Ab-Am

• Abyssocottidae
  Abyssocottidae
  The deep-water sculpins are a small family, Abyssocottidae, of sculpins that are almost entirely restricted to Lake Baikal in Siberia, most of them living at depths below 170 m....
  
  
• Acanthuridae
  Acanthuridae
  Acanthuridae is the family of surgeonfishes, tangs, and unicornfishes. The family includes about 80 species in six genera, all of which are marine fish living in tropical seas, usually around coral reefs...
  
  
• Acestrorhynchidae
• Achiridae
• Achiropsettidae
• Acipenseridae
• Acropomatidae
  Acropomatidae
  Acropomatidae, also known as the lanternbellies or the temperate ocean-basses, is a family of perciform fish consisting of 33 marine species. Members of Acropoma are notable for having light-emitting organs alongside their undersides...
  
  
• Adrianichthyidae
• Ageneiosidae
• Agonidae
• Akysidae
• Albulidae
• Alepisauridae
• Alepocephalidae
  Alepocephalidae
  Slickheads or nakedheads are a family, Alepocephalidae, of osmeriform fishes. They are deep-water fishes most common below 1,000 m...
  
  
• Alestiidae
  Alestiidae
  African tetras are a group of Characiformes fish exclusively found in Africa. This family contains about 18 genera and 110 species....
  
  
• Alopiidae
• Amarsipidae
• Ambassidae
  Ambassidae
  The Asiatic glassfishes are a family, Ambassidae, of freshwater and marine fishes in the order Perciformes. The species in the family are native to the waters of Asia and Oceania and the Indian and western Pacific Oceans. The family includes eight genera and about fifty species.The family was...
  
  
• Amblycipitidae
  Amblycipitidae
  Amblycipitidae is a family of catfishes, commonly known as torrent catfishes. It includes three genera, Amblyceps, Liobagrus, and Xiurenbagrus.-Taxonomy:...
  
  
• Amblyopsidae
• Amiidae
  Amiidae
  Amiidae is a family of primitive ray-finned fish. Only one species, Amia calva, the bowfin, survives today, although additional species in all four subfamilies are known from Jurassic, Cretaceous, and Eocene fossils....
  
  
• Ammodytidae
• Amphiliidae

An-Ap

• Anabantidae
• Anablepidae
  Anablepidae
  Anablepidae is a family of freshwater and brackish water fishes living on river estuaries from southern Mexico to southern South America. There are three genera with sixteen species: the four-eyed fishes , the onesided livebearers and the white-eye, Oxyzygonectes dovii...
  
  
• Anacanthobatidae
• Anarhichadidae
  Anarhichadidae
  The wolffish are a family, Anarhichadidae, of perciform fish. They are native to cold waters of the northern Atlantic and Pacific Oceans, where they live on the continental shelf and slope, to depths of about . They are bottom-feeders, eating hard-shelled invertebrates such as clams, echinoderms...
  
  
• Anguillidae
  Anguillidae
  Anguillidae is a family of fishes that contains the freshwater eels. There are 19 species/subspecies in this family, all in genus Anguilla. They are catadromous, meaning they spend their lives in freshwater rivers, lakes, or estuaries and return to the ocean to spawn...
  
  
• Anomalopidae
• Anoplogastridae
• Anoplopomatidae
  Anoplopomatidae
  The sablefishes are a family, Anoplopomatidae, of scorpaeniform fishes. They are found in coastal waters of the north Pacific from Japan to California, where they live near the sea floor in deep water: the sablefish, Anoplopoma fimbria, has been found down to . They are large fish, with the...
  
  
• Anostomidae
  Anostomidae
  The Anostomidae are a family of ray-finned fishes that belong to the order Characiformes. Closely related to the Chilodontidae and formerly included with them, the Anostomidae contain over 140 described species...
  
  
• Anotopteridae
• Antennariidae
• Aphredoderidae
• Aphyonidae
  Aphyonidae
  Aphyonidae is a family of eel-like fishes in the order Ophidiiformes. They are found in tropical and subtropical waters throughout the world. They are deep-sea fishes, living between and depth.-Description and biology:...
  
  
• Apistidae
  Apistidae
  Apistidae is a family of fish that includes the waspfishes. They are 19 – 20 cm in length.-Species:* Genus Apistops** Short-armed Waspfish, Apistops caloundra * Genus Apistus...
  
  
• Aploactinidae
• Aplocheilidae
  Aplocheilidae
  Aplocheilidae are a family of bony fishes containing about 15 species. Formerly, the name "Aplocheilidae" was used for the Aplocheiloidei as a whole, i.e. including the Nothobranchiidae of Africa and the mainly South American Rivulidae as subfamilies. This obsolete system is sometimes still seen,...
  
  
• Aplodactylidae
  Aplodactylidae
  Marblefishes are a family, Aplodactylidae, of perciform fishes. They are native to southern Australia, New Zealand, Peru and Chile.-Species:There are six species in two genera:* Genus Aplodactylus** Aplodactylus arctidens Richardson, 1839....
  
  
• Apogonidae
  Apogonidae
  Cardinalfishes are a family, Apogonidae, of ray-finned fishes. They are found in the Atlantic, Indian, and Pacific oceans, they are chiefly marine, but some species are found in brackish water...
  
  
• Apteronotidae

Ar-Au

• Argentinidae
• Ariidae
  Ariidae
  The Ariidae or ariid catfish are a family of catfish that mainly live in marine waters with many freshwater and brackish water species. They are found worldwide in tropical to warm temperate zones.-Taxonomy:...
  
  
• Ariommatidae
  Ariommatidae
  Ariommatidae is a family of perciform fishes. The family contains a single genus Ariomma.- Species :There are 10 species in a single genus:* Genus Ariomma** Ariomma bondi Fowler, 1930.** Ariomma brevimanus ....
  
  
• Arripidae
• Artedidraconidae
  Artedidraconidae
  Artedidraconidae is a family of marine perciform fishes comprising four genera. Artedidraconidae are endemic to deep waters off Antarctica. The operculum carries a hook-shaped spine and there are four or five hypurals. Artedidraconidae have 33 to 41 vertebrae...
  
  
• Aspredinidae
  Aspredinidae
  The Aspredinidae are a small South American family of catfishes also known as the banjo catfishes.-Distribution:Aspredinids are found throughout the major tropical rivers of South America...
  
  
• Astroblepidae
• Ateleopodidae
• Atherinidae
• Atherinopsidae
• Auchenipteridae
• Aulopidae
  Aulopidae
  The Aulopidae are a small family of aulopiform fish, containing the single genus Aulopus. They are found in most tropical and subtropical oceans, being absent only in the eastern Pacific and commonly known as flagfins....
  
  
• Aulorhynchidae
• Aulostomidae
  Aulostomidae
  The family Aulostomidae is a monogeneric family of highly specialized, tubularly-elongated marine fishes commonly known as trumpetfishes. Aulostomids belong to the order Syngnathiformes, along with the seahorses and the similarly built cornetfishes...
  
  

B

• Bagridae
  Bagridae
  Bagridae are a family of catfish that originate from Africa and Asia from Japan to Borneo. These fish are commonly known as naked catfishes or bagrid catfishes.Large Bagrids are important as food fish. Some species are kept as aquarium fishes....
  
  
• Balistidae
• Balitoridae
• Banjosidae
• Barbourisiidae
• Bathyclupeidae
• Bathydraconidae
  Bathydraconidae
  The Antarctic dragonfishes are a family, Bathydraconidae, of deep-sea perciform fishes.They are benthopelagic fishes found in Antarctic waters...
  
  
• Bathylagidae
• Bathylutichthyidae
• Bathymasteridae
• Batrachoididae
• Bedotiidae
  Bedotiidae
  Bedotiidae is a family of fish known as the Madagascar rainbowfish, Madagascan rainbowfish, or Malagasy rainbowfish due to their endemism to Madagascar. It includes two genera, Bedotia and Rheocles.-Anatomy and morphology:...
  
  
• Belonidae
• Belontiidae
• Bembridae
  Bembridae
  The Deep-water flatheads are a family, the Bembridae, of bottom-dwelling fish. They are thought to be more primitive than their close relatives, the true flatheads...
  
  
• Berycidae
  Berycidae
  The Berycidae is a small family of deep sea fishes, related to the squirrelfishes. The family includes the alfonsinos and the nannygais.Berycids are found in both temperate and tropical waters around the world, between in depth, though mainly greater than . They are typically red in colour, and...
  
  
• Blenniidae
• Bothidae
  Bothidae
  Lefteye flounders are a family, Bothidae, of flounders. They are called "lefteye flounders" because most species lie on the sea bottom on their right side, with both eyes on the left side...
  
  
• Bovichtidae
• Brachaeluridae
  Brachaeluridae
  The Brachaeluridae, or blind sharks, are a small family of sharks in the order Orectolobiformes. There are only two species of blind shark, both of which are native to shallow coastal waters up to depth, off the eastern coast of Australia....
  
  
• Brachionichthyidae
• Bramidae
• Bregmacerotidae
• Bythitidae

Ca

• Caesionidae
  Caesionidae
  The fusilier fishes are a family, Caesionidae, of fishes in the order Perciformes. They are related to the snappers, but adapted for feeding on plankton, rather than on larger prey.They are cylindrical, streamlined fishes, of up to in length...
  
  
• Callanthiidae
• Callichthyidae
  Callichthyidae
  Callichthyidae is a family of catfishes , called armored catfishes due to the two rows of bony plates running down the length of the body. This family contains some of the most popular freshwater aquarium fish, such as the Corydoras.-Taxonomy:The family derives its name from the Greek words kallis...
  
  
• Callionymidae
• Callorhinchidae
• Caproidae
  Caproidae
  Boarfishes are a small family, Caproidae, of marine fishes comprising two genera and twelve species. They are usually placed in the order Zeiformes with the dories, but this placement is uncertain, since boarfishes have many perciform characters, for instance in the caudal skeleton...
  
  
• Caracanthidae
  Caracanthidae
  The coral crouchers, or orbicular velvetfishes, are a family, the Caracanthidae, of Scorpaeniform fishes. They live in coral reefs of the tropical Indo-Pacific. Only four species are known....
  
  
• Carangidae
  Carangidae
  Carangidae is a family of fish which includes the jacks, pompanos, jack mackerels, and scads.They are marine fish found in the Atlantic, Indian and Pacific Oceans...
  
  
• Carapidae
• Carcharhinidae
• Caristiidae
• Catostomidae
  Catostomidae
  Catostomidae is the sucker family of the order Cypriniformes. There are 80 species in this family of freshwater fishes. Catostomidae are found in North America, east central China, and eastern Siberia...
  
  
• Caulophrynidae

Ce

• Centracanthidae
  Centracanthidae
  Centracanthidae is a small family of fishes in the order Perciformes, known as picarels. They are found in the eastern Atlantic Ocean and Mediterranean. The anal fin has three sharp spines, hence the name, from Greek kentron meaning "sharp point" and akantha meaning "thorn"...
  
  
• Centrarchidae
  Centrarchidae
  The sunfishes are a family of freshwater ray-finned fish belonging to the order Perciformes. The type genus is Centrarchus . The family's 27 species includes many fishes familiar to North Americans, including the rock bass, largemouth bass, bluegill, pumpkinseed, and crappies...
  
  
• Centriscidae
  Centriscidae
  Centriscidae is the family of snipefishes, shrimpfishes, and bellowfishes. A small family, consisting of only about a dozen marine species, they are of an unusual appearance, as reflected by the common names...
  
  
• Centrogenyidae
• Centrolophidae
• Centrophoridae
  Centrophoridae
  Centrophoridae are a family of squaliform sharks. The family contains just two genera and approximately 15 species. They are sometimes called gulper sharks but this is also the name of a specific species in the family, Centrophorus granulosus....
  
  
• Centrophrynidae
• Centropomidae
  Centropomidae
  The Centropomidae are a single genus family of freshwater and marine fishes in Order Perciformes, including the common snook or róbalo, Centropomus undecimalis...
  
  
• Cepolidae
• Ceratiidae
  Ceratiidae
  Sea devils are a family of deep-sea anglerfish otherwise known as Ceratiidae from the Greek keras, "horn", referring to the bioluminescent lure that projects from the fishes' forehead....
  
  
• Ceratodontidae
• Cetomimidae
• Cetopsidae
  Cetopsidae
  Cetopsidae is a small family of catfishes , commonly called the whale catfishes.-Taxonomy:This family contains five genera. It is divided into two subfamilies, Cetopsinae and Helogeneinae. Helogeneinae was previously a family-level group, but now it has been reclassified as a subfamily of Cetopsidae...
  
  
• Cetorhinidae

Ch

• Chacidae
• Chaenopsidae
  Chaenopsidae
  The blennioid family Chaenopsidae includes the pike-blennies, tube-blennies and flagblennies: all perciform marine fish. The family is strictly tropical, ranging from North to South America...
  
  
• Chaetodontidae
• Champsodontidae
• Chanidae
• Channichthyidae
  Channichthyidae
  The crocodile icefish or white-blooded fish are a family of perciform fish found in the cold waters around Antarctica and southern South America. Water temperature can drop below 0°C in the Antarctic sea but stays rather constant. There are sixteen known species of crocodile icefish...
  
  
• Channidae
  Channidae
  The Snakeheads are members of the freshwater perciform fish family Channidae, native to Africa and Asia. These elongated predatory fish are distinguished by a long dorsal fin, large mouth and shiny teeth. They breathe air with a suprabranchial organ, a primitive form of a labyrinth organ...
  
  
• Characidae
  Characidae
  The Characidae, characids or characins are a family of freshwater subtropical and tropical fish, belonging to the order Characiformes. The name "characins" is the historical one, but scientists today tend to prefer "characids" to reflect their status as a by and large monophyletic group at family...
  
  
• Chaudhuriidae
• Chaunacidae
• Cheilodactylidae
• Chiasmodontidae
  Chiasmodontidae
  Chiasmodontidae, the snaketooth fishes, is a family of deep-sea fishes in the order Perciformes.-Species:There are 22 species in four genera:* Genus Chiasmodon Johnson, 1864 ** Chiasmodon bolangeri Osório, 1909....
  
  
• Chilodontidae
• Chimaeridae
  Chimaeridae
  The Chimaeridae, or shortnose chimaeras are a family of cartilaginous fish.They resemble other chimaeras in general form and habits, but have a short, rounded, snout, without the modifications found in related families. Many species have a long tapering tail, given them an alternative name of ratfish...
  
  
• Chirocentridae
• Chironemidae
• Chlamydoselachidae
• Chlopsidae
  Chlopsidae
  The Chlopsidae, or false morays, are a family of eels found in coral reefs worldwide. As their name suggests, they somewhat resemble moray eels in appearance...
  
  
• Chlorophthalmidae

Ci-Cu

• Cichlidae
• Cirrhitidae
• Citharidae
  Citharidae
  The Citharidae are a small family of flounders. They are found in the Mediterranean Sea, the Indian Ocean and the western Pacific from Japan to Australia.Species reach lengths ranging between14 to 36 cm.-Species:* Genus Brachypleura...
  
  
• Citharinidae
  Citharinidae
  Citharinidae is a small family of characiform fish. They are fresh-water fish native to Africa, and are sufficiently abundant to be a significant food fish.They are deep-bodied, silvery fish, measuring up to in length and weighing up to...
  
  
• Clariidae
• Clinidae
• Clupeidae
  Clupeidae
  Clupeidae is the family of the herrings, shads, sardines, hilsa and menhadens. It includes many of the most important food fishes in the world.-Description and biology:...
  
  
• Cobitidae
• Coiidae
  Coiidae
  Coiidae is a family of fish. Their taxonomic position is disputed: they are related to the Lobotidae and the Datnioides and were once considered synonymous with the latter, and may be the same as the Anabas....
  
  
• Colocongridae
  Colocongridae
  The Colocongridae, the Worm eels or Short-tail eels are a family of eels, containing a single genus, Coloconger.Colongrids are found in tropical waters of the Atlantic, Indian, and West Pacific oceans. They are bottom-dwelling fish, living in waters from to depth...
  
  
• Comephoridae
• Congiopodidae
  Congiopodidae
  Congiopodidae is a family of scorpaeniform fishes native to the southern hemisphere, commonly known as pigfishes, horsefishes and racehorses.Congiopids live on the bottom of shallow temperate and sub-Antarctic seas, at depths of up to...
  
  
• Congridae
  Congridae
  Congridae is the family of conger and garden eels. Congers are valuable and often large food fishes, while garden eels live in colonies, all protruding from the sea floor after the manner of plants in a garden...
  
  
• Coryphaenidae
  Coryphaenidae
  The Coryphaenidae are a family of marine ray-finned fish belonging to the Order Perciformes. The family contains only one genus, Coryphaena, which contains two species, both of which have compressed heads and single dorsal fins that run the entire length of the fish's bodies...
  
  
• Cottidae
  Cottidae
  The Cottidae is a family of demersal fish in the order Scorpaeniformes, suborder Cottoidei . There are about 300 species in 70 genera of Cottidae that are mostly marine and found in shallow coastal waters in the northern and arctic regions...
  
  
• Cottocomephoridae
• Cranoglanididae
• Creediidae
• Crenuchidae
  Crenuchidae
  Crenuchidae is a family of fresh water fish of the order Characiformes. There are twelve genera including about 74 species, though there are several undescribed species...
  
  
• Cryptacanthodidae
  Cryptacanthodidae
  Cryptacanthodidae is a family of fish containing a single genus, Cryptacanthodes. There are four species in the genus Cryptacanthodes. This family is also known by the common names risueños, terrassiers and wrymouths.-External links:*...
  
  
• Ctenoluciidae
  Ctenoluciidae
  Ctenoluciidae , also known as pike-characins, is a small family of freshwater fishes from Panama and South America.They have elongate, pike-like bodies, and several sharp and conical teeth...
  
  
• Curimatidae
  Curimatidae
  Curimatidae is a family of freshwater fishes, known as the toothless characins of the order Characiformes. They originate from southern Costa Rica to northern Argentina. The family has around 95 species, many of them frequently exploited for human consumption...
  
  

Cy

• Cyclopteridae
• Cyematidae
• Cynodontidae
  Cynodontidae
  Cynodontidae fishes , or dogteeth tetras, are a family of freshwater fishes found in the Neotropics. This group is not very diverse, and includes only five genera and 14 species. Most of what is known about this family is from the members of the subfamily Cynodontinae, which includes the largest...
  
  
• Cynoglossidae
• Cyprinidae
• Cyprinodontidae

D

• Dactylopteridae
  Dactylopteridae
  The flying gurnards are a family, Dactylopteridae, of marine fish notable for their greatly enlarged pectoral fins. As they cannot literally fly, an alternative name preferred by some authors is helmet gurnards...
  
  
• Dactyloscopidae
• Dalatiidae
  Dalatiidae
  Dalatiidae is a family of sharks in the order Squaliformes, commonly known as kitefin sharks . Members of this family are small, under long, and are found worldwide. They have cigar-shaped bodies with narrow heads and rounded snouts...
  
  
• Dasyatidae
• Dentatherinidae
• Denticipitidae
• Derichthyidae
• Diceratiidae
• Dichistiidae
• Dinolestidae
• Dinopercidae
  Dinopercidae
  Dinopercidae, also known as the cavebasses, is a family of marine perciform fish consisting of a single species, Dinoperca petersi, which is native to the Indian Ocean and the Atlantic Ocean off the coast of Angola....
  
  
• Diodontidae
• Diplomystidae
• Diretmidae
• Doradidae
  Doradidae
  Doradidae is a family of catfishes also known as thorny catfishes or talking catfishes. These fish are native to South America, primarily in Brazil, Peru, and the Guianas.Doradids are omnivorous.-Taxonomy:...
  
  
• Draconettidae
  Draconettidae
  Draconettidae, the slope dragonets, is a small family of fish in the order Perciformes. They are found in temperate to tropical waters of the Atlantic, Indian and western Pacific Oceans. They are closely related to, and appear similar to, the fish of the Callionymidae. They are small fish, the...
  
  
• Drepaneidae
  Drepaneidae
  The sicklefishes are perciform fishes of the genus Drepane, the only genus in the family Drepaneidae. They are found in the Indian and western Pacific Oceans, and in the eastern Atlantic near Africa...
  
  

E

• Echeneidae
• Echinorhinidae
• Elassomatidae
• Electrophoridae
• Eleginopidae
  Eleginopidae
  Eleginops maclovinus, commonly known as the Patagonian blenny, Falkland's mullet or rock cod, is a species of icefish found in coastal and estuarine habitats around southernmost South America, ranging as far north as Valparaíso on the Pacific side, and Uruguay on the Atlantic side. It is also found...
  
  
• Eleotridae
  Eleotridae
  Sleeper gobies are members of the Eleotridae fish family, found predominantly in the tropical Indo-Pacific. There are approximately 35 genera and 150 species. While many eleotrids pass through a planktonic stage in the sea and some spend their entire lives in the sea, as adults the majority live in...
  
  
• Elopidae
  Elopidae
  Elopidae is a family of ray-finned fish containing the single genus Elops. They are commonly known as ladyfishes, skipjacks, Jack-Rashes, or tenpounders....
  
  
• Embiotocidae
  Embiotocidae
  The surfperches are a family, Embiotocidae, of perciform fishes. They are found in coastal waters of the northern Pacific and grow up to 45 cm long....
  
  
• Emmelichthyidae
  Emmelichthyidae
  Rovers are a family of small to medium sized marine fish. The family was once much larger, including a wide range of plankton-eating fish, but most of the genera were discovered to be unrelated examples of parallel evolution, and were moved to other families....
  
  
• Engraulidae
• Enoplosidae
• Ephippidae
  Ephippidae
  Ephippidae is the fish family containing the spadefishes. There are about eight genera, with a total of 20 species, mostly marine. The most well-known species are probably those in the reef-dwelling genus Platax, the batfishes, which are kept as aquarium fish. They are spade-shaped, laterally...
  
  
• Epigonidae
• Erethistidae
  Erethistidae
  Erethistidae are a family of catfishes that originate from southern Asia.-Taxonomy:This family includes species previously placed in Sisoridae. They were removed because they were thought to be more closely related to the neotropical Aspredinidae than to the remaining sisorids due to a number of...
  
  
• Ereuniidae
  Ereuniidae
  Ereuniidae is a family of scorpaeniform fishes. They are native to deep marine waters around Japan. The lower four rays of the pectoral fin are elongated and free.-Species:There are three species in two genera:* Genus Ereunias...
  
  
• Erythrinidae
  Erythrinidae
  The Erythrinidae are a family of freshwater fish found in rivers from Costa Rica south as far as Argentina. They are common and are usually caught with hooks by fishermen, partially because of their voracious behaviour....
  
  
• Esocidae
• Euclichthyidae
• Eurypharyngidae
• Evermannellidae
• Exocoetidae

Ga-Gr

• Gadidae
  Gadidae
  Gadidae is a family of marine fish, included in the order Gadiformes. It includes the cod, haddock, whiting, and pollock.Most species of gadid are found in temperate waters of the northern hemisphere, although there are some exceptions. They are generally medium sized fish, and are distinguished...
  
  
• Galaxiidae
• Gasteropelecidae
• Gasterosteidae
• Gempylidae
• Geotriidae
  Geotriidae
  Geotriidae, also known as Southern Lampreys, are type of living, vertebrata fish. This fish also holds an IUCN Red List status of "Not Evaluated"-References:*http://www.eol.org/pages/4539624*http://www.discoverlife.org/mp/20q?search=Geotriidae...
  
  
• Gerreidae
• Gibberichthyidae
  Gibberichthyidae
  Gibberichthyidae, also known as Gibberfishes, are a type of living, vertebrata fish. This fish carries an IUCN Red List status of "Not Evaluated".-References:*http://www.discoverlife.org/mp/20q?search=Gibberichthyidae*http://www.eol.org/pages/5082...
  
  
• Gigantactinidae
• Giganturidae
• Ginglymostomatidae
• Glaucosomatidae
• Gnathanacanthidae
• Gobiesocidae
  Gobiesocidae
  Clingfishes are fishes of the family Gobiesocidae. Most species are marine, being found in shallow waters of the Atlantic, Pacific and Indian Oceans. They are bottom-dwelling fishes; some species shelter in sea urchins or crinoids.-Description:...
  
  
• Gobiidae
• Gonorynchidae
• Gonostomatidae
  Gonostomatidae
  Gonostomatidae is a family of deep-water marine fish, commonly named bristlemouths, lightfishes or anglemouths. It is a relatively small family, containing only eight known genera and 32 species...
  
  
• Goodeidae
  Goodeidae
  Splitfins, are a family, Goodeidae, of teleost fish endemic to Mexico and some areas of the United States. This family contains 40 species within 18 genera. The family is named after ichthyologist George Brown Goode.-Range and Geographic Distribution:...
  
  
• Grammatidae
• Grammicolepididae

Ha-Ho

• Haemulidae
  Haemulidae
  The grunts are a family, Haemulidae, of fishes in the order Perciformes. They are numerous and widespread, with about 150 species in 19 genera, found in tropical fresh, brackish and salt waters around the world...
  
  
• Halosauridae
• Harpagiferidae
  Harpagiferidae
  Harpagiferidae, also known as Spiny Plunderfishes, are a type of living, vertebrata fish. This fish carries an IUCN Red List status of "Not Evaluated".-References:*http://www.discoverlife.org/mp/20q?search=Harpagiferidae*http://www.eol.org/pages/5315...
  
  
• Helogeneidae
• Helostomatidae
• Hemigaleidae
  Hemigaleidae
  The weasel sharks are a family, Hemigaleidae, of ground sharks found from the eastern Atlantic Ocean to the continental Indo-Pacific. They are found in shallow coastal waters to a depth of 100 m ....
  
  
• Hemiodontidae
  Hemiodontidae
  The Hemidontidae is a small family of freshwater characins found in northern South America, south to the Paraná-Paraguay Basin. The larger species are popular food fish....
  
  
• Hemiramphidae
• Hemiscylliidae
  Hemiscylliidae
  Hemiscylliidae is a family of sharks in the order Orectolobiformes, commonly known as longtail carpet sharks or bamboo sharks. They are found in shallow waters of the tropical Indo-Pacific....
  
  
• Hemitripteridae
• Hepsetidae
• Heptapteridae
  Heptapteridae
  Heptapteridae is a family of catfish that originate from Mexico to South America. Heptapteridae is derived from Greek, hepta meaning seven and pteron meaning fin....
  
  
• Heterenchelyidae
  Heterenchelyidae
  The Heterenchelyidae or Mud eels are a small family of eels native to the Atlantic, Mediterranean, and eastern Pacific.Heterenchelyids are bottom-dwelling fish adapted to burrowing into soft mud. They have large mouths and no pectoral fins, and range from to in length. There are currently eight...
  
  
• Heterodontidae
• Heteropneustidae
• Hexagrammidae
  Hexagrammidae
  The family of marine fishes Hexagrammidae incorporates the greenlings. These fish are found on the continental shelf in the temperate or subarctic waters of the North Pacific. They are a well-known family in the littoral zone from southern California north to the Aleutian Islands...
  
  
• Hexanchidae
• Hexatrygonidae
• Himantolophidae
• Hiodontidae
• Hispidoberycidae
• Holocentridae
  Holocentridae
  The Holocentridae is a family of ray-finned fish, belonging to the order Beryciformes with the members of the subfamily Holocentrinae typically known as squirrelfish, while the members of Myripristinae typically are known as soldierfish...
  
  
• Hoplichthyidae

I

• Icosteidae
• Ictaluridae
  Ictaluridae
  The Ictaluridae, sometimes called Ictalurids, are a family of catfish native to North America, where they are important food fish and sometimes as a sport fish. They include fish commonly known as bullheads, madtoms, channel catfish, and blue catfish....
  
  
• Indostomidae
• Inermiidae
• Ipnopidae
  Ipnopidae
  Ipnopidae is a family of fishes in the order Aulopiformes. They are small slender fishes, with maximum length ranging from about to about . They are found in temperate and tropical deep waters of the Atlantic, Indian and Pacific Oceans.A number of species, especially in the genus Bathypterois...
  
  
• Istiophoridae

La-Li

• Labridae
• Labrisomidae
• Lactariidae
• Lamnidae
  Lamnidae
  Lamnidae is a family of sharks, commonly known as mackerel sharks or white sharks. They are large, fast-swimming sharks, found in oceans worldwide....
  
  
• Lampridae
• Latimeriidae
• Latridae
  Latridae
  Trumpeters are a family of perciform fishes, Latridae. They are found in southern waters off Australia, New Zealand, and Chile, where they are fished commercially and for sport...
  
  
• Lebiasinidae
  Lebiasinidae
  The Lebiasinidae , are a family of freshwater fishes found in Costa Rica, Panama, and South America. They are usually small and are known as ornamental fishes in aquaria, including popular fishes such as the pencil fish and splashing tetra.Lebiasinids are small, cylindrical fish, ranging from to ...
  
  
• Leiognathidae
• Lepidogalaxiidae
• Lepidosirenidae
• Lepisosteidae
• Leptobramidae
• Leptochariidae
• Leptochilichthyidae
• Leptoscopidae
• Lethrinidae
  Lethrinidae
  The emperor breams or simply emperors also known as pigface breams are a family, Lethrinidae, of fishes in the order Perciformes....
  
  
• Linophrynidae
• Liparidae

Lo-Lu

• Lobotidae
• Lophichthyidae
• Lophiidae
• Lophotidae
• Loricariidae
  Loricariidae
  Loricariidae is the largest family of catfish , with almost 700 species and new species being described each year. Loricariids originate from fresh water habitats of Costa Rica, Panama, and tropical and subtropical South America. These fish are noted for the bony plates covering their bodies and...
  
  
• Lotidae
  Lotidae
  Lotidae is a family of cod-like fishes commonly known as lings or rocklings.They are found in the Arctic, Atlantic and Pacific Oceans...
  
  
• Luciocephalidae
  Luciocephalidae
  Luciocephalus pulcher is an endangered species of fish. As the prey is swallowed, the extended jaw is folded back into place. The fish is restricted locally to a few forest streams....
  
  
• Lutjanidae
  Lutjanidae
  Snappers are a family of perciform fish, mainly marine but with some members inhabiting estuaries, feeding in freshwater. Some are important food fish. One of the best known is the red snapper....
  
  
• Luvaridae

Ma-Mi

• Macrouridae
• Malacanthidae
• Malapteruridae
• Mastacembelidae
  Mastacembelidae
  The Mastacembelidae are a family of fishes, known as the spiny eels. The Mastacembelids are part of the Order Synbranchiformes, the swamp eels, which are part of the Actinopterygii ....
  
  
• Megachasmidae
• Megalomycteridae
• Megalopidae
• Melamphaidae
• Melanocetidae
• Melanonidae
  Melanonidae
  Melanonidae is a family containing just two species of cod-like marine fishes.Both species are small fish, no more than in length, and are black in colour...
  
  
• Melanotaeniidae
• Menidae
• Merlucciidae
  Merlucciidae
  Merlucciidae is a family of cod-like fish, including most hakes.They are native to the Atlantic and Pacific oceans, being common in southern waters off Tasmania and New Zealand....
  
  
• Microdesmidae
• Microstomatidae
  Microstomatidae
  Microstomatidae is a family of osmeriform fishes.They are native to the Atlantic, Indian and Pacific Oceans.- Species :There are twenty species in three genera:* Genus Microstoma** Slender argentine, Microstoma microstoma ....
  
  
• Mirapinnidae
• Mitsukurinidae
  Mitsukurinidae
  Mitsukurinidae, also called goblin sharks is a family of sharks with one living genus, Mitsukurina, and three extinct genera: Anomotodon, Pseudoscapanorhynchus and Scapanorhynchus, though some taxonomists consider Scapanorhynchus to be a synonym of Mitsukurina...
  
  

• Metalfish
• Mochokidae
  Mochokidae
  The Mochokidae are a family of catfishes that are known as the squeakers and upside-down catfish. There are 10 genera and about 188 species of mochokids. All the mochokids are freshwater species originating from Africa....
  
  
• Molidae
  Molidae
  Molidae is the family of the molas or ocean sunfishes, unique fish whose bodies come to an end just behind the dorsal and anal fins, giving them a "half-a-fish" appearance...
  
  
• Monacanthidae
• Monocentridae
  Monocentridae
  Pinecone fishes are small and unusual beryciform marine fish of the family Monocentridae. The family contains just four species in two genera, one of which is monotypic. Their distribution is limited to tropical and subtropical waters of the Indo-Pacific...
  
  
• Monodactylidae
  Monodactylidae
  The Monodactylidae is a family of fish within the Perciformes commonly referred to as monos, moonyfishes or fingerfishes. All are strongly laterally compressed with an approximately disc-shaped body and tall anal and dorsal fins. Unusually for fish, there are scales on the dorsal fin and sometimes...
  
  
• Monognathidae
• Moridae
  Moridae
  Moridae is a family of cod-like fishes, known as codlings, hakelings, and moras.Morids are marine fishes found throughout the world, and may be found at depths of up to , although most prefer shallower waters...
  
  
• Moringuidae
  Moringuidae
  The Moringuidae is a small family of eels. They are commonly known as spaghetti eels or worm eels, although the latter name is also shared with other families of eel.Moringuid eels are found in shallow tropical waters worldwide...
  
  
• Mormyridae
  Mormyridae
  The family Mormyridae, sometimes called "elephantfish" , are freshwater fish in the order Osteoglossiformes native to Africa. It is by far the largest family in the order with around 200 species. Members of the family are popular, if challenging, aquarium species...
  
  
• Moronidae
  Moronidae
  Temperate Bass is in the Family PercichthyidaeHow to know the freshwater fishes Samuel Eddy, James C. Underhill.Moronidae, also known as the "temperate basses", is a family of perciform fish consisting of 6 freshwater and marine species...
  
  
• Mugilidae
• Mullidae
• Muraenesocidae
  Muraenesocidae
  The Muraenesocidae, or pike congers, are a small family of marine eels found worldwide in tropical and subtropical seas. Some species are known to enter brackish water....
  
  
• Muraenidae
• Muraenolepididae
  Muraenolepididae
  Muraenolepididae is a family of cod-like fish, known as Eel cods.Muraenolepididae are marine fish found in the Southern Ocean-Species:There are 8 species:* Muraenolepis andriashevi...
  
  
• Myctophidae
• Myliobatidae
• Myrocongridae
  Myrocongridae
  The Myrocongridae or Thin eels are a small family of eels consisting of a single genus, Myroconger. Very little is known about the group....
  
  
• Myxinidae

N

• Nandidae
  Nandidae
  Asian leaffishes are small freshwater fishes of the Nandidae family, from Southern Asia. There are only four genera in this group.These fish usually have small heads, coloration that appears to have evolved to resemble leaves and very large protractile mouths...
  
  
• Narcinidae
  Narcinidae
  The numbfishes are a group of electric rays in the family Narcinidae. They are bottom-dwelling cartilaginous fishes with large, rounded pectoral fin discs and long tails...
  
  
• Nematistiidae
• Nematogenyidae
• Nemichthyidae
• Nemipteridae
• Neoceratiidae
• Neoscopelidae
  Neoscopelidae
  The Neoscopelidae are a small family of deep sea fish closely related to the lanternfish. They are found in tropical and subtropical marine waters worldwide....
  
  
• Neosebastidae
• Nettastomatidae
  Nettastomatidae
  The duckbill eels or witch eels are a family, Nettastomatidae, of eels. The name is from Greek netta meaning "duck" and stoma meaning "mouth"....
  
  
• Nomeidae
• Normanichthyidae
• Notacanthidae
  Notacanthidae
  The deep-sea spiny eels are a family, Notacanthidae, of fishes found worldwide below , and going as deep as .Their bodies of deep sea spiny eels are greatly elongated, though more tapered than in true eels. The caudal fin is small or nonexistent, while the anal fin is lengthy, as long as half of...
  
  
• Notocheiridae
  Notocheiridae
  The surf silversides are a small family, Notocheiridae, of salt water atheriniform fish found in tropical and temperate seas.They are small fish, typically less than in length, with silver stripes and a keel-shaped underside...
  
  
• Notograptidae
• Notopteridae
  Notopteridae
  The family Notopteridae contains eight species of osteoglossiform fishes, commonly known as featherbacks and knifefishes. They are small fishes living in freshwater or brackish environments in Africa and South-east Asia....
  
  
• Notosudidae
  Notosudidae
  Waryfishes are deep-sea aulopiform fishes in the small family Notosudidae. They are thought to have a circumglobal distribution in sub-Arctic to subantarctic waters...
  
  
• Nototheniidae
  Nototheniidae
  The cod icefishes or nothothens are the family Nototheniidae of acanthopterygian fishes, containing about 50 species in 13 genera. They are traditionally placed in the perciform assemblage together with their relatives, but like every lineage in the "Perciformes" their actual relationships are not...
  
  

O

• Odacidae
  Odacidae
  Odacidae is a small family of fishes in the order Perciformes, commonly known as butterfish, cales, and weed-whitings. They are related to the much larger families of the wrasses and parrotfish....
  
  
• Odontaspididae
• Odontobutidae
  Odontobutidae
  Freshwater sleepers is a small family of fishes in the order Perciformes. They are native to fresh water rivers flowing into the South China Sea and the northwestern Pacific Ocean.-Species:There are twenty species in six genera:...
  
  
• Ogcocephalidae
  Ogcocephalidae
  Ogcocephalidae is a family of bottom-dwelling, specially adapted fish. They are sometimes referred to as batfishes or anglerfishes. They are found in deep, lightless waters of the Atlantic, Indian and western Pacific Oceans....
  
  
• Olyridae
• Omosudidae
• Oneirodidae
  Oneirodidae
  The dreamers are a family, Oneirodidae, of deep-sea anglerfishes in the order Lophiiformes. They are the largest and most diverse group of deep-sea anglerfish, and also the least well-known with several genera represented by only one, two, or three female specimens. They are found in deep,...
  
  
• Ophichthidae
  Ophichthidae
  Ophichthidae is a family of eels, comprising species commonly called worm eels and snake eels. The term "Ophichthidae" comes from Greek ophis and ichthys ....
  
  
• Ophidiidae
  Ophidiidae
  The cusk-eels family are a group of marine bony fishes in the order Ophidiiformes. The scientific name is from Greek ophis meaning "snake", and refers to their eel-like appearance...
  
  
• Opisthoproctidae
• Opistognathidae
  Opistognathidae
  Opistognathidae , commonly referred to as jawfishes, are classified within Order Perciformes, Suborder Percoidei. They are found throughout shallow reef areas of the Atlantic and Pacific Oceans, and the Gulf of Mexico.Physically similar to blennies, jawfish are generally smaller-sized fish with an...
  
  
• Oplegnathidae
  Oplegnathidae
  Oplegnathidae is a family of marine fish within the Perciformes commonly known as knifejaws; some species are known as beakfish. It contains a single genus, Oplegnathus. The largest, the Cape knifejaw, can reach a maximum length of about 90 cm . Knifejaws have teeth fused into a parrotlike beak...
  
  
• Orectolobidae
• Oreosomatidae
  Oreosomatidae
  The Oreos are a family, the Oreosomatidae, of marine fish. Most species are found in the southern hemisphere, inhabiting continental slopes down to about depth.- Species :The family is relatively small, containing nine species in four genera:...
  
  
• Osmeridae
• Osphronemidae
• Osteoglossidae
  Arowana
  Arowanas are freshwater bony fish of the family Osteoglossidae, also known as bonytongues. In this family of fishes, the head is bony and the elongate body is covered by large, heavy scales, with a mosaic pattern of canals. The dorsal and the anal fins have soft rays and are long based, while the...
  
  
• Ostraciidae
• Ostracoberycidae

Pa-Pe

• Pangasiidae
• Pantodontidae
• Parabembridae
• Parabrotulidae
• Parakysidae
• Paralepididae
• Paralichthyidae
  Paralichthyidae
  Large-tooth flounders are a family, Paralichthyidae, of flounders. They lie on the sea bed on their right side; both eyes are on the left side of the head, while the Pleuronectidae are the opposite with their eyes on the right side....
  
  
• Parascorpididae
• Parascylliidae
  Parascylliidae
  The Parascylliidae, or collared carpet sharks are a family of sharks. They are only found in shallow waters of the western Pacific.They are relatively small sharks, with the largest species reaching no more than in adult length. They have elongated, slender, bodies, cat-like eyes, and barbels...
  
  
• Paraulopidae
• Parazenidae
• Parodontidae
  Parodontidae
  Parodontidae is a family of fresh water fish of the order Characiformes. There are three genera including about 21 species, though there are several undescribed species. These fish are generally benthic and live in mountain streams of eastern Panama and South America It was formerly considered a...
  
  
• Pataecidae
• Pegasidae
  Pegasidae
  The seamoths are a family, the Pegasidae, of fish found in coastal tropical waters.They are distinguished by flattened bodies, the presence of large, wing-like, pectoral fins, and a body encased in thick, bony plates. Most species also have an elongated snout in front of their jaws...
  
  
• Pempheridae
• Pentacerotidae
• Percichthyidae
• Percidae
  Percidae
  The Percidae are a family of perciform fish found in fresh and brackish waters of the Northern Hemisphere. The family contains about 200 species in ten genera...
  
  
• Perciliidae
• Percophidae
  Percophidae
  Duckbills are a family, Percophidae, of perciform fishes.They are found in tropical and subtropical waters of the Atlantic and Indian Oceans and in the southwestern and southeastern Pacific....
  
  
• Percopsidae
  Percopsidae
  Percopsidae is a family of fish in the order Percopsiformes. Its living members are two North American fresh water species of the genus Percopsis, trout-perch Percopsis omiscomaycus and sand roller Percopsis transmontana .They are small fish with weak fin spines, and an adipose fin similar to...
  
  
• Peristediidae
• Petromyzontidae

Ph-Pl

• Phallostethidae
  Phallostethidae
  The Priapium fishes are a family, Phallostethidae, of atheriniform fish native to South-east Asia.They are small fish, no more than in length, with partially translucent bodies. They are found in fresh and brackish water from Thailand to the Philippines. They are named for a muscular organ found...
  
  
• Pholidae
  Pholidae
  The gunnels are a family, Pholidae, of fishes in the order Perciformes.They are elongated fishes native to the coasts of the northern Atlantic, Pacific and Arctic Oceans, where they inhabit intertidal and subtidal waters and eat crustaceans and molluscs.-Species:There are fifteen species in three...
  
  
• Pholidichthyidae
  Pholidichthyidae
  Pholidichthys is a genus of perciform fish which consists of two species of the tropical Pacific Ocean. It is the only genus in the family Pholidichthyidae.-Species:* Pholidichthys anguis Springer & Larson, 1996...
  
  
• Phosichthyidae
  Phosichthyidae
  Lightfishes are small stomiiform fishes in the family PhosichthyidaeThey are very small fishes found in oceans throughout the world: most species grow no longer than 10 cm, while those in the genus Vinciguerria only reach 4 cm or so....
  
  
• Phractolaemidae
• Phycidae
  Phycidae
  Phycidae is a family of hakes in the order Gadiformes. They are native to the Atlantic Ocean, but the juveniles of some species enter estuaries.Joseph Nelson classifies this family as the subfamily Phycinae of the cod family, Gadidae.-Species:...
  
  
• Pimelodidae
  Pimelodidae
  Pimelodidae, commonly known as the long-whiskered catfishes, is a family of catfishes .-Taxonomy:Pimelodidae has undergone much revision. Currently, the family contains about 30 genera and about 90 recognized and known but unnamed species...
  
  
• Pinguipedidae
• Platycephalidae
  Platycephalidae
  Platycephalidae is a family of marine fishes, most commonly referred to as flatheads. They are relatives of the popular lionfishes, belonging to the order Scorpaeniformes....
  
  
• Platytroctidae
  Platytroctidae
  The tubeshoulders are a family, the Platytroctidae, of marine osmeriform fishes. They are found throughout the world, except for the Mediterranean sea. Tubeshoulders live at moderate depths of to , and some have light-producing organs...
  
  
• Plecoglossidae
• Plectrogenidae
• Plesiobatidae
• Plesiopidae
• Pleuronectidae
  Pleuronectidae
  Righteye flounders are a family, Pleuronectidae, of flounders. They are called "righteye flounders" because most species lie on the sea bottom on their left side, with both eyes on the right side. The Paralichthyidae are the opposite, with their eyes on the left side.Their dorsal and anal fins are...
  
  
• Plotosidae

Po-Pr

• Poeciliidae
  Poeciliidae
  Poeciliidae is a family of fresh-water fish which are live-bearing aquarium fish . They belong to the order Cyprinodontiformes, tooth-carps, and include well-known aquarium fish such as the guppy, molly, platy, and swordtail...
  
  
• Polycentridae
  Polycentridae
  Leaffishes are small freshwater fishes of the Polycentridae family, from South America.They usually have large heads, cryptic colors and very large protractile mouths...
  
  
• Polymixiidae
• Polynemidae
• Polyodontidae
• Polyprionidae
• Polypteridae
• Pomacanthidae
• Pomacentridae
  Pomacentridae
  Pomacentridae are a family of perciform fish, comprising the damselfishes and clownfishes. They are primarily marine, while a few species inhabit freshwater and brackish environments . They are noted for their hardy constitutions and territoriality...
  
  
• Pomatomidae
• Potamotrygonidae
  Potamotrygonidae
  River stingrays are Neotropical freshwater fishes of the Potamotrygonidae family .They are native to northern, central and eastern South America, living in rivers that drain into the Caribbean, and into the Atlantic as far south as the Río de la Plata in Argentina...
  
  
• Priacanthidae
  Priacanthidae
  Priacanthidae is a family of fish, common name bigeye, comprising 18 species of marine fishes. "Catalufa" is an alternate common name for some members of the priacanthidae family. The etymology of the scientific name refers to the family's very rough, spined scales...
  
  
• Pristidae
• Pristiophoridae
• Prochilodontidae
  Prochilodontidae
  The Prochilodontidae, or flannel-mouthed characins, are a small family of fishes found primarily in the northern half of South America, south to Paraguay and northern Argentina...
  
  
• Profundulidae
  Profundulidae
  Profundulidae is a family of teleost fish endemic to Mexico, Guatemala and other countries of Central America. This family is monotypic with only a single genus, Profundulus...
  
  
• Proscylliidae
  Proscylliidae
  The finback catsharks are a small family, Proscylliidae, of ground sharks.-Genera and species:* Ctenacis Compagno, 1973** Ctenacis fehlmanni * Eridacnis H. M. Smith, 1913...
  
  
• Protopteridae

Ps-Pt

• Psettodidae
• Pseudaphritidae
• Pseudocarchariidae
• Pseudochromidae
• Pseudomugilidae
  Pseudomugilidae
  The Blue-eyes are the family of atheriniform fish, the Pseudomugilidae, related to the rainbowfishes. They inhabit fresh and brackish water in Australia and New Guinea. Blue-eyes are small fish, typically no more than in length...
  
  
• Pseudopimelodidae
  Pseudopimelodidae
  Pseudopimelodidae is a small family of catfishes. Some of these fish are popular aquarium fish.-Taxonomy:This family was formerly a subfamily of Pimelodidae. Pseudopimelodidae is a monophyletic group. Previously, the superfamily Pseudopimelodoidea is sister to superfamilies Sisoroidea + Loricarioidea...
  
  
• Pseudotriakidae
  Pseudotriakidae
  Pseudotriakidae is a small family of ground sharks, order Carcharhiniformes, containing the false catsharks and gollumsharks. It contains the only ground shark species that exhibit intrauterine oophagy, in which developing fetuses are nourished by eggs produced by their mother.-Genera and...
  
  
• Pseudotrichonotidae
  Pseudotrichonotidae
  The Pseudotrichonotidae are a small family of aulopiform fish, consisting of just two species in a single genus, Pseudotrichonotus....
  
  
• Psilorhynchidae
• Psychrolutidae
  Psychrolutidae
  The fish family Psychrolutidae contains the fatheads or fathead sculpins, including the blobfishes. There are 9 genera and about 30 species. This poorly known family consists of bottom-dwelling marine sculpins shaped like tadpoles, with large heads and bodies that taper back into small, flat tails...
  
  
• Ptereleotridae
• Ptilichthyidae

R

• Rachycentridae
• Radiicephalidae
• Rajidae
• Regalecidae
• Retropinnidae
  Retropinnidae
  Retropinnidae is a family of bony fish that contains the southern hemisphere smelts and graylings. They are quite closely related to the northern smelts , which they greatly resemble, but not to the northern graylings . Species from this family are only found in southeastern Australia and New Zealand...
  
  
• Rhamphichthyidae
  Rhamphichthyidae
  Sand knifefishes are freshwater fishes of the Rhamphichthyidae family, from South America. There are only 3 genera and around 15 species in this group....
  
  
• Rhamphocottidae
• Rhincodontidae
• Rhinobatidae
• Rhinochimaeridae
  Rhinochimaeridae
  Rhinochimaeridae, commonly known as long-nosed chimaeras, is a family of cartilaginous fish. They are similar in form and habits to other chimaeras, but have an exceptionally long, conical or paddle-shaped, snout. The snout has numerous sensory nerve endings, and is used to find food such as small...
  
  
• Rhyacichthyidae
  Rhyacichthyidae
  The family Rhyacichthyidae, or loach gobies is a small family of perciform fish that consists of two genera and three species. They inhabit marine and fresh water in Oceania and the eastern Pacific.-Species:*Genus Protogobius...
  
  
• Rivulidae
  Rivulidae
  Rivulidae are a family of killifishes in the order Cyprinodontiformes. They are commonly known as rivulids, South American killifish or New World killifish. The latter names are slightly misleading however, as they are neither restricted to South America – though most are in fact found there...
  
  
• Rondeletiidae

Sa-Sc

• Saccopharyngidae
• Salangidae
  Salangidae
  Icefishes or noodlefishes are a family, the Salangidae, of osmeriform fish, related to the smelts. They are found in freshwater environments in Southeast Asia, although a few species are anadromous, spending most of their life in coastal waters, and only visiting fresh water to spawn.They have...
  
  
• Salmonidae
  Salmonidae
  Salmonidae is a family of ray-finned fish, the only living family currently placed in the order Salmoniformes. It includes salmon, trout, chars, freshwater whitefishes and graylings...
  
  
• Samaridae
  Samaridae
  Samaridae is a family of flounders containing more than 25 species in three genera.-Species:The family contains more than 25 described species.* Genus Plagiopsetta Franz, 1910.** Plagiopsetta glossa Franz, 1910....
  
  
• Scaridae
• Scatophagidae
  Scatophagidae
  The scats are a small family, Scatophagidae, of fishes in the order Perciformes.They are small fish native to the Indian and western Pacific Ocean that have been popular in the aquarium trade in the last 30 years...
  
  
• Schilbeidae
  Schilbeidae
  The schilbid catfishes are a family of catfishes native to Africa and southern Asia. These fish tend to swim in open water....
  
  
• Schindleriidae
• Sciaenidae
  Sciaenidae
  Sciaenidae is a family of fish commonly called drums, croakers, or hardheads for the repetitive throbbing or drumming sounds they make...
  
  
• Scoloplacidae
• Scomberesocidae
• Scombridae
  Scombridae
  Scombridae is the family of the mackerels, tunas, and bonitos, and thus includes many of the most important and familiar food fishes. The family consists of about 55 species in 15 genera and two subfamilies...
  
  
• Scombrolabracidae
• Scombropidae
• Scopelarchidae
• Scophthalmidae
  Scophthalmidae
  Scophthalmidae is a family of flatfish which includes the turbot. It contains ten species in four genera.-Species:-References: Species List . Accessed at 2 May 2009. taxon at http://www.eol.org....
  
  
• Scorpaenidae
• Scyliorhinidae
• Scytalinidae

Se-St

• Sebastidae
  Sebastidae
  Sebastidae is a family of marine fish in the order Scorpaeniformes. Their common names include rockfishes, thornyheads and rockcods. Despite the latter name, they are not closely related to the cods in the genus Gadus, nor the rock cod, Lotella rhacina.Not all authorities recognise this family as...
  
  
• Serranidae
  Serranidae
  Serranidae is a large family of fishes, belonging to the order Perciformes. The family contains about 450 species of serranids in 64 genera, including the sea basses and the groupers...
  
  
• Serrivomeridae
• Setarchidae
  Setarchidae
  Setarchidae is a small family of scorpionfishes.Not all classifications recognise this family; Nelson and ITIS include it in the family Scorpaenidae....
  
  
• Siganidae
• Sillaginidae
  Sillaginidae
  The Sillaginidae, commonly known as the smelt-whitings, whitings, sillaginids, sand borers and sand-smelts, are a family of benthic coastal marine fishes in the order Perciformes. The smelt-whitings inhabit a wide region covering much of the Indo-Pacific, from the west coast of Africa east to Japan...
  
  
• Siluridae
• Sisoridae
  Sisoridae
  Sisoridae is a family of catfishes . These Asian catfish live in fast-moving waters and often have adaptations that allow them to adhere to objects in their habitat.-Taxonomy:...
  
  
• Soleidae
  Soleidae
  The true soles are a family, Soleidae, of flatfishes, and include species that live in salt water and fresh water. They are bottom-dwelling fishes feeding on small crustaceans and other invertebrates. Other flatfishes are also known as soles....
  
  
• Solenostomidae
• Sparidae
  Sparidae
  The Sparidae is a family of fish, included in the order Perciformes. The fish of the family are commonly called sea breams and porgies . The sheepshead, scup, and red sea bream are species in this family. They are found in shallow temperate and tropical waters and are bottom-dwelling carnivores....
  
  
• Sphyraenidae
• Sphyrnidae
• Squalidae
  Squalidae
  Squalidae is the family of dogfish sharks. They are found in the Atlantic, Pacific, and Indian oceans, from tropical equatorial climates to the Arctic and Antarctic....
  
  
• Squatinidae
• Stegostomatidae
• Stephanoberycidae
• Sternoptychidae
  Sternoptychidae
  The marine hatchetfishes or deep-sea hatchetfishes as well as the related bottlelights, pearlsides and constellationfishes are small deep-sea bathypelagic ray-finned fish of the stomiiform family Sternoptychidae...
  
  
• Sternopygidae
• Stichaeidae
• Stomiidae
  Stomiidae
  Stomiidae is a family of deep-sea ray-finned fish, including the barbeled dragonfishes, stareaters and loosejaws.Stomiids are generally elongated fish with black or near-black bodies, but they are highly variable in form, and are sometimes grouped into multiple different families as a result. The...
  
  
• Stromateidae
  Stromateidae
  The family Stromateidae of butterfishes contains 17 species of fish in 3 genera. Butterfishes live in coastal waters off the Americas, western Africa and in the Indo-Pacific.-Species:* Genus Pampus...
  
  
• Stylephoridae

Su-Sy

• Sundasalangidae
• Symphysanodontidae
• Synanceiidae
• Synaphobranchidae
• Synbranchidae
• Syngnathidae
  Syngnathidae
  Syngnathidae is a family of fish which includes the seahorses, the pipefishes, and the weedy and leafy sea dragons. The name is derived from Greek, meaning "fused jaw" - syn meaning fused or together, and gnathus meaning jaws. This fused jaw trait is something the entire family has in common...
  
  
• Synodontidae
  Synodontidae
  The Lizardfishes are a family, the Synodontidae, of aulopiform fish. They are found in tropical and subtropical marine waters throughout the world....
  
  

T

• Telmatherinidae
  Telmatherinidae
  The Sail-fin silversides are a family of atheriniform fish, the Telmatherinidae, inhabiting fresh and brackish water . All but one species are restricted to the island of Sulawesi, and most are found solely in the Malili Lakes of that island....
  
  
• Terapontidae
  Terapontidae
  Grunters or tigerperches are fishes in the family Terapontidae . They are found in shallow coastal waters in the Indian Ocean and western Pacific, where they live in saltwater, brackish and freshwater habitats...
  
  
• Tetrabrachiidae
• Tetragonuridae
• Tetraodontidae
• Tetrarogidae
  Tetrarogidae
  The waspfishes are a family, the Tetrarogidae, of scorpaeniform fishes native to the Indian Ocean and the West Pacific. They are closely related to the scorpionfishes. As their name suggests, waspfishes are often venomous...
  
  
• Thaumatichthyidae
• Torpedinidae
• Toxotidae
• Trachichthyidae
• Trachinidae
• Trachipteridae
• Triacanthidae
  Triacanthidae
  Triacanthidae, commonly known as triplespines or tripodfishes, is a family of Indo-Pacific fishes. It is classified in the order Tetraodontiformes, along with the pufferfishes and the ocean sunfish...
  
  
• Triacanthodidae
• Triakidae
• Trichiuridae
• Trichodontidae
  Trichodontidae
  The Trichodontidae, or sandfishes are a small perciform family of fishes that occur in the North Pacific. The family consists of two monotypic genera:* Arctoscopus Jordan and Evermann, 1896...
  
  
• Trichomycteridae
  Trichomycteridae
  Trichomycteridae is a family of catfishes commonly known as the pencil or parasitic catfishes. This family includes the infamous candiru fish, feared by some people for its alleged habit of entering into the urethra of humans....
  
  
• Trichonotidae
• Triglidae
• Triodontidae
• Tripterygiidae

Z

• Zanclidae
• Zaniolepididae
• Zaproridae
• Zeidae
  Zeidae
  The Zeidae are a family of large, showy, deep-bodied zeiform marine fish—the "true dories". Found in the Atlantic, Indian, and Pacific Ocean, the family contains just six species in two genera...
  
  
• Zenionidae
  Zenionidae
  The Zenionidae are a family of large, showy, deep-bodied zeiform marine fish. Found in the Atlantic, Indian, and Pacific Ocean, the family contains just seven species in three genera.The family was formerly known as Macrurocyttidae.- Species :...
  
  
• Zoarcidae