Mermaid Theatre of Nova Scotia’s “The Rainbow Fish” brings Marcus Pfister’s colorful story to life on stage, as well as two of the author’s companion tales, “Rainbow Fish Discovers the Deep Sea” and “Opposites.” Mermaid Theatre has earned international acclaim for its unique interpretations of the beloved works of Eric Carle, Leo Lionni, and Sam McBratney, with its innovative puppetry, striking scenic effects, and evocative original music.