Rosario

Rosario was the giant pet goldfish of Muchigoro in the sixth One Piece movie. In the movie, when the Straw Hats participated in the first Trial of Hell issued by the Baron Omatsuri, they were initially tricked into thinking they had to catch small goldfish, but eventually caught her due to Chopper's Guard Point.

Trivia

 * Rosário is the portuguese word for rosary.