The Hoopla Fish is a very small, green fish that wears a purple shirt and indigo pants. He opened his mouth widely when he yelled "Hoopla."
The Hoopla Fish continually interrupted the narrator every time he was going to say, "Sounds like a lot of hoopla to make over a little Krabby Patty, right?" After the Hoopla Fish shouted and cut off the narrator too many times, he got hit with a brick.
In the Spanish version he says "Hurra!" which means "Hooray!". This is a reference to a German punk song by Die Ärzte from the 90's.
In the German version he says "Hoppla!", which translates to "Oops!"
He is very popular on YouTube for memes and YouTube Poops.