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Fish are the most diverse group of vertebrates 
on the planet from the gigantic whale shark

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to the tiniest minnow.

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They re over 32,000 species of fishes that 
are known and new ones are being discovered

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all the time.

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That s more species than all of the amphibians 
and reptiles and birds and mammals put together.

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Because of their diversity, fish have evolved 
varied reproductive strategies, ranging from

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the expected to the very bizarre.

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Whether it s they re born male and turn 
female, born female turn male, or change back

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multiple times, fish have found a way to utilize 
sexual reproduction to their advantage in

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pretty much every way you can imagine.

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This sort of mixing and matching, sometimes 
I ve thought of it as sexuality a la carte.

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Take a little female characteristic here, 
a male characteristic there and this is

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very common in nature.

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Sex change as a normal mode, the reproductive 
strategy for animals, is something that, I

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would say the general public doesn t know 
anything about.

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And they re absolutely fascinated when they 
hear about it for the first time.

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People are shocked almost some times, greatly 
surprised, entertained by what these animals do.

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Most people have seen the movie Finding 
Nemo, you know with the little anemone fish,

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and his mother disappears and his father raises 
him.

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What would happen in nature is that, when 
Nemo s mother disappeared, Nemo s father

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would change sex and become a female, Nemo 
would mature into a mature male, and they

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would form a mating pair.

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Wait, WHAT?

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What really happens when it s time for love 
in the sea?

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Why do some fish species change sex?