"protoandrous hermaphrodites: they start life as males (i.e. clownfish)
protogynous hermaphrodites: they start life as females (i.e. many angles)
simultaneous hermaphrodite: any two will do"
Oh sure, I have a million things to do and no time for RC right now but you have to go and post
this ??

I dunno, I do not have13, 10 or even <1 years of higher education in marine biology but I do read a lot, I do breed marine fish and I am a full time student at the School of Hard Knocks. I think it's more like this this:
protoandrous hermaphrodite: capable of transforming from unsexually assigned juvenile to male to female but not reversable.
protogynous hermaphrodite: capable of transforming from unsexualy assigned juvenile to female to male. Not reversable.
My understanding is that these possible changes are triggered by social and environmental factors beyond our comprehension at this time. In certain instances like two amphiprion clowns raised in isolation under ideal conditions there would be no reason for the dominant fish to "become male" and then "change" to female. It doesn't make sense, it will just develop as a female. In a group it would be a disadvantage if they were all "male" to start because the dominant male would see the others as rivals and drive them out. I have raised enough bangaii cardinals (protogynous) in groups to see how this works, if the dominant male sees a rival he will kill it. If his chosen mate is lost another will rise to the "queen" position. If you remove the pair from the group another fish will assume the dominant male position and choose another "queen".
Simultaneous hermaphrodite: capable of functioning as both male and female. As example look at the very common hamlets in the Caribbean, probably one of the most abundant fish in the location. I wonder why? Another example is the very common lysmata shrimp. Any two will not just become a "pair", but BOTH will carry and hatch eggs. In rare instances even one in isolation is capable os self fertilization, I have personally witnessed this.
I'm not trying to pick a fight, just think it'a a tad more complicated than "born" male and "becomes" female
