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Section through the gill arch and plates of a bony fish. Labels: b, gill plates with capillaries; c, afferent vessels with venous blood; d, efferent vessel with arterial blood; a, skeleton of arch.

Gill Arch and Plates

Section through the gill arch and plates of a bony fish. Labels: b, gill plates with capillaries; c,…

Internal ear of different vertebrates. I, fish; II, bird; III, mammal. Labels: U, utriculus with semicircular canals; S, sacculus; US, utriculus and sacculus; C, cochlear duct; L, lagena; Cr, canalis reuniens; R, recessus vestibuli.

Internal Ear of Vertebrates

Internal ear of different vertebrates. I, fish; II, bird; III, mammal. Labels: U, utriculus with semicircular…

The maigre or shad-fish (Argyrosomus regius) is a solitary carnivorous drum in the Sciaenidae family.

Maigre

The maigre or shad-fish (Argyrosomus regius) is a solitary carnivorous drum in the Sciaenidae family.

The Atlantic Spanish Mackerel (Scomberomorus maculatus) is a migratory species of mackerel common to the Gulf of Mexico.

Atlantic Spanish Mackerel

The Atlantic Spanish Mackerel (Scomberomorus maculatus) is a migratory species of mackerel common to…

The Atlantic Bumper (Chloroscombrus chrysurus) is a game fish in the Carangidae family.

Atlantic Bumper

The Atlantic Bumper (Chloroscombrus chrysurus) is a game fish in the Carangidae family.

Scopelus (Myctophum) boops is a species of deep sea lanternfish in the Myctophidae family.

Lanternfish

Scopelus (Myctophum) boops is a species of deep sea lanternfish in the Myctophidae family.

The California Scorpionfish (Scorpaena guttata) is a rockfish named for the sting of its dorsal spines.

California Scorpionfish

The California Scorpionfish (Scorpaena guttata) is a rockfish named for the sting of its dorsal spines.

The halfmoon (Medialuna californiensis) is a species of edible fish in the Kyphosidae family of sea chubs.

Halfmoon

The halfmoon (Medialuna californiensis) is a species of edible fish in the Kyphosidae family of sea…

The Daddy Sculpin (Myoxocephalus groenlandicus) is a small coastal fish of Northern Europe. It is also known as the Father Lasher and has the synonym Myoxocephalus scorpius.

Daddy Sculpin

The Daddy Sculpin (Myoxocephalus groenlandicus) is a small coastal fish of Northern Europe. It is also…

The scup (Stenotomus chrysops) is a fish common in the Atlantic Ocean. it is in the Sparidae family of breams or porgies.

Scup

The scup (Stenotomus chrysops) is a fish common in the Atlantic Ocean. it is in the Sparidae family…

The burbot (Lota lota), is the only freshwater member of the cod family, gadidae. It is most common in streams and lakes of North America and Europe above 40°N latitude. They are fairly common in Lake Erie but are also found in the other Great Lakes.

Burbot

The burbot (Lota lota), is the only freshwater member of the cod family, gadidae. It is most common…

Electric catfish is the common name for the catfish (order Siluriformes) family Malapteruridae. This family includes two genera, Malapterurus and Paradoxoglanis with 19 species. Several species of this family have the ability to produce an electric shock of up to 350 volts using electroplaques of an electric organ. Electric catfish are found in tropical Africa and the Nile River. Electric catfish are usually nocturnal and feed primarily on other fish, incapacitating their prey with electric discharges.

Electric Catfish

Electric catfish is the common name for the catfish (order Siluriformes) family Malapteruridae. This…

The Goldfish, Carassius auratus, was one of the earliest fish to be domesticated, and is still one of the most commonly kept aquarium fish and water garden fish. A relatively small member of the carp family, the goldfish is a domesticated version of a dark-gray/brown carp native to East Asia. It was first domesticated in China and introduced to Europe in the late 17th century. Goldfish can grow to a maximum length of 23 inches (159 cm) and a maximum weight of 9.9 pounds (4.5 kg), although this is rare; few goldfish reach even half this size. The oldest recorded goldfish lived to 49 years, but most household goldfish generally live only six to eight years, due to being kept in bowls.

Gold Fish

The Goldfish, Carassius auratus, was one of the earliest fish to be domesticated, and is still one of…

The brook trout, Salvelinus fontinalis, (sometimes called the eastern brook trout, Adirondack coaster lake trout) is a species of fish in the salmon family of order Salmoniformes. The brook trout is native to small streams, creeks, lakes, and spring ponds. Some brook trout are anadromous. It is native to a wide area of eastern North America but increasingly confined to higher elevations southward in the Appalachian Mountains to northern Georgia, Canada from the Hudson Bay basin east, the Great Lakes–Saint Lawrence system, and the upper Mississippi River drainage as far west as eastern Iowa.

Brook Trout

The brook trout, Salvelinus fontinalis, (sometimes called the eastern brook trout, Adirondack coaster…

A halibut is a type of flatfish from the family of the right-eye flounders (Pleuronectidae). This name is derived from haly (holy) and butt (flat fish), alleged to be called so from being commonly eaten on holy-days. Halibut live in both the North Pacific and the North Atlantic oceans and are highly regarded food fish.

Halibut

A halibut is a type of flatfish from the family of the right-eye flounders (Pleuronectidae). This name…

Mackerel is a common name applied to a number of different species of fish, mostly, but not exclusively, from the family Scombridae. They occur in all tropical and temperate seas. Most live offshore in the oceanic environment but a few, like the Spanish mackerel (Scomberomorus maculatus), enter bays and can be caught near bridges and piers. Common features of mackerels are a slim, cylindrical shape (as opposed to the tunas which are deeper bodied) and numerous finlets on the dorsal and ventral sides behind the dorsal and anal fins. The scales are extremely small, if present. The largest species called "mackerel" is the king mackerel (Scomberomorus cavalla) which can grow to 66 inches (1.68 m). A female mackerel lays about 500,000 eggs at a time

Mackerel

Mackerel is a common name applied to a number of different species of fish, mostly, but not exclusively,…

Sheatfishes or freshwater catfishes are a family (Siluridae) of catfishes (order Siluriformes). There are about 100 living species of silurids.

Sheatfish

Sheatfishes or freshwater catfishes are a family (Siluridae) of catfishes (order Siluriformes). There…

Tetraodontidae is a family of primarily marine and estuarine fish. The family includes many familiar species which are variously called puffers, balloonfish, blowfish, bubblefish, globefish, swellfish, toadfish, and toadies. They are morphologically similar to the closely related porcupinefish, which have large conspicuous spines (unlike the small, almost sandpaper-like spines of Tetraodontidae). The scientific name, Tetraodontidae, refers to the four large teeth, fused into an upper and lower plate, which are used for crushing the shells of crustaceans and mollusks, and red worms, their natural prey. Puffer Fish are the second most poisonous vertebrate in the world, the first being a Golden Poison Frog. The skin and certain internal organs of many Tetraodontidae are highly toxic to humans, but nevertheless the meat of some species is considered a delicacy in both Japan (as fugu) and Korea (as bok-uh). If one is caught while fishing, it is recommended that thick gloves are worn to avoid poisoning and getting bitten when removing the hook.

Blowfish

Tetraodontidae is a family of primarily marine and estuarine fish. The family includes many familiar…

Mackerel is a common name applied to a number of different species of fish, mostly, but not exclusively, from the family Scombridae. They occur in all tropical and temperate seas. Most live offshore in the oceanic environment but a few, like the Spanish mackerel (Scomberomorus maculatus), enter bays and can be caught near bridges and piers. Common features of mackerels are a slim, cylindrical shape (as opposed to the tunas which are deeper bodied) and numerous finlets on the dorsal and ventral sides behind the dorsal and anal fins. The scales are extremely small, if present. The largest species called "mackerel" is the king mackerel (Scomberomorus cavalla) which can grow to 66 inches (1.68 m). A female mackerel lays about 500,000 eggs at a time

Mackerel

Mackerel is a common name applied to a number of different species of fish, mostly, but not exclusively,…

The electric eel, Electrophorus electricus, is a species of fish. It is capable of generating powerful electric shocks, which it uses for both hunting and self-defense. It is an apex predator in its South American range. Despite its name it is not an eel at all but rather a knifefish.

Electric Eel

The electric eel, Electrophorus electricus, is a species of fish. It is capable of generating powerful…

The gourami or gouramies are a family, Osphronemidae, of freshwater perciform fishes. The fish are native to Asia, from Pakistan and India to the Malay Archipelago and north-easterly towards Korea. "Gouramies" is an example of a redundant plural, like "cherries" or "Pakistanis"; Gourami is already plural, in its original language. The most famous species of gourami is the "kissing gourami", who do literally lock their exaggerated lips to each other in social displays relating to mating, as a habit of aggression toward other fish of any species, and for seeking food.

Gourami

The gourami or gouramies are a family, Osphronemidae, of freshwater perciform fishes. The fish are native…

Sturgeon is the common name used for some 26 species of fish in the family Acipenseridae, including the genera Acipenser, Huso, Scaphirhynchus and Pseudoscaphirhynchus. One of the oldest families of bony fish in existence, they are native to subtropical, temperate and sub-Arctic rivers, lakes and coastlines of Eurasia and North America. They are distinctive for their elongated bodies, lack of scales, and occasional great size: Sturgeons ranging from 7–12 feet (2-3&frac12 m) in length are common, and some species grow up to 18 feet (5.5 m). Most sturgeons are anadromous bottom-feeders, spawning upstream and feeding in river deltas and estuaries. While some are entirely freshwater, very few venture into the open ocean beyond near coastal areas.

Sturgeon

Sturgeon is the common name used for some 26 species of fish in the family Acipenseridae, including…

Seahorses are a genus (Hippocampus) of fish belonging to the family Syngnathidae, which also includes pipefish and leafy sea dragons. There are over 32 species of seahorse, mainly found in shallow tropical and temperate waters throughout the world. They prefer to live in sheltered areas such as sea grass beds, coral reefs, or mangroves.

Seahorse

Seahorses are a genus (Hippocampus) of fish belonging to the family Syngnathidae, which also includes…

Anglerfish are the members of the order Lophiiformes. They are bony fish named for their characteristic mode of predation, wherein a fleshy growth from the fish's head (the esca) acts as a lure; this is considered analogous to angling. Some anglerfish are pelagic (live in the open water), others are benthic (bottom-dwelling). Some live in the deep sea (e.g. Ceratiidae) and others on the continental shelf (e.g. the frogfishes Antennariidae and the monkfish/goosefish Lophiidae). They occur worldwide. Pelagic forms are most laterally (sideways) compressed whereas the benthic forms are often extremely dorsoventrally compressed (depressed) often with large upward pointing mouths.

Anglerfish

Anglerfish are the members of the order Lophiiformes. They are bony fish named for their characteristic…

Carp is a common name for various freshwater fish of the family Cyprinidae, a very large group of fish originally from Eurasia and southeast Asia. Carp have long been an important food fish to humans, as well as popular ornamental fishes (see koi and goldfish). As a result, carp have been introduced to various locations, though with mixed results.

Carp

Carp is a common name for various freshwater fish of the family Cyprinidae, a very large group of fish…

An illustration of a fish fossil.

Fish Fossil

An illustration of a fish fossil.

The Black Sea Bass (Centropristis striata) is a fish in the Grouper family native to New York, Maine, Florida, and the Gulf of Mexico.

Black Sea Bass

The Black Sea Bass (Centropristis striata) is a fish in the Grouper family native to New York, Maine,…

The Atlantic Pomfret (Brama brama) is a fish in the Bramidae family of pomfrets. Its synonyms and other common names include: sea-bream, Brama rays, Brama australis, Southern rays bream and Ray's Bream.

Atlantic Pomfret

The Atlantic Pomfret (Brama brama) is a fish in the Bramidae family of pomfrets. Its synonyms and other…

The Sea Raven (Hemitripterus americanus) is a bottom-dwelling fish that is common in the north of the Atlantic and Pacific Oceans.

Sea Raven

The Sea Raven (Hemitripterus americanus) is a bottom-dwelling fish that is common in the north of the…

The Northern Sea Robin (Prionotus carolinus) is a species of bottom feeders of the Triglidae family.

Northern Sea Robin

The Northern Sea Robin (Prionotus carolinus) is a species of bottom feeders of the Triglidae family.

The Rose Fish (Sebastes marinus) is a species in the Sebastidae family named for the red color of the adults.

Rose Fish

The Rose Fish (Sebastes marinus) is a species in the Sebastidae family named for the red color of the…

Gudgeon is a common name for a number of small freshwater fishes of the families Cyprinidae, Eleotridae or Ptereleotridae. Most gudgeons are elongate, bottom-dwelling fish, many of which live in rapids and other fast moving water.

Gudgeon

Gudgeon is a common name for a number of small freshwater fishes of the families Cyprinidae, Eleotridae…

An illustration of a small jellyfish. Jellyfish are free-swimming members of the phylum Cnidaria. ellyfish don't have specialized digestive, osmoregulatory, central nervous, respiratory, or circulatory systems. They digest using the gastrodermal lining of the gastrovascular cavity, where nutrients are absorbed. They do not need a respiratory system since their skin is thin enough that the body is oxygenated by diffusion. They have limited control over movement and mostly free-float, but can use the hydrostatic skeleton of the water pouch to accomplish vertical movement through pulsations of the disc-like body.

Jellyfish

An illustration of a small jellyfish. Jellyfish are free-swimming members of the phylum Cnidaria. ellyfish…

The Port Jackson shark (Heterodontus portusjacksoni) is a species in the Heerodontidae family of bullhead sharks.

Port Jackson Shark

The Port Jackson shark (Heterodontus portusjacksoni) is a species in the Heerodontidae family of bullhead…

The Comber (Serranus cabrilla) is a small fish of the Serranidae family of perch-like fishes.

Comber

The Comber (Serranus cabrilla) is a small fish of the Serranidae family of perch-like fishes.

The Piraya Piranha or Caribe (Pygocentrus piraya) is a species of piranha in the Characidae family.

Piraya Piranha

The Piraya Piranha or Caribe (Pygocentrus piraya) is a species of piranha in the Characidae family.

The Luck of Lun Chun Foo: An Oriental Fish Story.1. Rising to the bait.

Fishing with Lun Chun Foo 1

The Luck of Lun Chun Foo: An Oriental Fish Story.1. Rising to the bait.

The Luck of Lun Chun Foo: An Oriental Fish Story. 2. A bite.

Fishing with Lun Chun Foo 2

The Luck of Lun Chun Foo: An Oriental Fish Story. 2. A bite.

The Luck of Lun Chun Foo: An Oriental Fish Story. 3. Caught.

Fishing with Lun Chun Foo 3

The Luck of Lun Chun Foo: An Oriental Fish Story. 3. Caught.

The Luck of Lun Chun Foo: An Oriental Fish Story. 4. Landed.

Fishing with Lun Chun Foo 4

The Luck of Lun Chun Foo: An Oriental Fish Story. 4. Landed.

"All aboard for the balloon-fish ascension!"

Balloon Fish Ride

"All aboard for the balloon-fish ascension!"

The American Shad (Alosa sapidissima) is an anadromous fish in the Clupeidae family of herrings, shads, sardines, hilsa, and menhadens.

American Shad

The American Shad (Alosa sapidissima) is an anadromous fish in the Clupeidae family of herrings, shads,…

The Shad-Waiter (Coregonus quadrilateralis) is a whitefish in the Salmonidae family of salmon.

Shad-Waiter

The Shad-Waiter (Coregonus quadrilateralis) is a whitefish in the Salmonidae family of salmon.

Pogonias chromis, a name of several fish so called from the drumming noise they make, said to be due, in part at least, to the grinding of bones upon each other.

Saltwater Drum

Pogonias chromis, a name of several fish so called from the drumming noise they make, said to be due,…

The Bonnethead Shark (Sphyrna tiburo) is a small shark in the Sphyrnidae family of hammerheads.

Bonnethead Shark

The Bonnethead Shark (Sphyrna tiburo) is a small shark in the Sphyrnidae family of hammerheads.

The Sheepshead (Archosargus probatocephalus) is a fish in the Sparidae family of breams and porgies.

Sheepshead

The Sheepshead (Archosargus probatocephalus) is a fish in the Sparidae family of breams and porgies.

The Golden Shiner (Notemigonus crysoleucas) is a fish in the Cyprinidae family of carps and minnows, and is commonly used as bait.

Golden Shiner

The Golden Shiner (Notemigonus crysoleucas) is a fish in the Cyprinidae family of carps and minnows,…

The Shovelnose Sturgeon (Scaphirhynchus platorynchus) is a freshwater fish in the Acipenseridae family of sturgeons.

Shovelnose Sturgeon

The Shovelnose Sturgeon (Scaphirhynchus platorynchus) is a freshwater fish in the Acipenseridae family…

The Spiny Rabbitfish (Siganus spinus) is a perciform fish in the Siganidae family of spinefoots.

Spiny Rabbitfish

The Spiny Rabbitfish (Siganus spinus) is a perciform fish in the Siganidae family of spinefoots.

The Northern Whiting (Sillago sihama) is a fish in the Sillaginidae family of smelt-whitings.

Northern Whiting

The Northern Whiting (Sillago sihama) is a fish in the Sillaginidae family of smelt-whitings.

The Atlantic Silverside (Menidia menidia) is a common fish in the Atherinopsidae family of neotropical silversides.

Atlantic Silverside

The Atlantic Silverside (Menidia menidia) is a common fish in the Atherinopsidae family of neotropical…

The Snubnosed Eel (Simenchelys parasitica) is a fish in the Synaphobranchidae family of cutthroat eels.

Snubnosed Eel

The Snubnosed Eel (Simenchelys parasitica) is a fish in the Synaphobranchidae family of cutthroat eels.

The Slim Sculpin (Radulinus asprellus) is a fish in the Cottidae family of common sculpins.

slim sculpin

The Slim Sculpin (Radulinus asprellus) is a fish in the Cottidae family of common sculpins.

The Lane Snapper (Lutjanus synagris) is a colorful fish in the Lutjanidae family of snappers.

Lane Snapper

The Lane Snapper (Lutjanus synagris) is a colorful fish in the Lutjanidae family of snappers.

The Rainbow Smelt (Osmerus mordax) is a North American fish in the Osmeridae family of smelts named for its brilliant colors.

Rainbow Smelt

The Rainbow Smelt (Osmerus mordax) is a North American fish in the Osmeridae family of smelts named…

The Vermilion Snapper (Rhomboplites aurorubens) is a North American and Atlantic fish in the Lutjanidae family of snappers.

Vermilion Snapper

The Vermilion Snapper (Rhomboplites aurorubens) is a North American and Atlantic fish in the Lutjanidae…

Diagram of the circulation of the fish. Labels: a, branchial circulation; b, somatic circulation; c, heart; d, auricle; e, ventricle; f, arterial trunk.

Circulation of a Fish

Diagram of the circulation of the fish. Labels: a, branchial circulation; b, somatic circulation; c,…

The Tiger Rockfish (Sebastes nigrocinctus) is a rockfish in the Scorpaenidae family of scorpionfish.

Tiger Rockfish

The Tiger Rockfish (Sebastes nigrocinctus) is a rockfish in the Scorpaenidae family of scorpionfish.

The Quillback Rockfish (Sebastes maliger) is a rockfish in the Scorpaenidae family of scorpionfish.

Quillback Rockfish

The Quillback Rockfish (Sebastes maliger) is a rockfish in the Scorpaenidae family of scorpionfish.

The Redlip Blenny (Ophioblennius atlanticus) is one of three species of blennies in the Perciformes order of perch-like fish.

Redlip Blenny

The Redlip Blenny (Ophioblennius atlanticus) is one of three species of blennies in the Perciformes…