Robinson Hordoir¹, Vahidreza Jahanmard², Pål Erik Isachsen³, Anne-Britt Sandø¹, Ulrike Löptien⁴, Heiner Dietze⁵ and Vidar Lien⁶, (1)Institute of Marine Research, Bergen, Norway, (2)Tallinn University of Technology, Tallinn, Estonia, (3)University of Oslo, Oslo, Norway, (4)University of Kiel (CAU), Kiel, Germany, (5)University of Kiel, Kiel, Germany, (6)Institute of Marine Research Bergen, Oceanography and Climate, Bergen, Norway