Gurgle is a royal gramma fish who resides in the dentist's office fish tank. He is germophobic and incredibly pessimistic, doubting the possibility of Gill's plans working and getting increasingly nervous and frustrated when the plan to break the tank filter goes into motion. Regardless, he eventually escapes with the rest of the tank fish into the ocean. He often argues with Bloat.
The model for Gurgle was reused for the fish in Boundin'.
Gurgle wasn't referred to by name in the film. His name was given in promotional material of the film, however.
When the fish start bashing the AquaScum 2003 for foiling their escape plan before Dr. Sherman scoops Nemo out of the tank, Gurgle appears to hate the Aquascum the most, with him swimming up to it and yelling, "CURSE YOU, AQUASCUM!!!"
Ironically, after Gurgle yelled, "CURSE YOU, AQUASCUM!!!", his wish that the AquaScum filter would break down came true at the end of the movie when he and the rest of the Tank Gang escaped to freedom.
Also, it would contrast on his phobia on germs that the AquaScum 2003 cleans the tank and his doubts about escaping the tank.