Browsing Articles by Author "Schulz, Rüdiger W."
Now showing items 1-19 of 19
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Atlantic salmon male post-smolt maturation can be reduced by using a 3-hour scotophase when inducing smoltification
Fraser, Thomas; Hansen, Tom Johnny; Norberg, Birgitta; Nilsen, Tom Ole; Schulz, Rüdiger W.; Fjelldal, Per Gunnar (Peer reviewed; Journal article, 2023)Photoperiod regulates the occurrence of unwanted male post-smolt maturation during the production of large (>100 g) Atlantic salmon (Salmo salar) smolts. However, the optimal daylength for triggering smoltification, but ... -
Development of supermale and all-male Atlantic salmon to research the vgll3 allele - puberty link
Fjelldal, Per Gunnar; Hansen, Tom Johnny; Wargelius, Anna; Ayllon, Fernando; Glover, Kevin Alan; Schulz, Rüdiger W.; Fraser, Thomas (Peer reviewed; Journal article, 2020)Farmed Atlantic salmon are one of the most economically significant global aquaculture products. Early sexual maturation of farmed males represents a significant challenge to this industry and has been linked with the vgll3 ... -
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 ... -
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 ... -
Follicle-Stimulating Hormone Regulates igfbp Gene Expression Directly or via Downstream Effectors to Modulate Igf3 Effects on Zebrafish Spermatogenesis
Safian, Diego; Kant, Henk J. G. van der; Crespo, Diego; Bogerd, Jan; Schulz, Rüdiger W. (Peer reviewed; Journal article, 2017) -
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 ... -
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 ... -
Rescue of germ cells in dnd crispant embryos opens the possibility to produce inherited sterility in Atlantic salmon
Guralp, Hilal; Skaftnesmo, Kai Ove; Kjærner-Semb, Erik Nordtorp; Straume, Anne Hege; Kleppe, Lene; Schulz, Rüdiger W.; Edvardsen, Rolf Brudvik; Wargelius, Anna (Peer reviewed; Journal article, 2020)Genetic introgression of escaped farmed Atlantic salmon (Salmo salar) into wild populations is a major environmental concern for the salmon aquaculture industry. Using sterile fish in commercial aquaculture operations is, ... -
Role of the Melanocortin System in Gonadal Steroidogenesis of Zebrafish
Navarro, Sandra; Crespo, Diego; Schulz, Rüdiger W.; Ge, Wei; Rotllant, Josep; Cerdá-Reverter, José Miguel; Rocha, Ana (Peer reviewed; Journal article, 2022)In teleost, as in other vertebrates, stress affects reproduction. A key component of the stress response is the pituitary secretion of the adrenocorticotropic hormone (ACTH), which binds to the melanocortin 2 receptor ... -
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 ... -
Spermatogonial Stem Cell Niche and Spermatogonial Stem Cell Transplantation in Zebrafish
Nóbrega, Rafael Henrique; Greebe, Caaj Douwe; van de Kant, Henk; Bogerd, Jan; de França, Luiz Renato; Schulz, Rüdiger W. (Journal article; Peer reviewed, 2010-09-20)Background Spermatogonial stem cells (SSCs) are the foundation of spermatogenesis, and reside within a specific microenvironment in the testes called “niche” which regulates stem cell properties, such as, self-renewal, ... -
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 ... -
Vgll3 and the Hippo pathway are regulated in Sertoli cells upon entry and during puberty in Atlantic salmon testis
Kjærner-Semb, Erik Nordtorp; Ayllon, Fernando; Kleppe, Lene; Sørhus, Elin; Skaftnesmo, Kai Ove; Furmanek, Tomasz; Segafredo, Frida Thyri; Thorsen, Anders; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Taranger, Geir Lasse; Andersson, Eva; Schulz, Rüdiger W.; Wargelius, Anna; Edvardsen, Rolf (Journal article; Peer reviewed, 2018)Vgll3 is linked to age at maturity in Atlantic salmon (Salmo salar). However, the molecular mechanisms involving Vgll3 in controlling timing of puberty as well as relevant tissue and cell types are currently unknown. Vgll3 ...