Fish Encyclopedia
Search and identify 1,000+ fish species — freshwater, saltwater, reef, and pelagic — with habitat, size, diet, behavior, and how to tell them apart.
Arctic Grayling
The Arctic grayling is a cold-water salmonid recognized by its tall, colorfully spotted dorsal fin, inhabiting clean rivers and lakes across northern North America and Siberia.
freshwater
Asian Swamp Eel
A slender, limbless, snake-like eel native to rice paddies and marshes of East and Southeast Asia, known for its air-breathing ability and its establishment as an introduced species in parts of the southeastern United States.
freshwater
Australian Rainbowfish
A widespread, variably colored rainbowfish found across tropical Australian and southern New Guinea waterways, ranging from olive-silver to vivid blue and yellow forms.
freshwater
Atlantic Salmon
An iconic anadromous fish of the North Atlantic, born in cold rivers, maturing at sea, and returning to natal streams to spawn.
freshwater
African Arowana
A large African bonytongue fish with a toothless, filter-feeding mouth adapted for straining plankton and detritus from floodplain waters.
freshwater
Arctic Char
A cold-adapted char of circumpolar northern waters, showing extremely variable coloration and body form across isolated lake and anadromous populations.
freshwater
Auratus Cichlid
A small, strikingly striped mbuna from Lake Malawi, the auratus cichlid reverses its coloration between sexes as it matures, with golden juveniles giving way to dark, aggressive adult males.
freshwater
Australian Lungfish
One of the most primitive living fish, this large freshwater species has a single lung, paddle-like fins, and a lineage that has remained largely unchanged for over 100 million years.
freshwater
Argentine Pearlfish
A deep-bodied annual killifish from the pampas of Argentina and Uruguay, marked with pearly white spots. It lives in seasonal ponds and survives dry months as diapausing eggs in the mud.
freshwater
Arowana
The arowana is a large, ancient freshwater fish of the Amazon basin, genus Osteoglossum, known for its upturned mouth, long fins, and ability to leap for surface prey.
freshwater
American Brook Lamprey
The American brook lamprey is a small, non-parasitic freshwater lamprey found in clean streams across eastern North America, closely related to the Arctic lamprey but never feeding once it reaches adulthood.
freshwater
Banded Knifefish
An elongated, eel-like South American fish that generates weak electric fields to navigate and communicate in murky water.
freshwater
American Paddlefish
The American paddlefish is a primitive filter-feeding fish famous for its long, paddle-shaped snout, native to the Mississippi River basin of North America.
freshwater
Betta
A small, vividly colored Southeast Asian freshwater fish famed for its flowing fins and the intense territorial aggression of males toward rivals.
freshwater
Amazon Molly
An entirely female species that reproduces through a rare cloning-like process, the Amazon molly is a biological curiosity native to rivers along the Texas-Mexico border.
freshwater
Apache Trout
The Apache trout is a golden-yellow native trout found only in the high-elevation streams of Arizona's White Mountains, and it is the state fish of Arizona following decades of conservation recovery efforts.
freshwater
African Sharptooth Catfish
A hardy, air-breathing catfish native to Africa and the Middle East, capable of surviving in low-oxygen water and even moving briefly over land, now widely farmed and invasive elsewhere.
freshwater
American Gizzard Shad
A deep-bodied, blunt-snouted herring relative common in lakes and rivers across eastern and central North America, the American Gizzard Shad is a highly abundant forage fish named for its muscular, gizzard-like stomach.
freshwater
Alligator Gar
A massive, armor-scaled freshwater fish with a broad alligator-like snout lined with two rows of sharp teeth, among the largest freshwater fish in North America.
freshwater
Angelfish
A tall, laterally flattened cichlid from the Amazon basin, prized in the aquarium hobby for its striking triangular fin profile and extensive range of bred color varieties.
freshwater
Arapaima
One of the largest freshwater fish in the world, this massive Amazonian species has thick armor-like scales and must surface periodically to breathe air.
freshwater
American Flagfish
A stocky, deep-bodied killifish native to Florida, named for the red-and-blue striped, star-marked flank pattern of breeding males reminiscent of a flag.
freshwater
American Eel
The American Eel spends most of its life in North American rivers and estuaries before migrating once to the Sargasso Sea to spawn and die.
freshwater
African Tiger Fish
A ferocious, fast-swimming predator of southern and eastern African rivers, armed with prominent interlocking teeth and known for spectacular aerial strikes on prey.
freshwater
African Lungfish
An eel-like freshwater fish capable of breathing air and surviving months buried in dried mud during droughts, one of the most drought-resistant vertebrates known.
freshwater