Tobias Backström

• Fossen, Inge; Backström, Tobias; Holte, Tomas & Klakegg, Øystein (2025). UV-B light stimulates the production of Vitamin D3 in Atlantic salmon. Aquaculture. ISSN 0044-8486. 611(2026). doi: 10.1016/j.aquaculture.2025.743058. Fulltekst i vitenarkiv Vis sammendrag

  Vitamin D3 was analysed in fish muscle during two separate production trials with Atlantic salmon in the freshwater phase. Each trial consisted of two groups exposed to UV-B light and two control groups. Fish were sampled at the start of the trial and after approximately 30 and 70 days. The groups exposed to UV-B light had 2,5 to 6 times higher Vitamin D3 in the muscle after 4 weeks and more than 5 times as much after about 10 weeks than the control groups. The study suggests that Atlantic salmon in the freshwater phase synthesize pre-vitamin D3 from 7-dehydrocholesterol using UV-B light in a larger extent than previously thought. In today's salmon farming, where more of the farming occurs in closed and submerged facilities with no or limited access to UV-B from natural sunlight, this knowledge is important.

• Vindas, Marco Antonio; Magnhagen, Carin; Brännäs, Eva; Øverli, Øyvind; Winberg, Svante & Nilsson, Jan [Vis alle 7 forfattere av denne artikkelen] (2017). Brain cortisol receptor expression differs in Arctic charr displaying opposite coping styles. Physiology and Behavior. ISSN 0031-9384. 177, s. 161–168. doi: 10.1016/j.physbeh.2017.04.024. Fulltekst i vitenarkiv
• Brännäs, Eva; Backström, Tobias; Nilsson, Jan Erik; Carlberg, Hanna; Stien, Lars Helge & Magnhagen, Carin (2016). Distinguishing Arctic charr with different stress coping styles by visual screening of spottiness ? reliability and consistency over time. Journal of Zoology. ISSN 0952-8369. 300(3), s. 213–220. doi: 10.1111/jzo.12374. Fulltekst i vitenarkiv
• Døving, Kjell Bjarne; Hansson, Kenth-Arne; Backström, Tobias & Hamdani, El Hassan (2011). Visualizing a set of olfactory sensory neurons responding to a bile salt. Journal of Experimental Biology. ISSN 0022-0949. 214(1), s. 80–87. doi: 10.1242/jeb.046607. Fulltekst i vitenarkiv
• Backström, Tobias; Schjolden, Joachim; Øverli, Øyvind; Thörnqvist, Per-Ove & Winberg, Svante (2011). Stress effects on AVT and CRF systems in two strains of rainbow trout (Oncorhynchus mykiss) divergent in stress responsiveness. Hormones and Behavior. ISSN 0018-506X. 59(1), s. 180–186. doi: 10.1016/j.yhbeh.2010.11.008. Fulltekst i vitenarkiv
• Backström, Tobias & Winberg, Svante (2009). Arginine–vasotocin influence on aggressive behavior and dominance in rainbow trout. Physiology and Behavior. ISSN 0031-9384. 96(3), s. 470–475. doi: 10.1016/j.physbeh.2008.11.013. Fulltekst i vitenarkiv Vis sammendrag

  The mammalian neuropeptide arginine–vasopressin (AVP) and its non-mammalian homologue arginine–vasotocin (AVT) are involved in social behavior including aggression in vertebrates. Juvenile rainbow trout (Onchorhynchus mykiss) are highly territorial and we tested the effect of two different doses each of AVT and Manning compound, an AVP V1A receptor antagonist, on aggressive behavior and the outcome of staged fights for social dominance in size matched pairs. Each pair consisted of one fish receiving AVT or Manning compound through an intracerebroventricular (icv) injection and one fish receiving a similar icv injection of saline. In addition, plasma cortisol and brain serotonergic activity were monitored. Fish receiving AVT at a dose of 200 ng became subordinate whereas AVT at a dose of 20 ng had no effect on the outcome of fights for social dominance. Further, Manning compound had no effect on the outcome of fights for dominance but at a dose of 200 ng it had an effect on fight duration. Fish receiving 200 ng Manning compound and losing dyadic fights appeared to take longer to become subordinate. Neither AVT nor Manning compound had any effects on plasma cortisol levels or brainstem serotonergic activity. The apparent inhibiting effect of AVT on aggression could be centrally mediated.

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