STRIKING Fremantle Port workers are back on the job after a 48-hour strike that started on Sunday.

The stoppage was over demands for an 18% pay rise over three years.

The Australian Maritime Officers Union WA told the Port of Fremantle on Tuesday afternoon that a group of its members, pilot boat operators and vessel traffic service officers would stop work.

The workers are demanding three annual pay rises of six per cent, to bring Fremantle into line with other regional WA port pay rates.

A statement from Fremantle Ports said it had received notice that vessel traffic service officers and small craft personnel covered by the Marine Services Enterprise Agreement intend to take 48 hours protected industrial action from Sunday August 18.

While some vessel movements were affected during the stoppage, there are around 17 ship movements scheduled for today, Tuesday, 20 August.