Chum

Chum is a very hyperactive mako shark seen in Finding Nemo. He is in the "Fish are Friends, Not Food" support group. He, for fishing reasons, has a hook lodged in his snout. According to the movie, he hates dolphins. Apparently, he ate his "friend" in the group, who Marlin momentarily replaced. He is voiced by Bruce Spence.

Finding Nemo
Chum is first seen in the film when Bruce brings Marlin and Dory to the meeting. He is seen swimming around in circles with Anchor and having a shoving contest with him as Bruce approaches. He complains that he and Anchor have already gone through the snacks and he is still starving. The next scene shows Chum at the meeting saying the pledge, although he recites it in a monotone voice and looks somewhat board. He becomes more lively when Anchor mentions that dolphins are not their friends, he then says that dolphins think they are so cute. He then does an impression of a dolphin, complete with a "dolphin clap" which earns him a laugh from Anchor.

However, Bruce then moves on with the meeting and announces that the meeting was at step five: bring a fish friend. When Bruce sees that Anchor had his friend, he asks Chum where his friend is. Chum then gets a suspicious look and claims to have misplaced his friend and lets out a smile only for a fish skeleton to pop out of his mouth. He quickly sucks it back in and gives Bruce an innocent smile. Bruce says that it was alright and knew that it would be a difficult step and offered Chum one of his friends. Chum grabs Marlin and hugs him under his fin, much to Marlin's discomfort. As Bruce continues to talk, Marlin tries to leave the mako's grasp only for Chum to pull him closer. When Bruce announces that he had not eaten a fish in three weeks, Chum begins to clap his fins, hitting Marlin numerous times as he does so. Once Dory goes up on stage and announces that she had never eaten a fish he as well as Bruce and Anchor were stunned at first yet Chum broke the quiet by clapping and telling Dory "That's incredible!"

When Bruce turns to Marlin to ask whether he wants to go on stage, Chum gives Marlin a rub with his arm...er fin-pit. After Marlin is pushed up to the podium he announces that he is a clownfish which excites the sharks. Chum gets so excited that when he jerks back he ends up hitting his head on one of Anchors eyes. When he gets close to Marlin he is pushed back by Bruce and hits a metal object which results in a small "clang." He is able to shove his way in between his two friends telling Marlin that he loves jokes. Marlin agrees and starts to tell them a joke. However, as Marlin starts to rant, Chum looses interest, he then thinks that the jokes punch line is 'Nemo' causing him to burst in a fit of laughter and tries to get Bruce to laugh only to stop short and stating, "I don't get it." He then learns that Marlin was talking about his son, who was taken by divers. Chum then says that humans think they own everything.

He is then shocked and shares a sympathy look with Anchor when he finds out that Bruce never knew his father and as he gives his friend a hug his words of advise are, "We're all mates here, mate." As Bruce starts to calm down Marlin and Dory reappear with a divers mask which they start to fight over. When Marlin accidentally hurts Dory she starts to bleed causing Bruce to go into a feeding frenzy. Chum with the help of Anchor manages to subdue Bruce for a short time before the great white throws him off. As Bruce chases after the fish, Chum calls for Bruce to remember the steps, he then chases after him only to get stuck in an escape latch with Anchor. Finally, before the end of the chase, he apologizes to Marlin and Dory about Bruce's behavior. Chum was also the one to call Bruce's attention to the torpedo that was about to hit a live mine. His fate remained unknown throughout the movie until the end where he showed up at the reef dropping off Dory from a meeting, telling her to keep up with the program, before swimming off.

Disney Parks
Chum appears in The Sea with Nemo and Friends at Epcot and in Finding Nemo: The Musical at Disney's Animal Kingdom.

Trivia

 * When Chum was a pup, he attended a posh predator boarding school where he learned a tough accent from a caretaker.
 * In the Finding Nemo essential guide and sticker book, it is hinted that he hangs out with at least three different groups. One is the FEA which include Bruce and Anchor, the second is a group of tough sharks that nickname him snaggle-tooth, and a third one that includes posh sharks and referes to the former two groups as "reef raff."
 * He has a suviner fishing hook logged in his snout from a tussle with a fisherman.
 * He seems to be the most hyper out of all three sharks.