Damselfish

I just put in clownfish and read a book on them and it said damselfish were a
sub species of clowns. Does this mean the will produce females and males in
the same manner as clown fish? I have two dominoes, two striped, and two
yellow tailed blues in my tank. If they do acquire the sex in the same way,
will this affect all the damsels in the tank, or do they only do it with their
own sub species? I am thinking of breeding them eventually. They don't seem
to bother the clowns much, but on domino damsel has become so much larger than
all of the rest put together. Does anyone know where I can find out more info
on them?: MB