Fish species that start with the letter O include a variety of unique and interesting creatures from both freshwater and saltwater environments. The Ocean Sunfish is one of the largest bony fish in the world, while the Oscar is a popular aquarium species.
Other notable fish include the colorful Ocellaris Clownfish and the deep-sea Orange Roughy. This list highlights a broad selection of scientifically recognized fish species starting with O, from the striking Ornate Wrasse to the elusive Oyster Toadfish.
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List of Fish That Start With O
- Ocean Sunfish
- Oscar
- Olive Flounder
- Opah
- Ocellaris Clownfish
- Orange Roughy
- Ornate Wrasse
- Oyster Toadfish
- Oxeye Tarpon
- Oriental Sweetlips
- Orange Chromide
- Oilfish
- Omani Bream
- Orangefin Anemonefish
- Ocellated Moray
- Orangespot Surgeonfish
- Ocellated Snakehead
- Ochre Sea Perch
- Octopusfish
- Orange Sea Pen Goby
- Old Wife
- Orange-lined Triggerfish
- Onefin Skilletfish
- Otterfish
- Ornate Butterflyfish
- Ox-eye Herring
- Orangebar Wrasse
- Orangeback Fairy Wrasse
- Orangeshoulder Tang
- Oriental Goby
- Olive Bass
- Oceanic Whitetip Shark
- Ornate Boxfish
- Orangemouth Lizardfish
- Ornate Angelfish
- Ocellated Stingray
- Orange Skunk Clownfish
- Orbicular Batfish
- Orange-spotted Filefish
- Ornate Cardinalfish
- Orange Dartfish
- Orange Pufferfish
- Omani Rabbitfish
- Orange Blenny
- Orange-eye Tetra
- Olive Rockfish
- Ocellated Wrasse
- Orange-striped Triggerfish
- Orangehead Cichlid
- Olive Catfish
- Oilfin Molly
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