 The Environmental Protection Agency has designated the Corpus Christi Bay system as an estuary of national significance . More than 234 species of fish are found in the bay , including the Gafftopsail catfish , Hardhead catfish , Atlantic croaker , Atlantic cutlassfish , Black drum , Red drum , Southern flounder , Crevalle jack , Ladyfish , Inshore lizardfish , Atlantic midshipman , Silver perch , Pinfish , Smooth puffer , Scaled sardine , Bighead searobin , Sand seatrout , Spotted seatrout , Sheepshead , Gray snapper , Common snook , and the Tripletail . 
