Cal Mac is suspending ferry bookings due to the RMT crews strike.
Western Isles ferries are set to be tied up in port all day Friday 10 July as crews down tools.
Crews are striking over fears about job losses, cuts to income and pensions in the
face of transferring state-
The industrial action has hit crowds of islanders heading off for the T in the Park concert next weekend.
Tourists and islanders planning to travel are also forced to make alternative arrangements.
B&B's and hotels face cancellations as the uncertainty over Hebridean bookings mean some visitors opt to go elsewhere.
Cal Mac is suspending advance reservations due to disruptions over the RMT dispute.
A Cal Mac statement said the RMT strike "is likely to cause severe disruption and as a result it has been necessary to stop taking bookings for dates this week.
"Should the situation change and industrial action is averted, we will open the booking system back up to our customers.
"CalMac would like to apologise for the impact this disruption may have to our customers."
Further ferry disruption is inevitable on the Saturday as ferries will be stretched to cope with the backlog in stranded traffic.
Last week's strike caused chaos with no Western Isles ferries sailing at all.
Tourists and islanders were stranded, businesses lost money, and the subsequent backlog of ferry traffic created more travel problems on the Saturday.
Cal Mac suspends ferry bookings over RMT strike
4 July 2015