The dentist took him off the reef.
4 seconds sound clip from the Finding Nemo movie soundboard.
You can hear this line at 00:28:42 in the Blu-ray version of the movie.
Quote context
[...]
- Root canal. And it's a doozy.
- Root Canal, huh? What did he use to open?
- He's been favouring that one.
- I hope he doesn't get surplus sealer at the portal terminus.
- New guy.
- The dentist took him off the reef.
- An outie. From my neck of the woods, eh?
- Sorry if I ever took a snap at you. Fish gotta swim. Birds gotta eat.
- Hey! No, no, no! Those aren't your fish. They're my fish. Come on. Go! Go, on! Shoo! Shoo!
- This here's Darla. She's my niece. She's gonna be eight this week.
[...]