Clownfish start off male, but if the female dies the dominant male will change into a female. The male-to-female sex-change occurs first in the fish's brain and only later involves the gonads - sometimes after a delay of months or even years.

The female pairs up with a single male, the largest of the males available, to mate for life. The fish spawn around the full moon.
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More at https://www.scubatravel.co.uk/marine-life/red-sea-clownfish.html