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- Dab (a type of flatfish)
- Daggertooth Pike Conger
- Daisy Parrotfish
- Damselfish
- Dancing Shrimp
- Darkfin Hind
- Darkfin Dwarf Goby
- Dartfish
- Davis’ Sea Star
- Deep Sea Anglerfish
- Deep Sea Dragonfish
- Deep Sea Jellyfish
- Deep Sea Octopus
- Deep Sea Shrimp
- Deepwater Cardinalfish
- Deepwater Flathead
- Deepwater Stingray
- Deepwater Whelk
- Delta Smelt
- Demersal Shark
- Demon Catfish
- Demon Eel
- Denison Barb (found in brackish waters)
- Desert Goby (tolerates salty waters)
- Devil Ray
- Devil Scorpionfish
- Devilfish (another name for the giant manta ray)
- Diamond Stingray
- Dicotyledon Shrimp
- Discus Fish (mainly freshwater but related to brackish environments)
- Dog Snapper
- Dogfish Shark
- Dolphin
- Dolphinfish (Mahi-Mahi)
- Donkey Dung Sea Cucumber
- Dorado (another name for the Mahi-Mahi)
- Dory (John Dory Fish)
- Dory Snapper
- Dottyback
- Doughboy Scallop
- Dragon Goby
- Dragon Moray Eel
- Dragon Nudibranch
- Dragon Sea Moth
- Dragonfish
- Driftfish
- Drifting Sea Cucumber
- Drum Fish
- Dugong
- Dumbo Octopus
- Dwarf Angelfish
- Dwarf Crocodilefish
- Dwarf Goby
- Dwarf Lantern Shark
- Dwarf Seahorse
- Dwarf Snake Eel
- Dwarf Sperm Whale
- Dusky Dolphin
- Dusky Grouper
- Dusky Shark
- Dusky Smoothhound
- Dusky Whaler Shark
- Dutch Clam
