Chamber executive Neil Grose said the groups actions were unacceptable.

"Tasmanian business is already under pressure from the economic effects of the coronavirus without this unnecessary industrial action from the MUA threatening our exports and imports," he said.

He said the union is restricting the movement of containers in Melbourne and Burnie.

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"To unfairly restrict freight movement to further the aims of the Maritime Union will only serve to disadvantage Tasmanian business and those people whose jobs rely on those businesses," said Mr Grose.

Toll workers at Webb Dock in Melbourne are in the midst of renegotiating their enterprise agreement with the company.

Workers in Burnie are not apart of the action because they have a seperate agreement but Mr Grose said it will be Tasmanian workers who are impacted.

"People who work on the waterfront in Melbourne are pretty well paid, it is low paid workers in Tasmania which will lose their jobs," Mr Grose said.

The Tasmanian Chamber of Commerce and Industry and the government have also called on MUA to stop the action.

MUA deputy national secretary Will Tracey said claims Tasmanian shipping is being blockaded are false.

"The fact is union members have undertaken a single 24 hours stoppage, two weeks ago, which was completely legal and protected under the Fair Work Act," he said.

"Since then our members have continued to work their usual 10 hour shifts, five or six days a week, including evening shifts that work through to 11pm."

He said the government and chamber of commerce and industry either had no idea what was going on or were deliberately deceiving Tasmanians.

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