The ferry company, which operates daily between Plymouth and Roscoff, in France, says it was left shocked by the Paris attacks.
The company has comprehensive security arrangements in place at all times both within its ports and on board its ships and has introduced additional security checks following the incidents in Paris.
A Brittany Ferries spokesman said: "As a French company, we are particularly shocked and appalled by the events that have unfolded in Paris, and our thoughts and prayers go out to all those affected by the attacks, their families and their friends.
"We take security and safety extremely seriously and they are always at the forefront of our minds.
"We have comprehensive security arrangements in place both in our ports and on board our ships and these arrangements are tightly controlled and governed by national and international legislation."