What does it mean when a fish's gender is anamorphic?

My understanding of the term "Anamorphic" in relation to gender would imply that the fish is progressively changing sex. If this is what you mean then there are a couple of species that come to mind like the Barramundi and the Marine Clown fish. There are also several African cichlids that do this too. What happens is at a certain stage in the life of the fish it changes sex.