A green and blue eel appeared several times on The Muppet Show.
In addition to background appearances on episodes 116, 117, 122, and 312, the eel performed two solo numbers. Both were the UK Spots on their respective episodes.
In episode 124, the eel, performed by Jim Henson, sang "When I'm Not Near the Fish I Love." In episode 417, he was performed by Jerry Nelson and sang "Three Little Fishies."