Baby Rosario is a giant fish from Movie 6 that gets netted by the Straw Hats and is Muchigoro’s pet.
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When our friends take part in Baron Omatsuri’s first test, they are tricked by him, thinking that they have to catch a small goldfish, which is not the case with Baby Rosario, as he is huge for a goldfish. Through Chopper’s efforts, they do catch Baby Rosario at the last second.