The body of Shiv Dhanush Reddy was found this afternoon by Goa marine police about a kilometre away from the vessel, police said.
Reddy, a techie from Hyderabad, had gone to Casino Carnival, an off-shore casino anchored in the river alongside Panaji city on Saturday.
A complaint lodged with the police stated that Reddy slipped off from the second deck of the ship and fell into the river.
"The deck was slippery due to heavy rains," police spokesman John Aguiyar said.
Police inspector Rajendra Prabhudesai said an offence has been registered against the casino management for negligence and investigations were going on.
