The Yellowfin Grouper (Mycteroperca venenosa) is a common sight on the reefs.  The very tips of the pectoral fins are yellow, thus giving them their name.  I don't think they are quite as plentiful here as the Nassau Grouper, but they still abound.  This one is on a cleaning station, allowing small gobies and cleaning shrimp to enter its mouth and pick off small parasites and pieces of dead flesh from its gills. 

Here is another Yellowfin Grouper on cleaning station.  He was so dark that at first I thought it was a Black Grouper.  After I had taken several shots of him, he got tired of posing for me and moved away.  As he did so, his coloration changed completely, going from near black as shown in this photo to a very light gray.  I was absolutely astounded to see such a dramatic color change happen so quickly.  This photo was taken in the land of the giant barrel sponges--Sarah's Set.