Yes they are the tropical teleosts a reef fish. The majority of reef fish do change sex, it is uncommon that they don’t.
Yes, there are fish that change sex over the course of their lifetime. A fish’s original sex is determined by inherited chromosome, meaning that all of the species of fish that change their sex have evolved from those whose sex was fixed for life. Changing their sex was presumably a capability that evolved to make for greater reproduction success. Conversions from female to male are now known to occur in species belonging to at least 14 families, while conversions from male to female are known in eight families. Unfortunately, chemicals in municipal wastewater, including estrogen, have been known to change the sex of fish; i.e., a school of trout can be made entirely male simply by adding a certain hormone to the water.
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