The tropical fish are minor characters in The Backyardigans.
The tropical fish are sea creatures living in the ocean. They cannot speak. In "Into the Deep", mermaids Uniqua and Tasha come across a fish swimming by their garden and recognize it as an intruder. After telling it to leave, they use the "Mermaid Freak-Out" to blow it away.
The tropical fish are yellow with gray-black stripes. They have long dorsal fins on their heads and large eyes.