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Free Learning from The Open University. In many sequential hermaphrodite fishes, tissues of both sexes are present in the gonad prior to sex change whereas in others reproductive tissues are completely replaced by the secondary sex. So by changing sex, lifetime reproductive success is maximized the combined number of offspring you produce as a female and then a male or the other way round. Under these circumstances, reproducing initially as a female when small and then changing sex and becoming a male when large is the best strategy in order to maximize the number of offspring you leave in the next generation. Our partners OpenLearn works with other organisations by providing free courses and resources that support our mission of opening up educational opportunities to more people in more places. Explore ocean depths, currents, temperatures and find out more about the future of our oceans. The Open University is authorised and regulated by the Financial Conduct Authority in relation to its secondary activity of credit broking. It is not easily explained by the size advantage model however. How does sex change occur. And then, as we watched she slowly but surely morphed into a male — displayed male behaviours and developed male characteristics. It is documented in at least 27 families of fish, spread across nine orders and displays three patterns. We invite you to discuss this subject, but remember this is a public forum. Latest OpenLearn pages Subscribe to our 'Why do some fish change sex. For further information, take a look at our frequently asked questions which may give you the support you need. This transformation can occur rapidly, in the blue-headed wrasse taking as little as 8 days.
Meanwhile, Swiss researchers have found other suspected gender-bender chemicals from sun creams and oils building up in fish in their.
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