After barges posing danger in Mandovi River, the increasing number of casinos is the next major concern for the port administration with a big race on to fill three more slots for operations of off-shore gambling vessels. As many as four off-shore casinos would now be cruising the river Mandovi with the government clearing two more - Kings and Pride of Goa. This is in addition to the existing two - Caravela and Leela’s.