This aquatic joyride from Pixar Animation Studios follows the adventures of a young clownfish that swims beyond his coral-reef colony and gets captured by divers; trapped in an aquarium inside a dentist’s office in Sydney, he and his tank mates plot their escape, while his cowardly father (the voice of Albert Brooks) tries to find him with the help of a neurotic and forgetful regal blue tang (Ellen DeGeneres in her best role to date). Edifying info about the ocean and its creatures mingles with clever gags (the sharks, worried about their image problem, struggle mightily to be nice to other fish), but at the heart of the film lies a father-son relationship that begins in tantrums and trauma but blossoms after both characters have overcome their fears and obstacles. Andrew Stanton (who worked on Monsters, Inc. and A Bug’s Life) directed. 101 min. Century 12 and CineArts 6, City North 14, Crown Village 18, Davis, Ford City, Gardens 7-13, Golf Glen, Lake, Lawndale, Lincoln Village, Norridge, 600 N. Michigan, 62nd & Western.