- Abyssocottidae -- Deep-water Sculpins
- Acanthoclinidae
- Acanthuridae -- Surgeonfishes, Tangs, Unicornfishes family, Unicornfishes, Sawtails
- Acestrorhynchidae
- Achiridae -- American soles
- Achiropsettidae
- Acipenseridae -- Sturgeons
- Acropomatidae -- Lanternbellies, Temperate Ocean-basses
- Adrianichthyidae -- Ricefishes
- Ageneiosidae
- Agonidae -- Poachers
- Akysidae -- Stream Catfishes
- Alabetidae
- Albulidae -- Bonefishes
- Alepisauridae -- Lancefishes
- Alepocephalidae -- Slickheads
- Alestidae
- Alestiidae -- African Tetras
- Alopiidae -- Thresher Sharks, Thresher sharks
- Amarsipidae
- Ambassidae -- Asiatic Glassfishes
- Amblycipitidae -- Torrent Catfishes
- Amblyopsidae -- Cavefishes
- Amiidae -- Bowfins
- Ammodytidae -- Sand Laces, Sandlances
- Amphiliidae -- Loach Catfishes
- Anabantidae -- Climbing Gouramies
- Anablepidae -- Four-eyed Fishes, Onesided Livebearers and White-eye, Onesided Livebearers & White-eye, Whiteeyes
- Anacanthobatidae -- Smooth Skates
- Anarhichadidae -- Wolffishes
- Anguillidae -- Freshwater Eels, Freshwater eels
- Anisochromidae
- Anomalopidae -- Lanterneye Fishes, Flashlightfishes
- Anoplogastridae -- Fangtooth
- Anoplopomatidae -- Sablefishes
- Anostomidae -- Headstanders
- Anotopteridae -- Daggertooth
- Antennariidae -- Frogfishes
- Aphredoderidae -- Pirate Perches
- Aphyonidae
- Apistidae
- Aploactinidae -- Velvetfishes
- Aplocheilidae -- Killifishes
- Aplochitonidae
- Aplodactylidae -- Marblefishes
- Apogonidae -- Cardinalfishes
- Apteronotidae -- Ghost Knifefishes
- Aracanidae
- Arapaimidae -- Bonytongues
- Argentinidae -- Argentines or Herring Smelts, Argentines, Herring smelts
- Arhynchobatidae
- Ariidae -- Sea Catfishes, Seacatfishes
- Ariommatidae -- Ariommatids
- Arripidae -- Australian Salmon
- Artedidraconidae -- Barbled Plunderfishes
- Aspredinidae -- Banjo Catfishes
- Astroblepidae -- Naked Sucker-mouth Catfishes
- Astronesthidae
- Ateleopodidae -- Jellynose Fishes
- Atherinidae -- Silversides
- Atherinopsidae -- Neotropical Silversides, American silversides
- Auchenipteridae -- Driftwood Catfishes
- Aulopidae -- Aulopus, Flagfins
- Aulorhynchidae -- Tubesnouts
- Aulostomidae -- Trumpetfishes
- Badidae
- Bagridae -- Bagrid Catfishes
- Balistidae -- Triggerfishes, Durgons
- Balitoridae -- River Loaches
- Banjosidae
- Barbourisiidae -- Velvet Whalefishes
- Bathyclupeidae
- Bathydraconidae -- Antarctic Dragonfishes, Antarctic dragonfishes
- Bathylagidae -- Deep-sea Smelts
- Bathylutichthyidae
- Bathymasteridae -- Ronquils
- Bathypteroidae
- Bathysauridae
- Bathysauroididae
- Batrachoididae -- Toadfishes, Monkfishes
- Bedotiidae -- Madagascar Rainbowfishes
- Belonidae -- Needlefishes, Houndfishes
- Belontiidae
- Bembridae -- Deepwater Flatheads
- Berycidae -- Alfonsinos
- Blenniidae -- Combtooth Blennies
- Bothidae -- Lefteye Flounders
- Bovichthyidae
- Bovichtidae -- Thornfishes
- Brachaeluridae -- Blind Sharks
- Brachionichthyidae -- Handfishes
- Bramidae -- Pomfrets
- Branchiostegidae
- Bregmacerotidae -- Codlets
- Bythitidae -- Viviparous Brotulas
- Cadidae
- Caesionidae -- Fusiliers
- Callanthiidae -- Splendid Perches
- Callichthyidae -- Callichthyid Armored Catfishes
- Callionymidae -- Dragonets
- Callorhinchidae -- Plownose Chimaeras
- Caproidae -- Boarfishes
- Caracanthidae -- Orbicular Velvetfishes
- Carangidae -- Jacks and Pompanos, Jacks, Moonfishes
- Carapidae -- Pearlfishes
- Carapodidae
- Carcharhinidae -- Requiem Sharks, Tiger sharks
- Caristiidae -- Manefishes
- Catostomidae -- Suckers
- Caulophrynidae -- Fanfins
- Centracanthidae
- Centrarchidae -- Sunfishes
- Centriscidae -- Snipefishes, Shrimpfishes
- Centrogeniidae
- Centrolophidae -- Medusafishes, Ruffs
- Centrophoridae
- Centrophrynidae -- Deep-sea Anglerfish
- Centropomidae -- Snooks
- Cepolidae -- Bandfishes
- Ceratiidae -- Seadevils
- Ceratodontidae -- Australian Lungfishes
- Cetomimidae -- Flabby Whalefishes
- Cetopsidae -- Whale Catfishes
- Cetorhinidae -- Basking Sharks, Basking sharks
- Chacidae -- Squarehead or Angular Catfish, Squareheads, Angular catfish
- Chaenopsidae -- Pike- Tube- and Flagblennies, Pike blennies
- Chaetodontidae -- Butterflyfishes
- Champsodontidae
- Chanidae -- Milkfish
- Channichthyidae -- Crocodile Icefishes
- Channidae -- Snakeheads
- Characidae -- Characins
- Characidiidae
- Chaudhuriidae
- Chauliodontidae
- Chaunacidae -- Sea Toads
- Cheilodactylidae -- Morwongs
- Cheimarrhichthyidae -- Torrentfish
- Cheimarrichthyidae
- Chiasmodontidae
- Chilodontidae
- Chimaeridae -- Shortnose Chimaeras or Ratfishes, Shortnose chimaeras
- Chirocentridae -- Wolf Herring
- Chironemidae -- Kelpfishes
- Chlamydoselachidae -- Frilled Sharks
- Chlopsidae -- False Morays, Falsemoray eels
- Chlorophthalmidae -- Greeneyes
- Cichlidae -- Cichlids
- Cirrhitidae -- Hawkfishes
- Citharidae -- Citharids
- Citharinidae
- Clariidae -- Airbreathing Catfishes
- Clinidae -- Clinids, Ophiclinidae
- Clupeidae -- Herrings, Shads, Sardines, Menhadens
- Cobitidae -- Loaches
- Coiidae
- Colocongridae
- Comephoridae -- Baikal Oilfishes
- Congiopodidae -- Racehorses or Pigfishes, Racehorses
- Congridae -- Conger and Garden Eels, Conger eels, Garden eels
- Congrogadidae
- Coracinidae
- Coryphaenidae -- Dolphinfishes, Dorados
- Cottidae -- Sculpins
- Cottocomephoridae
- Cottunculidae
- Cranoglanididae -- Armorhead Catfishes
- Creediidae -- Sandburrowers
- Crenuchidae
- Cryptacanthodidae -- Wrymouths
- Ctenoluciidae -- Pike-characids
- Curimatidae
- Cyclopteridae
- Cyematidae -- Lumpfishes
- Cynodontidae
- Cynoglossidae -- Tonguefishes, Tonguesoles
- Cyprinidae -- Minnows, Carps
- Cyprinodontidae -- Pupfishes
- Cyttidae
- Dactylopteridae -- Flying Gurnards
- Dactyloscopidae -- Sand Stargazers, Sand stargazers
- Dalatiidae -- Sleeper Sharks
- Dasyatidae -- Stingrays, Whiptail stingrays
- Datnioididae
- Dentatherinidae -- Tusked Silversides
- Denticipitidae -- Denticle Herring
- Derichthyidae -- Longneck Eels
- Diceratiidae -- Double Anglers
- Dichistiidae -- Galjoen Fishes
- Dinolestidae -- Long-finned Pike
- Dinopercidae -- Cavebasses
- Diodontidae -- Porcupinefishes Burrfishes, Porcupinefishes
- Diplomystidae
- Diretmidae -- Spinyfishes
- Doradidae -- Thorny Catfishes
- Draconettidae
- Drepaneidae -- Sicklefishes
- Dysommatidae
- Echeneidae -- Remoras
- Echinorhinidae -- Bramble Sharks, Prickly sharks
- Elassomatidae -- Pygmy Sunfishes
- Electrophoridae
- Eleginopidae
- Eleotridae -- Sleepers
- Eleotrididae
- Elopidae -- Tenpounders
- Embiotocidae -- Surfperches
- Emmelichthyidae -- Rovers
| - Engraulidae -- Anchovies, Anchovetas
- Enoplosidae -- Oldwife
- Ephippidae -- Spadefishes, Batfishes, Scats
- Ephippididae
- Epigonidae -- Deepwater Cardinalfishes
- Erethistidae
- Eretmophoridae
- Ereuniidae
- Erythrinidae -- Trahiras
- Eschmeyeridae
- Esocidae -- Pikes
- Euclichthyidae -- Eucla Cods
- Eurypharyngidae -- Gulpers
- Eutaeniophoridae
- Evermannellidae -- Sabertooth Fishes
- Exocoetidae -- Flyingfishes
- Fistulariidae -- Cornetfishes
- Formionidae
- Fundulidae -- Topminnows, Killifishes
- Gadidae -- Cods, Haddocks
- Gadopsidae
- Galaxiidae -- Galaxiids
- Gasteropelecidae -- Freshwater Hatchetfishes
- Gasterosteidae -- Sticklebacks, Tubesnouts
- Gempylidae -- Snake Mackerels, Snake mackerels
- Geotriidae -- Southern Lampreys
- Gerreidae -- Mojarras
- Gibberichthyidae -- Gibberfishes
- Gigantactinidae -- Whipnose Anglers
- Giganturidae -- Telescopefish
- Ginglymostomatidae -- Nurse Sharks, Nurse sharks
- Girellidae
- Glaucosomatidae -- Pearl Perches
- Glaucosomidae
- Gnathanacanthidae -- Red Velvetfish
- Gobiesocidae -- Clingfishes, Singleslits
- Gobiidae -- Gobies, Specter gobies
- Gobioididae
- Gonorynchidae -- Beaked Salmons
- Gonostomatidae -- Bristlemouths
- Goodeidae -- Splitfins
- Grammatidae -- Basslets
- Grammicolepididae -- Grammicolepidids
- Grammidae
- Grammistidae
- Gymnarchidae
- Gymnotidae -- Naked-back Knifefishes
- Gymnuridae -- Butterfly Rays, Butterfly rays
- Gyrinocheilidae -- Algae Eaters
- Haemulidae -- Grunts, Sargos
- Halosauridae -- Halosaurs
- Harpadontidae
- Harpagiferidae -- Spiny Plunderfishes
- Helogenidae
- Helostomatidae -- Kissing Gourami
- Hemigaleidae -- Weasel Sharks
- Hemiodidae
- Hemiodontidae
- Hemiramphidae -- Halfbeaks
- Hemirhamphidae
- Hemiscylliidae -- Bamboo Sharks
- Hemitripteridae -- Sea Ravens or Sailfin Sculpins, Sea ravens, Sailfin sculpins
- Hepsetidae
- Heptapteridae
- Heterenchelyidae -- Mud eels
- Heterodontidae -- Bullhead, Horn, or Port Jackson Sharks, Bullhead, Horn, Port jackson sharks, Bullhead sharks
- Heteropneustidae -- Airsac Catfishes
- Hexagrammidae -- Greenlings
- Hexanchidae -- Cow Sharks, Sevengill sharks
- Hexatrygonidae -- Sixgill Stingrays
- Himantolophidae -- Footballfishes
- Hiodontidae -- Mooneyes
- Hispidoberycidae
- Holocentridae -- Squirrelfishes, Soldierfishes
- Homalopteridae
- Hoplichthyidae -- Ghost Flatheads
- Horaichthyidae
- Hypnidae
- Hypophthalmidae
- Hypopomidae
- Hypoptychidae -- Sand Eel
- Icelidae
- Icosteidae -- Ragfish
- Ictaluridae -- North American Freshwater Catfishes
- Idiacanthidae
- Indostomidae
- Inermiidae -- Bonnetmouths
- Ipnopidae
- Isonidae
- Istiophoridae -- Bllfishes, Sailfishes
- Jenynsiidae
- Kneriidae -- Shellears
- Kraemeriidae -- Sand Darters
- Kuhliidae -- Aholeholes, Flagtails
- Kurtidae -- Nurseryfishes
- Kyphosidae -- Sea Chubs, Seachubs
- Labracoglossidae
- Labridae -- Wrasses, Sheepheads
- Labrisomidae -- Labrisomids, Sargassum blennies
- Lacantuniidae
- Lactariidae -- False Trevallies
- Lamnidae -- Mackerel Sharks or White Shark, Mackerel sharks, White shark, Mako sharks
- Lampridae -- Opah
- Lateolabracidae
- Latidae
- Latimeriidae -- Gombessa
- Latridae -- Trumpeters
- Latrididae
- Lebiasinidae
- Leiognathidae -- Slimys, Slipmouths, or Ponyfishes, Slimys, Slipmouths
- Lepidogalaxiidae -- Salamanderfishes
- Lepidosirenidae -- Aestivating Lungfishes
- Lepisosteidae -- Gars
- Leptobramidae -- Beachsalmon
- Leptochariidae -- Barbeled Houndsharks
- Leptochilichthyidae -- Leptochilichthyids
- Leptoscopidae -- Southern Sandfishes
- Lethrinidae -- Emperors or Scavengers, Emperors
- Limnichthyidae
- Linophrynidae -- Leftvents
- Liparidae -- Snailfishes
- Lipogenyidae
- Lobotidae -- Tripletails
- Lophichthyidae -- Lophyichthyid Frogfishes
- Lophiidae -- Goosefishes
- Lophotidae -- Crestfishes
- Loricariidae -- Armored Catfishes
- Lotidae -- Hakes, Burbots
- Luciocephalidae
- Lutjanidae -- Snappers
- Luvaridae -- Louvar, Luvars
- Macrocephenchelyidae
- Macropodinae
- Macrorhamphosidae
- Macrouridae -- Grenadiers or Rattails, Grenadiers
- Macrurocyttidae
- Malacanthidae -- Tilefishes, Whitefishes
- Malacosteidae
- Malapteruridae -- Electric Catfishes
- Mastacembelidae -- Spiny Eels
- Megachasmidae -- Megamouth Sharks
- Megalomycteridae -- Largenose Fishes
- Megalopidae -- Tarpons
- Melamphaeidae
- Melamphaidae -- Bigscale Fishes or Ridgeheads, Bigscale fishes
- Melanocetidae -- Black Seadevils
- Melanonidae -- Melanonids
- Melanostomiidae
- Melanotaeniidae -- Rainbowfishes, Blue Eyes
- Menidae -- Moonfish
- Merlucciidae -- Merluccid Hakes, Merluccid hakes
- Microdesmidae -- Wormfishes, Worm gobies
- Microstomatidae
- Mirapinnidae -- Hairyfish, Tapetails or Ribbonbearers, Tapetails
- Mitsukurinidae -- Goblin Shark
- Mobulidae
- Mochokidae -- Squeakers or Upside-down Catfishes, Squeakers, Upside-down catfishes
- Molidae -- Molas or Ocean Sunfishes, Molas, Ocean sunfishes
- Monacanthidae -- Filefishes, Leatherjackets
- Monocentridae -- Pinecone Fishes
- Monocentrididae
- Monodactylidae -- Moonyfishes or Finferfishes, Moonyfishes
- Monognathidae
- Moridae -- Morid Cods, Mora cods
- Moringuidae -- Worm or Spaghetti Eels, Worm eels, Spaghetti eels
- Mormyridae -- Elephantfishes
- Moronidae -- Temperate Basses
- Mugilidae -- Mullets
- Mugiloididae
- Mullidae -- Goatfishes
- Muraenesocidae -- Pike Congers, Pikeconger eels
- Muraenidae -- Moray Eels, Reef eels
- Muraenolepididae -- Eel Cods
- Myctophidae -- Lanternfishes
- Myliobatidae -- Eagle Rays, Manta Rays, Eagle rays
- Myrocongridae -- Congermoray eels
- Myxinidae -- Hagfishes
- Nandidae -- Asian Leaffishes
- Narcinidae -- Numbfishes, Electric rays
- Narkidae
- Nemastistiidae -- Roosterfish
- Nematistiidae -- Roosterfish, Roosterfishes
- Nematogenyidae -- Mountain Catfishes
- Nemichthyidae -- Snipe Eels
- Nemipteridae -- Threadfin Breams, Whiptail Breams
- Neoceratiidae -- Toothed Seadevils
- Neoscopelidae
- Neosebastidae
- Neostethidae
- Nettastomatidae -- Duckbill Eels, Duckbill eels
- Nomeidae -- Driftfishes, Man-of-war-fishes
- Normanichthyidae
- Notacanthidae -- Deep-sea Spiny Eels
- Notocheiridae -- Surf Sardines
- Notograptidae
- Notopteridae -- Featherbacks or Knifefishes, Featherbacks
- Notosudidae -- Waryfishes
- Nototheniidae -- Cod Icefishes
- Odacidae -- Cales, Weed-whitings
- Odontaspididae -- Sand Tigers, Sandtiger sharks
- Odontobutidae
- Ogcocephalidae -- Batfishes
- Olyridae -- Longtail Catfishes
- Omosudidae
- Oneirodidae -- Dreamers
- Ophichthidae -- Snake Eels, Sand eels
- Ophidiidae -- Cusk-eels, Cuskeels
- Opisthoproctidae -- Barreleyes or Spookfishes, Barreleyes
| - Opistognathidae -- Jawfishes
- Oplegnathidae -- Knifejaws
- Orectolobidae -- Carpet or Nurse Sharks, Carpet sharks, Nurse sharks
- Oreosomatidae -- Oreos
- Oryziatidae
- Osmeridae -- Smelts
- Osphronemidae -- Gouramies
- Osteoglossidae -- Arowanas
- Ostraciidae -- Boxfishes, Cowfishes
- Ostracoberycidae
- Owstoniidae
- Pangasiidae -- Shark Catfishes
- Pantodontidae -- Freshwater Butterflyfish
- Parabembridae
- Parabrotulidae -- False Brotulas
- Parakysidae -- Parakysid Catfishes
- Paralepididae -- Barracudinas
- Paralichthyidae -- Large-tooth Flounders, Sandabs
- Parascorpididae -- Jutjaws
- Parascyllidae
- Parascylliidae -- Collared Carpet Sharks
- Paraulopidae
- Parazenidae -- Parazen
- Parodontidae
- Pataecidae -- Australian Prowfishes
- Pegasidae -- Seamoths
- Pempheridae -- Sweepers
- Pentacerotidae -- Armorheads
- Pentapodidae
- Percichthyidae -- Temperate Perches
- Percidae -- Perches
- Perciliidae
- Percophidae -- Duckbills
- Percophididae
- Percopsidae -- Trout-perches
- Peristediidae -- Armored Searobins or Armored Gurnards, Armored searobins, Armored gurnards
- Petromyzonidae
- Petromyzontidae -- Lampreys
- Phallostethidae -- Priapiumfishes
- Pholidae -- Gunnels
- Pholidichthyidae -- Convict Blenny
- Pholididae
- Phosichthyidae -- Lightfishes
- Phractolaemidae -- Hingemouths
- Phycidae -- Phycid Hakes
- Pimelodidae -- Long-whiskered Catfishes
- Pinguipedidae -- Sandperches
- Platycephalidae -- Flatheads
- Platyrhinidae
- Platytroctidae -- Tubeshoulders
- Plecoglossidae -- Ayu Fish
- Plectrogenidae
- Plesiobatidae -- Deepwater Stingray
- Plesiopidae -- Roundheads
- Pleuronectidae -- Righteye Flounders, Turbots
- Plotosidae -- Eeltail Catfishes
- Poeciliidae -- Poeciliids, Toothcarps
- Polycentridae -- Leaffishes
- Polymixiidae -- Beardfishes
- Polynemidae -- Threadfins
- Polyodontidae -- Paddlefishes
- Polyprionidae -- Wreckfishes, Seabasses
- Polypteridae -- Bichirs
- Pomacanthidae -- Angelfishes
- Pomacentridae -- Damselfishes, Majors
- Pomatomidae -- Bluefishes
- Potamotrygonidae -- River Stingrays
- Priacanthidae -- Bigeyes or Catalufas, Bigeyes, Glasseyes
- Pristidae -- Sawfishes
- Pristigasteridae -- Pristigasterids
- Pristiophoridae -- Saw Sharks
- Prochilodontidae
- Profundulidae -- Middle American Killifishes
- Proscylliidae -- Finback Catsharks
- Protopteridae -- African Lungfishes
- Psettodidae -- Psettodids
- Pseudaphritidae
- Pseudocarchariidae -- Crocodile Sharks
- Pseudocharchariidae -- Crocodile sharks
- Pseudochromidae -- Dottybacks
- Pseudogrammidae
- Pseudomugilidae -- Blue Eyes
- Pseudopimelodidae -- Bumblebee Catfishes, Dwarf Marbled Catfishes
- Pseudoplesiopidae
- Pseudorajidae
- Pseudotriakidae -- False Catsharks
- Pseudotrichonotidae
- Psilorhynchidae
- Psilorhyncidae
- Psychrolutidae -- Fatheads
- Ptereleotridae -- Dart-fishes
- Ptilichthyidae -- Quillfish
- Rachycentridae -- Cobia
- Radiicephalidae
- Rajidae -- Skates
- Regalecidae -- Oarfishes
- Retropinnidae -- New Zealand Smelts
- Rhamphichthyidae -- Sand Knifefishes
- Rhamphocottidae -- Grunt Sculpins
- Rhincodontidae -- Whale Shark, Whale sharks
- Rhiniodontidae
- Rhinobatidae -- Guitarfish, Guitarfishes
- Rhinochimaeridae -- Longnose Chimaeras
- Rhinoprenidae
- Rhinopteridae
- Rhyacichthyidae -- Loach Gobies
- Rhynchobatidae
- Rivulidae -- Rivulines
- Rondeletiidae -- Redmouth Whalefishes
- Saccopharyngidae -- Swallowers
- Salangidae -- Icefishes or Noodlefishes, Icefishes
- Salmonidae -- Salmonids
- Samaridae
- Scaridae -- Parrotfishes
- Scatophagidae -- Scats
- Schilbeidae -- Schilbid Catfishes
- Schilbidae
- Schindleriidae
- Sciaenidae -- Drums or Croakers, Drums, Weakfishes
- Scoloplacidae -- Spiny Dwarf Catfishes
- Scomberesocidae -- Sauries
- Scombridae -- Mackerels, Tunas, Bonitos
- Scombrolabracidae
- Scombropidae -- Gnomefishes
- Scopelarchidae -- Pearleyes
- Scopelosauridae
- Scophthalmidae -- Turbots
- Scorpaenidae -- Scorpionfishes or Rockfishes, Scorpionfishes
- Scorpididae
- Scyliorhinidae -- Cat Sharks, Cat sharks
- Scytalinidae -- Graveldivers
- Searsidae
- Sebastidae -- Rockfishes, Rockcods, Thornyheads
- Serranidae -- Sea Basses, Groupers and Fairy basslets, Sea basses, Groupers, Sand perches
- Serrasalmidae
- Serrivomeridae -- Sawtooth Eels
- Setarchidae
- Siganidae -- Rabbitfishes
- Sillaginidae -- Smelt-whitings
- Siluridae -- Sheatfishes
- Simenchelyidae
- Sisoridae -- Sisorid Catfishes
- Soleidae -- Soles
- Solenostomidae -- Ghost Pipefishes
- Sparidae -- Porgies
- Sphyraenidae -- Barracudas
- Sphyrnidae -- Hammerhead Sharks, Bonnethead Sharks, Scoopheads Sharks, Scoophead sharks
- Squalidae -- Dogfish Sharks, Dogfish sharks
- Squatinidae -- Angel Sharks, Angel sharks
- Stegostomatidae -- Zebra Sharks
- Steindachneriidae
- Stephanoberycidae -- Priklefishes
- Sternoptychidae
- Sternopygidae -- Glass Knifefishes
- Stichaeidae -- Pricklebacks
- Stomiidae -- Barbeled Dragonfishes
- Stromateidae -- Butterfishes
- Stylephoridae -- Tube-eye or Thread-tail, Tube-eyes, Thread-tails
- Sundasalangidae -- Sundaland Noodlefishes
- Symphysanodontidae
- Synanceiidae -- Stonefishes
- Synaphobranchidae -- Cutthroat Eels
- Synbranchidae -- Swamp-eels, Amphipnoidae
- Syngnathidae -- Pipefishes, Seahorses
- Synodontidae -- Lizardfishes
- Telmatherinidae -- Sailfin Silversides
- Teraponidae
- Terapontidae -- Grunters or Tigerperches, Grunters
- Tetrabrachiidae
- Tetragonuridae -- Squaretails
- Tetraodontidae -- Puffers, Pufferfishes
- Tetrarogidae -- Wasp Fishes
- Thaumatichthyidae -- Wolftrap Anglers
- Torpedinidae -- Electric Rays, Torpedo rays
- Toxotidae -- Archerfishes
- Trachichthyidae -- Slimeheads
- Trachinidae -- Weaverfishes
- Trachipteridae -- Ribbonfishes
- Triacanthidae -- Triplespines
- Triacanthodidae -- Spikefishes
- Triakidae -- Houndsharks, Smoothhound sharks
- Trichiuridae -- Cutlassfishes, Hairtails
- Trichodontidae -- Sandfishes
- Trichomycteridae -- Pencil or Parasitic Catfishes, Pencil catfishes, Parasitic catfishes
- Trichonotidae -- Sanddivers
- Triglidae -- Searobins
- Triodontidae -- Three-toothed Puffer
- Tripterygiidae -- Threefin Blennies, Triplefins
- Trypauchenidae
- Umbridae -- Mudminnows
- Uncertain -- Seabasses
- Uranoscopidae -- Stargazers, Stargarzers
- Urolophidae -- Round Rays
- Urotrygonidae -- Round rays
- Valenciidae
- Veliferidae -- Velifers
- Xenisthmidae
- Xenocephalidae
- Xenocongridae
- Xiphiidae -- Swordfish, Spearfishes
- Zanclidae -- Moorish Idol, Moorish idols
- Zaniolepidae
- Zaniolepididae
- Zaproridae -- Prowfish
- Zeidae -- Dories
- Zenionidae -- Zeniontids
- Zoarcidae -- Eelpouts
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