The barracuda is seen in the beginning of the film as it looks at Marlin and Coral. Coral sees her eggs and rushes to protect them. The moment she moves, the barracuda attacks. Marlin tries to help Coral, but the barracuda knocks Marlin unconscious and eats Coral and her eggs, except one that later becomes Nemo.
The barracuda can be heard roaring as it attacks Marlin and Coral. In a similar vein to Glut the Shark from The Little Mermaid, this may have been done merely for dramatic purposes.
In real life, barracuda do not eat clownfish (or any other kind of fish) eggs.
In the 3-D rerelease, when the barracuda closes its teeth, its bottom lip is shown.
In the original storyboard there was supposed to be a brief sighting of Coral and her eggs in the barracuda's mouth. However, it was cut possibly for being too scary.
The barracuda appears
The barracuda stares at Marlin and Coral
The barracuda attacks the moment Coral moves
The barracuda opens its jaws
The barracuda gets into a fight with Marlin
Marlin vs. the barracuda
The barracuda slaps Marlin with its tail, knocking him out cold
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