Frank couldn't breathe underwater.
But where was he?
Percy turned in a full circle. Nothing. Then he glanced up. Hovering above him was a giant goldfish. Frank had turned -clothes, backpack, and all- into a koi the size of a teen-aged boy.
"dude." Percy sent his thoughts through the water, the way he spoke to other sea creatures. "A goldfish?"
Frank's voice came back to him: "I freaked. We were talking about goldfish, so it was on my mind. Sue me.

Autor: Rick Riordan