Guess you could look for a fish identification chart... After so many years of catching them, I can immediately tell the difference between a warsaw, scamp, gag, red....
Fish identification chart would be the best bet. I know AK McCallum's in Fayetteville has these type of saltwater charts as well as fresh water fish identification as well.
Lot's of internet FISH ID sites available as well, just google it up.
Here's a starter link for ya:
Fish Identification <--- link