Nemo (voice of Alexander Gould) has led a sheltered life with his over protective father, Marlin. But despite his fathers doting and a disability of a smaller fin, he wants to break away and do normal young fish things with the rest of the young fish. After getting in a fight with his father he finds himself captured by a diver and put in a fish tank with a group of fish with an unusual mix of personalities.

Clownfish get their name from their distincmtive black and white markings. They has a symbiotic relationship with the sea anemone; the clownfishes bright color can attract other fish looking for a meal, the fish will be lured to the anemone where it will be stung and consumed and the Clownfish will get the remains. Because of this relationship they have developed imunity to the anemone's sting. There are 28 different species of Clownfish, and specific species are limited to small regions of the world and found nowhere else; there are no clownfish found in the Atlantic Ocean.