The Fish-Man Island Saga (魚人島編 Gyojin-tō Hen?) is the first saga of the second half of the manga and anime series, One Piece, and is the seventh saga overall.
It takes place two years after the Straw Hat Pirates are separated after the events that took place at Marineford. It begins with the Straw Hats reuniting with each other at Sabaody Archipelago to prepare to set sail for the New World, but in order to enter there, they must first go through Fish-Man Island. They defeat the New Fish-Man Pirates and Flying Pirates, who planned on conquering and destroying the island, and make a declaration of war to the Emperor, Big Mom.