Tallink has carried fewer passengers and vehicles in March but saw the number of cargo units rise.
The Estonian ferry owner transported 724,243 passengers last month, a decrease of 5.2% year-on-year.
Passenger vehicles slipped 4.1% to 79,642 units while cargo units increased by 17.5% to 31,974.
Tallink’s update came shortly after the company posted a new record for passenger volumes in 2016, when it carried 9.5m