From the Greek protos - first and andreios - male.

Protandry is a form of non-functional hermaphroditism in which hermaphroditic individuals function as males at younger ages and as females at older ages.

A type of sequential hermaphroditism in which an organism changes sex at some point in its life. Typically, species that have this phenomenon change sex as part of their reproductive cycle due to a particular social structure or upon reaching a certain age or size. Protandrous fishes include bony species in the families Pomacentridae, Sparidae, and Gobiidae.