Brittany Ferries is warning that meeting new emissions rules could push up ticket prices and threaten jobs.
The company runs services from Plymouth to France and Spain. It has to reduce sulphur in fuel by next year.
But the company says it would like an additional two years because it can't adapt to ships' engines in time. Using low-sulphur fuels will increase fuel costs by 40%
Brittany Ferries have cancelled sailings tomorrow and Monday between Plymouth and Roscoff because of the weather warning.
Tomorrow's sailing between Plymouth and Santander is also cancelled.
Condor Ferries have cancelled services between Weymouth and the Channel Islands tomorrow also because of the weather forecast.
The Scillonian will leave St Mary's early this afternoon (Sat) and is service has been cancelled altogether on Monday due to the expected adverse weather conditions.
The first original Kerisnel ferry to launch was a freight-only service. John Doyle reports 40 years ago. This footage is courtesy of South West Film and Television Archive.
There's relief on both sides of the Channel tonight, and especially in Plymouth, after Brittany ferries resumed their crossings. An industrial dispute, lasting ten days, brought services between Plymouth and Europe, to a halt.
It's thought to have cost local businesses up to twenty million pounds. Our Plymouth Correspondent Jonathan Gibson was at Millbay Docks last night, talking to those caught up in the chaos.
Brittany Ferries sail back into Plymouth after an industrial dispute, lasting ten days, had brought services between Plymouth and Europe, to a halt.
With the Brittany Ferries strike now over, the first ship from Roscoff will arrive in Plymouth later today.
The dispute lasted for twelve days. It affected thousands of passengers and hauliers who would have used the route to get to and from the continent.
Workers agreed a deal with bosses late on Sunday night.
Our Business Correspondent Seth Conway interviewed Richard Price from Brittany Ferries live on The West Country Tonight:
The dispute at Brittany Ferries is over. Workers agreed a deal late last night which will see ferries resuming between Plymouth and France tomorrow.
It brings to an end an argument that began twelve days ago. It's affected thousands of passengers and hauliers who would have used the route to get to and from the continent.
Our Business Correspondent Seth Conway reports: