Interesting paper about ice-free rivers, from Alta but is applicable for Surna.
16.05.2021 17:27
Ice-dependent winter survival of juvenile Atlantic Salmon
R. D. Hedger, T. F. Næsje, P. Fiske, O. Ugedal, A. G. Finstad & E. B. Thorsta
Not only ice-free higher temperature burns more fat but also the lack of deep slow winter habitat,