During 4 June-2 July 2004, the Norwegian R/V G.O. Sars conducted a multi-disciplinary survey along mid-Atlantic Ridge (MAR) from Reykjanes to north of Azores. This provided first systematic information on MAR cetacean populations. Using naked eye or 7350 hand-held binoculars, observers searched in 140° arc centred ships’ heading. Eleven species and 10 other taxonomic groups were identified 2,32...