Nemo is a clown fish. He is the son of Marlin and Cora. One day a Barracuda swallowed up Cora and her eggs. Only one egg survived and that egg was Nemo. What is a Barracuda? a Barracuda is a predator. On the first day of school Nemo swims with his class on the slope of the coral reef. When Marlin finds out, he immediately swims after the class, but it is too late. Nemo is captured by a diver and kidnapped.