Hi Angie.
I am back again to contradict myself. I have just found a definition on a site which Big Dave [bless him] recommended some weeks ago and which I have bookmarked. Try:
http://www.onelook.com/
which searches any number of dictionaries and immdediately threw up three definitions for sunfish - the third of which is, more or less, what you are looking for.
Caravaggio