Are princess parrot fish asexual or sexual reproducers?

Explanation:

Getting an answer to this question has to be one of the weirdest things you'll ever come across. Nature knows no bounds in her variety of methods of insuring species survival.

These fish are sexual reproducers. The female lays the eggs and they begin an upward motion. At the same time, the male puts his sperm into the water.

What is really weird is that when the fertilized eggs hatch, the offspring are all females. Later, the larger fish become males.  That has to be unique.