh, Kristine; Weltzien, Finn-Arne (Peer reviewed; Journal article, 2020)Gonadotropin-releasing hormone (Gnrh) plays a major role in the regulation of physiological and behavioural processes related to reproduction. In the pituitary, it stimulates gonadotropin synthesis and release via activation ... -
Integrative testis transcriptome analysis reveals differentially expressed miRNAs and their mRNA targets during early puberty in Atlantic salmon
Skaftnesmo, Kai Ove; Edvardsen, Rolf; Furmanek, Tomasz; Crespo, D.; Andersson, Eva; Kleppe, Lene; Taranger, Geir Lasse; Bogerd, Jan; Schulz, Rüdiger W.; Wargelius, Anna (Peer reviewed; Journal article, 2017) -
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, ... -
Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation
Andersson, Eva; Denker, Elsa; Norberg, Birgitta; Schulz, Rüdiger W.; Olausson, Sara; Thorsen, Anders; Stefansson, Sigurd Olav; Imsland, Albert (Peer reviewed; Journal article, 2022)Lumpfish is the most important cleanerfish species in Atlantic salmon farming. Detailed information on the gonadal maturation process is a prerequisite for year-round production of juvenile lumpfish. In the present study ... -
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 ... -
The reproductive cycle of female Ballan wrasse Labrus bergylta in high latitude, temperate waters
Muncaster, S.; Andersson, Eva; Kjesbu, Olav Sigurd; Taranger, Geir Lasse; Skiftesvik, Anne Berit; Norberg, Birgitta (Journal article; Peer reviewed, 2010-08)This 2 year study examined the reproductive cycle of wild female Ballan wrasse Labrus bergylta in western Norway as a precursor to captive breeding trials. Light microscopy of ovarian histology was used to stage gonad ... -
Sex differentiation in Atlantic cod (Gadus morhua L.): morphological and gene expression studies
Haugen, Trine; Almeida, Fernanda F. L.; Andersson, Eva; Bogerd, Jan; Male, Rune; Skaar, Katrine S.; Schulz, Rüdiger W.; Sørhus, Elin; Wijgerde, Tim; Taranger, Geir Lasse (Journal article; Peer reviewed, 2012-06-18)Background In differentiated gonochoristic species, a bipotential gonad develops into an ovary or testis during sex differentiation. Knowledge about this process is necessary to improve methods for masculinizing genetically ... -
Sex steroid production associated with puberty is absent in germ cellfree salmon
Kleppe, Lene; Andersson, Eva; Skaftnesmo, Kai Ove; Edvardsen, Rolf; Fjelldal, Per Gunnar; Norberg, Birgitta; Bogerd, Jan; Schulz, Rüdiger W.; Wargelius, Anna (Peer reviewed; Journal article, 2017) -
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 ... -
Supplementary materials for Loss of Fshr prevents testicular maturation in Atlantic salmon (Salmo salar L.).
Andersson, Eva; Schulz, Rüdiger W; Almeida, Fernanda; Kleppe, Lene; Skaftesmo, Kai Ove; Kjærner-Semb, Erik; Crespo, Diego; Fjelldal, Per Gunnar; Hansen, Tom; Norberg, Birgitta; Edvardsen, Rolf B.; Wargelius, Anna (Others, 2024-01-30)Supplementary materials for "Loss of Fshr prevents testicular maturation in Atlantic salmon (Salmo salar L.)." published in Endocrinology, an Oxford academic journal https://doi.org/10.1210/endocr/bqae013 -
The influence of vgll3 genotypes on sea age at maturity is altered in farmed mowi strain Atlantic salmon
Ayllon, Fernando; Solberg, Monica Favnebøe; Glover, Kevin; Mohammadi, Faezeh; Kjærner-Semb, Erik Nordtorp; Fjelldal, Per Gunnar; Andersson, Eva; Hansen, Tom Johnny; Edvardsen, Rolf; Wargelius, Anna (Journal article; Peer reviewed, 2019)Background: In Atlantic salmon in the wild, age at maturity is strongly influenced by the vgll3 locus. Under farming conditions, light, temperature and feeding regimes are known significantly advance or delay age at ... -
The initiation of puberty in Atlantic salmon brings about large changes in testicular gene expression that are modulated by the energy status
Crespo, Diego; Bogerd, Jan; Sambroni, Elisabeth; LeGac, Florence; Andersson, Eva; Edvardsen, Rolf; Bergman, Elisabeth Jonsson; Björnsson, Björn Thrandur; Taranger, Geir Lasse; Schulz, Rüdiger W. (Journal article; Peer reviewed, 2019)Background When puberty starts before males reach harvest size, animal welfare and sustainability issues occur in Atlantic salmon (Salmo salar) aquaculture. Hallmarks of male puberty are an increased proliferation activity ... -
The use of photoperiods to provide year round spawning in lumpfish Cyclopterus lumpus
Imsland, Albert; Hangstad, Thor Arne; Jonassen, Thor Magne; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Hovgaard, Peter; Elvegård, Tor Anders; Lindberg, Ken Ståle; Mikalsen, Bjørn; Urskog, Tonje Cecilie; Norberg, Birgitta; Andersson, Eva; Spetland, Frank; Reynolds, Patrick (Journal article; Peer reviewed, 2019)In order to provide year round spawning broodstock, lumpfish (initial size 746 g and 24.9 cm) were reared under four different photoperiod regimes from January 2017 to July 2018. One group was reared under simulated natural ... -
Transcriptomic analysis of dead end knockout testis reveals germ cell and gonadal somatic factors in Atlantic salmon
Kleppe, Lene; Edvardsen, Rolf Brudvik; Furmanek, Tomasz; Andersson, Eva; Skaftnesmo, Kai Ove; Thyri Segafredo, Frida; Wargelius, Anna Sofie Troedsson (Peer reviewed; Journal article, 2020)Sustainability challenges are currently hampering an increase in salmon production. Using sterile salmon can solve problems with precocious puberty and genetic introgression from farmed escapees to wild populations. Recently ...