Containership fires were the hottest topic of discussion at the International Union of Marine ­Insurance (IUMI) annual gathering in Toronto.

With major cargo-related fires occurring at a rate of around once every month this year, according to IUMI cargo committee head Sean Dalton, it is probably the ­marine insurance industry’s biggest concern.

IUMI’s figures suggest the largest class of containerships — those over 50,000 gt or in excess of 10,000 teu — has seen the biggest increase in the number of incidents, heightening losses for ­insurers.