Most, such as wrasses and parrotfish, change from female to male. But the clownfish is one of the few known to change from male to female: If a dominant female dies, the dominant male will become ...

Green Sea Turtle: Female species can change their gender depending upon temperate but prior to birth only Banana Slug: Banana slugs are hermaphroditic, possessing both male and female reproductive ...

Since Nemo is the only other clownfish around, he becomes a male and mates with his father (who is now a female). Should his father die, Nemo would change into a female and mate with another male.