Cruise majors are looking to marine gasoil (MGO), high-sulphur fuel oil (HSFO) with scrubbers and LNG to meet the IMO's 0.5% bunker sulphur limit coming into force.

Arnold Donald-led Carnival Corp, the world's largest player, with 106 ships across nine brands, has scrubbers on about two-thirds of its fleet and aims to have them on 85% by 1 January 2020.