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Clownfish, the beloved stars of “Finding Nemo,” are not only charming but also possess a remarkable ability to change their gender. In a clownfish group, the largest individual is typically a female, followed by a male, while the rest are sexually immature males.
Wrasses, a diverse family of colorful reef fish, are known for their remarkable ability to change from female to male (protogynous hermaphroditism ref). In many wrasse species, the largest female in a group will transform into a male when the dominant male is absent.
Moray eels, the enigmatic inhabitants of reef crevices and rock formations, are another marine species capable of changing their gender.
Gobies, a diverse family of small fish found in both freshwater and marine environments, include several species capable of changing their gender.