Ocellaris Clownfish

In general, a breeding pair of Ocellaris Clownfish lives with a number of other specimens in an anemone. Dominance is based on size: the female is the largest, and the reproductive male is the second-largest. The rest of the group is made up of smaller males that do not breed and have no functioning gonads. If the female dies, the reproductive male gains weight and becomes the female for that group. The largest non-breeding male then sexually matures and becomes the reproductive male.