He begins the story as a nervous fish, but Nemo being taken immediately spurs him into action and he sets out on this wild adventure where he experiences more than he ever thought he would.

A clown fish named Marlin lives in the Great Barrier Reef and loses his son, Nemo, after he ventures into the open sea, despite his father's constant warnings about many of the ocean's dangers.

Nemo hatches as an undifferentiated hermaphrodite ... In any given community, the female is the largest fish, the breeding male is the second largest and the rest are sexually immature males.