Eggs of the Clark’s anemonefish (Amphiprion clarkii). They are the size of a needle pinhead. You can already see the developed eyes and mouth.
In a group of anemonefish, a strict dominance hierarchy exists. The largest and most aggressive female is found at the top. Only two anemonefish, a male and a female, in a group reproduce through external fertilization.
Anemonefish are protandrous sequential hermaphrodites, meaning they develop into males first, and when they mature, they may become females. If the female anemonefish is removed from the group, such as by death, the largest and most dominant male becomes a female. The remaining males move up a rank in the hierarchy.