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The light yellow sound effect fish is a character who appears in the episode "What Ever Happened to SpongeBob?"
He is light yellow and has light yellow eyes. He wears brown aviator clothing and has green goggles with blue shades and a black strap on his forehead. He has dark yellow fish and there are two black dots in the middle of his eyes and his mouth representing his nose.
He is one of the people making noises to scare SpongeBob when he is leaving Bikini Bottom, where he is standing in between two large rocks. Some other fish are also making weird noises in order to scare SpongeBob with the light yellow fish, which they succeed at doing.