Classification of fish
- Myxiniformes - Hagfishes
- Petromyzontiformes - Lampreys
- Hexanchiformes - Frill and cow sharks
- Heterodontiformes - Bullhead and horn sharks
- Orectolobiformes - Carpet sharks
- Lamniformes - Mackerel sharks
- Carchariniformes - Ground sharks
- Squaliformes - Bramble, sleeper and dogfish sharks
- Pristiophoriformes - Saw sharks
- Squatiniformes - Angel sharks
- Pristiformes - Sawfish
- Torpediniformes - Electric rays
- Rajiformes - Skates and rays
- Chimaeriformes - Chimaeras
- Polypteriformes - Bichirs
- Acipenseriformes - Sturgeons and paddlefishes
- Lepisosteiformes - Gars
- Amiiformes - Bowfins
- Osteoglossiformes - Bony tongues
- Elopiformes - Tarpons and tenpounders
- Albuliformes - Bonefishes
- Notacanthiformes - Halosaurs and deep-sea spiny eels
- Anguilliformes - Eels and morays
- Saccopharyngiformes - Swallowers and gulpers
- Clupeiformes - Herrings
- Gonorhynchiformes - Milkfish
- Cypriniformes - Carps
- Characiformes - Characins
- Siluriformes - Catfish
- Gymnotiformes - Knifefishes
- Esociformes - Pikes and mudminnows
- Osmeriformes - Smelts
- Salmoniformes - Salmons
- Stomiiformes - Lightfishes and dragonfishes
- Ateleopodiformes - Jellynose fishes
- Aulopiformes - Grinners
- Myctophiformes - Lanternfishes
- Lampridiformes - Velifers, tube-eyes and ribbonfishes
- Polymixiiformes - Beardfishes
- Percopsiformes - Trout-perches, pirate perches and cavef
- Gadiformes - Cods
- Ophidiiformes - Cusk eels
- Batrachoidiformes - Toadfishes
- Lophiiformes - Anglerfishes
- Gobiesociformes - Clingfishes
- Atheriniformes - Silversides
- Cyprinodontiformes - Rivulines, killifishes and live bearers
- Beloniformes - Needle fishes
- Stephanoberyciformes - Pricklefishes, bigscales and gibberfishes
- Beryciformes - Sawbellies
- Cetomimiformes - Whalefishes
- Zeiformes - Dories
- Gasterosteiformes - Sticklebacks and seamoths
- Syngnathiformes - Pipefishes and seahorses
- Synbranchiformes - Spiny eels
- Scorpaeniformes - Scorpionfishes and flatheads
- Perciformes - Perch-likes
- Pleuronectiformes - Flatfishes
- Tetraodontiformes - Puffers and filefishes
- Coelacanthiformes - Coelacanths
- Ceratodontiformes - Australian lungfishes
- Lepidosireniformes - South American and African lungfishes
