Why does the barracuda eat coral in Finding Nemo?

In "Finding Nemo," the barracuda doesn't actually eat coral; instead, it attacks Marlin and Coral, Nemo's parents, in a dramatic scene at the beginning of the film. The barracuda's actions serve to establish the film's conflict and highlight the dangers of the ocean, ultimately leading to Marlin becoming a protective and anxious father. The encounter emphasizes themes of loss and the lengths a parent will go to for their child.