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July 15, 2009

"Transsexual" Fish


A favorite of divers in Australia, the blue groper grows to about three feet (one meter) long and can change its own sex. But its numbers are diving, and researchers are trying to throw the groper a lifeline
Bob Harcourt, Associate Professor Macquarie University: "The blue groper is a large fish, but the really sexy thing about Blue Groper is they start off as females. We’ve got lots of blue groper that are small green groper and as an old male dies then the largest most dominant females turns blue and becomes male.
And so one of the really cool things about these fish, is the sex ratio doesn’t really vary, but it is a function of how well protected they are. If you take a lot of males out, then the females have to spend a lot of their time turning into males, which means they can’t breed and they can’t lay eggs."

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