Gray Snapper...

Gray snapper have several color phases depending on habitat.  They may be light reen on the back with rosy sides and white undersides, with silvery dorsal and tail fins.  Another phase is darker with an olive back, coppery sides, dusky dorsal and caudal fins and coppery pectoral, pelvic and anal fins.  There usually are faint vertical bars extending partway down from the back.  The centers of scales are colored olive on the back and rosy on the sides and are gray or silver at the margins.  This fish is more abundant around the West Indies than in Texas waters.  There, and in Florida, it has a peculiar habit of feeding on small arboreal crabs found in mangrove thickets.  Other food items are blue crabs, small fishes, shrimp and squid.  The fish fees at night but will bite during the day.  Fish of 1 to 2 pounds may be caught around passes and channels, using small baits fished on the bottom.  The flesh is reported to be excellent.

Source:  Saltwater Fishes of Texas:  A Guide to Knowing and Catching Bay and Gulf Fishes