There are quite a few. If you see the related link below it will be much easier.
Marlin, Coral, Nemo: Orange Clownfish
Dory, Pacific Regal Blue Tang
Gill: Moorish Idol
Bloat: Pufferfish
Peach: Starfish
Gurgle: Royal Gramma
Bubbles: Yellow Tang
Deb/Flo: Damselfish
Jacques: Pacific Cleaner Shrimp
Nigel, Gerald: Brown Pelican
School of Moonfish
Crush, Squirt: juvenile Sea Turtle
Mr. Ray: Spotted Eagle Ray
Bruce: Great White Shark
Anchor: Hammerhead Shark
Chum: Mako Shark
Tad: juvenile Yellow Longnose Butterflyfish
Pearl: juvenile Flapjack Octopus
…
Nemo, Marlin, Dory, the tank gang, the sharks, crush and nigel
Ellen Degeneres
Dory
Moonfish
Paracanthurus hepatus Class: Actinopterygii
Paracanthurus hepatus (Pacific blue tang)
Ellen Degeneres
A great script + Ellen Degeneres = Funny Dori
Dory
Disney pixar has, not confirmed finding dory yet, it is the squel to finding nemo.
"Rip it, roll it, and punch it"
Moonfish
Paracanthurus hepatus Class: Actinopterygii
Paracanthurus hepatus (Pacific blue tang)
Paracanthurus hepatus (Pacific blue tang)
"Escape" on the escape hatch on the submarine
Marlin (Nemo's dad), Coral (Nemo's mom) and Nemo
Bruse, He was one of the sharks that was trying to eat Dori and Marlin