Tuna/ Mackerels
Scombridae
Sardines/ Herrings
Clupeidae
Grunts
Haemulidae
Porgies
Sparidae
Mojarras
Gerreidae
Snooks
Centropomidae
Parrotfish
Scaridae
Wrasses
Labridae
Groupers
Hamlet
Basses
Serranidae

Scorpionfish
Scorpaenidae
Bigeyes
Centropomidae
Damselfish
Pomacentridae
Spadefish
Epphidae
Pufferfish
Tetrodontidae
Porcupinefish/ Burrfish/ Balloonfish
Diodontidae
Triggerfish
Ballistidae
Filefish
Monacanthidae
Blennies
Blennidae
Triplefins
Tripterygiidae
Gobies
Gobiidae
Remoras
Echeneidae
Stargazers
Uranoscopidae
Brotulas
Bythitidae
Barracudas
Sphyraenidae
Needlefish
Belonidae
Halfbeaks
Hemirhamphidae
Pipefish
Sygnathidae
Trumpetfish
Aulostomidae
Moray eels
Muraenidae
Garden Eels
Congridae
Snake Eels
Ophichthidae
Flounders
Bothidae
Stingrays
Dasyatidae
Sharks
Tilefish
Malacanthidae
Dolphinfish
Coryphaenidae
Squirrefish/ Soldierfish
Holocentridae
Angelfish
Pomacanthidae
Below is a heuristic guide for the typical fin layouts found in many fish families. Although certainly not exhaustive, it may prove useful as a quick initial pointer towards identifying an unknown fish.
Snappers
Lutjanidae
Jacks
Carangidae
Goatfish
Mullidae
Frogfish
Antennariidae
Lizardfish
Synodontidae
Cardinalfish
Apogonidae