Wharfies are continuing industrial action against DP World Australia, saying the stevedoring company is refusing to negotiate a resolution to stalled workplace agreement talks.
Maritime Union of Australia members will walk off the job in Fremantle for 24 hours from Saturday morning.
Sydney wharfies did so for 48 hours on Thursday and Friday, while 350 Brisbane wharfies staged a series of one-hour strikes at the start of every shift.
The action follows a series of stoppages that shut DP World container terminals for between 48 and 96 hours last week, involving more than 1800 wharfies in Melbourne, Sydney, Brisbane and Fremantle.
Workers at all four terminals are continuing indefinite bans on overtime, shift extensions and more.
"Rather than bargain, management have basically told workers to withdraw their claims entirely and accept the company's offer or there will be no agreement," MUA assistant national secretary Warren Smith said.
"We simply will not do this."
The company confirmed on Thursday that about 200 wharfies will lose their job at ports in Melbourne and Sydney.
That comes on top of 50 jobs being slashed in Melbourne earlier this week.
"In the absence of significant negotiation progress over the past nine months, the company must push on and address the impact of volume losses," chief operating officer Andrew Adam said.
Australian Associated Press