• Growth of wild and domesticated Atlantic cod Gadus morhua reared under semi-commercial conditions 

      Otterå, Håkon Magne; Heino, Mikko; Sørvik, Anne Grete Eide; Svåsand, Terje; Karlsen, Ørjan; Thorsen, Anders; Glover, Kevin (Journal article; Peer reviewed, 2018)
      Genetic interactions between farmed escapees and wild fish represent a challenge to environmentally sustainable aquaculture. Breeding programs for Atlantic cod Gadus morhua have been initiated; however, the genetic response ...
    • Half a century of high-latitude fisheries oceanography research on the "recruitment problem" in Northeast Arctic cod (Gadus morhua) 

      Kjesbu, Olav Sigurd; Tiedemann, Maik; Alix, Maud; Thorsen, Anders; Sundby, Svein (Peer reviewed; Journal article, 2023)
      Predicting recruitment in a reliable fashion is a great challenge within operational fisheries advice. Here, we consulted the unique but undercommunicated IMR Cod Larva Project (1975–1990), its spin-offs, placed in an ...
    • How variable is the fecundity within and between cod stocks? 

      Lambert, Yvan; Kjesbu, Olav Sigurd; Kraus, G.; Marteinsdottir, Gudrun; Thorsen, Anders (ICES CM documents, Working paper, 2005)
      Stock reproductive potential is determined by the number of fish at age, sex ratio, proportion of mature female at age and fecundity. Fecundity data, which are fundamental in estimating egg production are not collected ...
    • Judging a salmon by its spots: Environmental variation is the primary determinant of spot patterns in Salmo salar 

      Jørgensen, Katarina Mariann; Solberg, Monica Favnebøe; Besnier, Francois; Thorsen, Anders; Fjelldal, Per Gunnar; Skaala, Øystein; Malde, Ketil; Glover, Kevin (Journal article; Peer reviewed, 2018)
      In fish, morphological colour changes occur from variations in pigment concentrations and in the morphology, density, and distribution of chromatophores in the skin. However, the underlying mechanisms remain unresolved in ...
    • Latitudinally distinct stocks of Atlantic cod face fundamentally different biophysical challenges under on-going climate change 

      Kjesbu, Olav Sigurd; Alix, Maud; Sandø, Anne Britt; Strand, Espen; Wright, Peter J.; Johns, David G.; Thorsen, Anders; Marshall, C. Tara; Bakkeplass, Kjell Gunnar; Vikebø, Frode Bendiksen; Myksvoll, Mari Skuggedal; Ottersen, Geir; Allan, Bridie Jean Marie; Fossheim, Maria; Stiansen, Jan Erik; Huse, Geir; Sundby, Svein (Peer reviewed; Journal article, 2023)
      The reproductive success of marine ectotherms is especially vulnerable in warming oceans due to alterations in adult physiology, as well as embryonic and larval survival prospects. These vital responses may, however, differ ...
    • Latitudinally distinct stocks of Atlantic cod face fundamentally different biophysical challenges under on-going climate change 

      Kjesbu, Olav Sigurd; Alix, Maud; Sandø, Anne Britt; Strand, Espen; Wright, Peter J.; Johns, David G.; Thorsen, Anders; Marshall, C. Tara; Bakkeplass, Kjell Gunnar; Vikebø, Frode Bendiksen; Myksvoll, Mari Skuggedal; Ottersen, Geir; Allan, Bridie Jean Marie; Fossheim, Maria; Stiansen, Jan Erik; Huse, Geir; Sundby, Svein (Peer reviewed; Journal article, 2023)
      The reproductive success of marine ectotherms is especially vulnerable in warming oceans due to alterations in adult physiology, as well as embryonic and larval survival prospects. These vital responses may, however, differ ...
    • Liver energy, atresia and oocyte stage influence fecundity regulation in Northeast Arctic cod 

      Skjæraasen, Jon Egil; Nash, Richard D.M.; Kennedy, James; Thorsen, Anders; Nilsen, Trygve; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2010-04-08)
      Marine ecosystems are changing; global warming-induced increases in water temperatures and fishing have caused truncated age structures and small sizes at maturity in many stocks. This may affect both populations’ total ...
    • 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 ...
    • Mapping of fish spawning in the North Sea — Report of the KINO-2 project for 2018 

      Mateos-Rivera, Alejandro; Mozfar, Bahar; Skern-Mauritzen, Rasmus; Dahle, Geir; Wehde, Henning; Kleppe, Lisbeth; Sundby, Svein; Thorsen, Anders; Seliussen, Bjørghild Breistein; Asplin, Lars; Aguirre, Gaston Ezequiel; Isari, Stamatina; Krafft, Bjørn Arne (Rapport fra havforskningen, Research report, 2019)
      Increased and updated knowledge of reproductive strategies of fish is crucial to optimize the temporal and spatial planning for conducting seismic surveys; in order to reduce its potential negative ecosystems impacts. The ...
    • Mapping of Fish Spawning in the North Sea; Report of the “KINO-2” Project for 2019 

      Mateos-Rivera, Alejandro; Mozfar, Bahar; Skern, Rasmus; Dahle, Geir; Wehde, Henning; Kleppe, Lisbeth; Sundby, Svein; Thorsen, Anders; Asplin, Lars; Isari, Stamatina; Krafft, Bjørn Arne (Rapport fra havforskningen;2020 - 2, Research report, 2020)
      Increased and updated knowledge of reproductive strategies of fish is crucial to optimize the temporal and spatial planning for conducting seismic surveys; in order to reduce its potential negative ecosystems impacts. The ...
    • Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) 

      Skjæraasen, Jon Egil; Kennedy, James; Thorsen, Anders; Fonn, Merete; Strand, Bente; Mayer, Ian; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2009-09)
      To examine mechanisms that affect fecundity, atresia and skipped spawning in Northeast Arctic cod (Gadus morhua L.), we conducted an experiment where wild-caught cod (>60 cm) kept under restricted food regimes were subjected ...
    • Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) 

      Skjæraasen, Jon Egil; Kennedy, James; Thorsen, Anders; Fonn, Merete; Strand, Bente; Mayer, Ian; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2009-09)
      To examine mechanisms that affect fecundity, atresia and skipped spawning in Northeast Arctic cod (Gadus morhua L.), we conducted an experiment where wild-caught cod (>60 cm) kept under restricted food regimes were subjected ...
    • New insights in oocyte dynamics shed light on the complexities associated with fish reproductive strategies 

      Serrat, Alba; Saborido-Rey, Fran; Garcia-Fernandez, Cristina; Muñoz, Marta; Lloret, Josep; Thorsen, Anders; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2019)
      Information on temporal variations in stock reproductive potential (SRP) is essential in fisheries management. Despite this relevance, fundamental understanding of egg production variability remains largely unclear due to ...
    • Ontogeny-Specific Skeletal Deformities in Atlantic Haddock Caused by Larval Oil Exposure 

      Olsvik, Pål Asgeir; Sørhus, Elin; Meier, Sonnich; Torvanger, Ingrid; Thorbjørnsen, Maja; Thorsen, Anders; Sørensen, Lisbet; Fjelldal, Per Gunnar; Karlsen, Ørjan; Guimaraes, Igo G.; Lie, Kai Kristoffer (Peer reviewed; Journal article, 2021)
      Bone deformities are one of the main effects of crude oil exposure in marine fish larvae. Craniofacial and jaw deformities, if severe enough, may restrict feeding and ultimately kill the developing larvae. This study aimed ...
    • Overview of the EU fair project "STEREO" (Stock effects on recruitment relationships) 

      MacKenzie, Brian; Heath, Michael; Ådlandsvik, Bjørn; Backhaus, Jan O.; Bogstad, Bjarte; Gallego, Alejandro; Godø, Olav Rune; Gudmundsdottir, Asta; Harms, Ingo H.; Heilmann, J.P.; Jonsson, Sigurður; Kjesbu, Olav Sigurd; MacKenzie, Eddie; Marteinsdottir, Gudrun; Nielsen, Einar E.; Scott, Beth; Strugnell, G.; Stefánsson, Gunnar; Thorsen, Anders; Visser, Andre W.; Wright, Peter (ICES CM Documents;1999/Y:10, Working paper, 1999)
      The overall objective of the STEREO project is to improve the methodology for determining limit reference points for the biomass of exploited fish stocks. Limit reference points set boundaries which are intended to ...
    • Poleward spawning of Atlantic mackerel (Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints 

      dos Santos Schmidt, Thassya Christina; Slotte, Aril; Olafsdottir, Anna H.; Nøttestad, Leif; Jansen, Teunis; Jacobsen, Jan Arge; Bjarnason, Sigurvin; Lusseau, Susan Mærsk; Ono, Kotaro; Hølleland, Sondre Nedreås; Thorsen, Anders; Sandø, Anne Britt; Kjesbu, Olav Sigurd (Peer reviewed; Journal article, 2023)
      The Northeast Atlantic mackerel is an income breeder with indeterminate fecundity, spawning in multiple batches at optimal temperatures around 11°C in the upper water column during February–July along the continental shelf ...
    • The potential importance of the paternal contribution to the ‘Stock Reproductive Potential’ of North-East Arctic cod (Gadus morhua) 

      Nash, Richard D.M.; Kjesbu, Olav Sigurd; Thorsen, Anders; Fonn, Merete; Krüger-Johnsen, Maria; Trippel, Ed (ICES CM documents, Working paper, 2005)
      Over the years there has been a growing interest in determining the real stock reproductive potential (SRP) as a means of understanding the dynamics of a fish population. For the purposes of assessment the spawning stock ...
    • Prey-specific gastric evacuation of Norwegian spring spawning herring (Clupea harengus) 

      Broms, Cecilie; Melle, Webjørn; Thorsen, Anders (ICES CM Documents;2004/P:39, Working paper, 2004)
      Gastric evacuation rates have earlier mainly been measured based on laboratory experiments. The aim of this study is to obtain information of gastric evacuation rates when the herring are feeding in their natural environment. ...
    • 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 ...
    • Size of spawning Arcto-Norwegian cod (Gadus morhua L.) and the effects on their eggs and early larvae 

      Solemdal, Per; Bergh, Øivind; Dahle, Geir; Falk-Petersen, Inger-Britt; Fyhn, Hans Jørgen; Grahl-Nielsen, Otto; Haaland, J.M.; Kjesbu, Olav Sigurd; Løken, Sissel; Opstad, Ingegjerd; Pedersen, Torstein; Skiftesvik, Anne Berit; Thorsen, Anders (ICES CM Documents;1993/G:41, Working paper, 1993)
      Using a new method for determining the stage of spawning in batch spawners, a positive correlation between the length of Arcto-Norwegian cod females, having spawned 25-75% of their eggs, and the egg diameter was established. ...