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A picture of a fish that can change sex

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We wanted to tell a story of seasonal change in One Ocean and to show how small changes in temperature can have a big influence on marine life in the seasonal seas. Our team then began to investigate and discovered that a rise in sea temperature triggers the males to engage in territorial battles over the right to spawn, and more interestingly, that all the big males that fight were once females. Having studied marine biology it was no surprise to me that kobudai change their sex. After all it is a member of the wrasse family who are well known to exhibit sequential hermaphroditism, meaning that for them sex change at some point in their life is a normal biological process generally to aid reproductive success. In fact, sex change is a very common reproductive strategy in many fish.
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Fish are the sex-switching masters of the animal kingdom

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Fish are the sex-switching masters of the animal kingdom | BBC Earth

As our society becomes more accustomed to conversations about sex and gender—in terms of biology, psychology, and justice—it is becoming clear just how complex and nuanced these topics can be. The research director of Future of Fish—a nonprofit incubator working to solve oceanic challenges—Hardt is currently engaging with organizations to find solutions to global overfishing problems. Having spent much of her career studying life among coral reefs, she became an expert in the sex lives of certain fish and ocean creatures, eventually writing the book Sex in the Sea St. Once Upon a Time there was a King and Queen who ruled over a peaceful kingdom. The peace came from order, and that order was imposed through fierce intimidation. No one dared rise up to challenge their reign.
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500 species of fish can change their sex in response to their environment: Research

The Kobudai is a hermaphroditic species, meaning it can change sex. Miranda Dyson explains the biological process Copyright: BBC In the first episode of Blue Planet II we met the Kobudai — the Asian sheepshead wrasse - that was introduced as a female, behaved like a female and looked like a female.
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Millions of people saw a dramatic example of this in the first episode of Blue Planet II, in which a ten-year-old female kobudai also known as an Asian sheepshead wrasse, Semicossyphus reticulatus changes into a male. After many months, the transformed male emerges from its lair larger than before, bearing testes, a huge bulbous forehead, and an aggressive nature. Now even larger than the existing dominant male it had previously mated with when female, the new male defeats the aged alpha in a violent battle for dominance.
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