The Shitzu Squalo from the Ultimate Edition is a speedboat in a fade from pink to blue. It is moored at Washington Beach, meant for open water and Gambit Bay, and it has a weapons crate with explosives on board.
The full text: 'Perfect for casting in Gambit Bay and reeling in catches of all sorts, this gradient pink and blue Squalo docked at Washington Beach is made open-ocean-ready with an explosives-laden weapons crate.'
The Squalo has been a speedboat in the series since the 2002 game Grand Theft Auto: Vice City. Here it doubles as a fishing boat and an armed one.