Floral blenny 
Floral Wrasse 
Florida gar 
Flower cardinalfish 
Flying gurnard 
Forktail blenny 
Four-eye pygmygoby 
Four-eyed Butterflyfish 
Four-line wrasse 
Four-spotted butterflyfish 
Foursaddle Grouper 
Fowler's surgeonfish 
Foxface rabbitfish 
Freckled Goatfish 
Freckled madtom 
French Angelfish 
French grunt 
Freshwater Angelfish 
Fringed Flounder 
Fringelip Mullet 
Frogface goby 
Front Cichlid 
Frostfin Cardinalfish 
Geometric moray