Chum

From Pixar Wiki

Performer:	Bruce Spence
Appeared in:	Finding Nemo

Chum is a Shark seen in Finding Nemo. He is the Fish are Friends group. He, for fishing reasons, has a hook lodged in his snout. According to the movie, he HATES dolphins. Apparantly, he ate his 'Friend' in the group, who Marlin momentarily replaced.