Jethra is a purple fish. He is wearing ratty green overalls. His left tooth is shorter than the right one. He is also wearing an old brown hat.
Jethra was first seen eating at the Krusty Krab and Mr. Krabs thought he was eating a Krabby Patty. When Jethra turned around, Mr. Krabs was shocked that he was eating Chum Fricassee. Jethra then told Mr. Krabs that there weren't any open tables at the Chum Bucket so he had to get his order to go. He has never been seen or mentioned since Chum Fricassee.