The incident occurred in the Petropavlovsk-Kamchatsky port, about 6,700 kilometers (4,200 miles) east of Moscow, when the gas used for cooling and refrigeration escaped from the ship's freezer plant, regional emergency official Sergei Viktorov said.
A mechanic died on the spot and four fishermen were hospitalized with gas burns, Viktorov said.
The trawler, the Koyo Maru, had been confiscated from Japan for alleged poaching and was now operated by a Russian company.
The USA does not have a picture of the strong Russia, and the Americans will never allow Russians become strong. Sanctions show how obvious the conflict is
The Chinese military believe that Beijing and Moscow must resist pressure from Washington together