There is a blue striped grouper in Florida waters of the Caribbean. The sex of this fish can change several times a day. If two fish mate to lay eggs, one of them is the female fish first and the other is the male fish. Once mating is over, they will exchange males and females before breeding.

Colorful eels, which live in coral reefs in the western Pacific Ocean and Taiwan Province Province of China, are black when they are young, and become male when they grow to 50 cm, and their bodies turn blue. And when they grow to about 90 cm, their bodies turn yellow and become females; When they grow to more than 65 cm, they will gradually become black-blue or blue males; When colorful eels grow to more than 90 cm, they will turn into hermaphroditic blue and yellow. Finally, when their body length reaches more than 1 10 cm, they will become golden females again.