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Ragnhild Valen's picture
  • E-mailRagnhild.Valen@uib.no
  • Phone+47 922 20 149
  • Visitor Address
    Thormøhlens gt. 55
  • Postal Address
    Postboks 7800
    5020 Bergen

Current research focuses on the evolution of cells and molecules involved in regulating the balance between nutrient availability, growth and reproduction (energy homeostasis), using the cnidarian sea anemone Nematostella vectensis as a model organism.

Earlier work includes development and transformation of the visual system in Atlantic cod, and also studies of neuropeptides/gastrointestinal peptides involved in the regulation of digestion and appetite in Atlantic salmon.

BIO111 - Zoology (lab assistant)

BIO114 - Zoophysiology (lab teacher)

BIO101 - Organsimal biology 1 (lab teacher)

Journal articles
  • Eilertsen, Mariann; Valen, Ragnhild; Drivenes, Øyvind; Ebbesson, Lars O.E.; Helvik, Jon Vidar. 2018. Transient photoreception in the hindbrain is permissive to the life history transition of hatching in Atlantic halibut. Developmental Biology. 444: 129-138. doi: 10.1016/j.ydbio.2018.10.006
  • Valen, Ragnhild; Karlsen, Rita; Helvik, Jon Vidar. 2018. Environmental, population and life-stage plasticity in the visual system of Atlantic cod. Journal of Experimental Biology. 221: 1-13. doi: 10.1242/jeb.165191
  • Valen, Ragnhild; Eilertsen, Mariann; Edvardsen, Rolf; Furmanek, Tomasz; Rønnestad, Ivar; van der Meeren, Terje; Karlsen, Ørjan; Nilsen, Tom Ole; Helvik, Jon Vidar. 2016. The two-step development of a duplex retina involves distinct events of cone and rod neurogenesis and differentiation. Developmental Biology. 416: 389-401. doi: 10.1016/j.ydbio.2016.06.041
  • Nilsen, Tom Ole; Lukas, Juliane; Valen, Ragnhild; Helvik, Jon Vidar; Ebbesson, Lars O.E.; Rønnestad, Ivar; Hamre, Kristin; Handeland, Sigurd O; Stefansson, Sigurd Olav. 2015. Utvikling av osmoreguleringssystemet hos torskelarver startfôret på rotatorier eller naturlig zooplankton. Norsk Fiskeoppdrett. E1: 36-38.
  • Valen, Ragnhild; Edvardsen, Rolf; Søviknes, Anne Mette; Drivenes, Øyvind; Helvik, Jon Vidar. 2014. Molecular evidence that only two opsin subfamilies, the blue light- (SWS2) and green light-sensitive (RH2), drive color vision in Atlantic cod (Gadus morhua). PLOS ONE. 9:e0115436. doi: 10.1371/journal.pone.0115436
  • Valen, Ragnhild; Jordal, Ann-Elise Olderbakk; Murashita, Koji; Rønnestad, Ivar. 2011. Postprandial effects on appetite-related neuropeptide expression in the brain of Atlantic salmon, Salmo salar. General and Comparative Endocrinology. 171: 359-366. doi: 10.1016/j.ygcen.2011.02.027
  • Valen, Ragnhild; Jordal, Ann-Elise Olderbakk; Rønnestad, Ivar. 2011. Forskning på overvekt og spiseforstyrrelser hos mennesker kan bidra til å forstå regulering av apetitt hos Atlantisk laks- og vise versa! Norsk Fiskeoppdrett. 3. 56-59.
Reports and theses
  • Valen, Ragnhild. 2016. Visual photoreception in Atlantic cod (Gadus morhua) – Genomic restrictions, neurogenesis and life history transformation. University of Bergen.

More information in national current research information system (CRIStin)

Valen, R., A-E. O. Jordal, K. Murashita and  I. Rønnestad. 2011. Postprandial effects on appetite related neuropeptides expression in the brain of Atlantic salmon, Salmo salar. - General and Comparative Endocrinology. 171(3): 359-366.

Valen, R., A-E. Olderbakk Jordal og I. Rønnestad. 2011 Research on obesity and eating disorders in humans can assist in understanding regulation of appetite in Atlantic salmon- and vice cersa! Norsk Fiskeoppdrett (3). Pp 56-59 (in Norwegian)

Rønnestad, I., Valen, R., Murashita, K., Jordal, A.-E. O., 2010. Postprandial changes in GI-tract peptide hormones in the teleost Atlantic salmon. FASEB Joournal. 24, lb620-.

Master of Science (MSc) in Cell and developmental biology (2009)

NFR. CODE- a national knowledge platform for the early stages of Atlantic cod. (#199482) 2010-13.

NFR: BIOplus. Innovative use of bioactive marine ingredients as strategy to sustain growth in fish farming prod. and to improve fish flesh quality. (contracted partner w NOFIMA; Grant # 190043). 2009-12