The Italian boat crew said they picked up the migrants before docking into the Montenegro port of Zelenika early Tuesday. Police say two Moroccans, two people from Yemen, one from Afghanistan and one from Pakistan were also on the boat.
The group, which included four children, was in police custody at Zelenika.
It was not immediately clear where the migrants started their journey.
Montenegro has been largely spared from the migrant flow across the Balkans that peaked in 2016, with people fleeing wars and poverty in the Middle East, Africa and Asia trying to reach the Western Europe.