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.
Marble Trout
Marble trout are a large, distinctively patterned native trout of the Balkan Peninsula, named for the marbled, olive-and-brown pattern covering their body, and are now considered vulnerable due to hybridization with introduced brown trout.
freshwater
Sea Trout
Sea Trout is the migratory, sea-run form of the brown trout, spending its adult life feeding along European coastlines before returning to rivers to spawn.
saltwater
Ohrid Trout
The Ohrid Trout is a salmonid endemic to Lake Ohrid on the border of North Macedonia and Albania, found nowhere else on Earth and now critically endangered in the wild.
freshwater
Lake Trout
A large, deep-lake char native to cold northern North American waters, marked by pale spots on a dark greenish-gray body and a deeply forked tail. It typically inhabits the coldest, deepest zones of large lakes.
freshwater
Cutthroat Trout
A native western North American trout named for the distinctive red-orange slash marks under its jaw, found in an array of subspecies across cold streams and mountain lakes.
freshwater
Brook Trout
A colorful char native to cold, clear streams of eastern North America, marked by worm-like back markings and red spots haloed in blue along its sides. It is highly sensitive to water quality and temperature.
freshwater
Brown Trout
A golden-brown salmonid native to Europe and western Asia, marked by dark and reddish spots along its body, now widely introduced across the globe. It favors cool, clear rivers, streams, and lakes.
freshwaterTiger Trout
Tiger trout are a sterile hybrid between brown trout and brook trout, prized by anglers for their striking maze-like markings and aggressive feeding habits.
freshwater
Rainbow Trout
A popular salmonid native to Pacific-drainage rivers of North America and Asia, known for its silvery body, dark spotting, and the broad pink-red stripe that gives the species its name.
freshwater
Golden Trout
One of the most brilliantly colored freshwater fish in North America, native to a small area of high-elevation streams in California's Sierra Nevada, marked with vivid golden-orange flanks and crimson stripes.
freshwater
Gila Trout
The Gila trout is a rare golden-hued native trout restricted to a handful of remote headwater streams in New Mexico and Arizona, and remains one of North America's most range-limited trout species.
freshwater
Bull Trout
A large, cold-water char native to the Pacific Northwest and Rocky Mountains, requiring exceptionally cold, clean streams and listed as threatened across much of its range in the United States.
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
Marbled Hatchetfish
A tiny South American fish with a deep, keeled belly and enlarged pectoral fins that let it skim and glide just above the water surface to escape predators.
freshwater
Marbled Grouper
The marbled grouper is an uncommon western Atlantic reef fish with a distinctive dark, marbled or streaked pattern that gives way to a dark 'charcoal' belly, often seen near caves and drop-offs.
reef
Marbled Lungfish
The largest of the African lungfish, marked with a dark mottled pattern, capable of surviving prolonged drought buried in a mucus-lined mud burrow.
freshwater
Marbled Swamp Eel
A snake-like, limbless eel of Central and South American swamps and slow rivers, marked with a mottled, marbled pattern and equipped with air-breathing lungs-like tissue for surviving in stagnant water.
freshwater
Marbled Electric Ray
A bottom-dwelling electric ray capable of generating a strong electric shock, patterned with a mottled marbled coloration for camouflage on the seabed.
cartilaginous
Sand Seatrout
A pale, slender weakfish common in Gulf of Mexico bays and estuaries, closely related to spotted seatrout but lacking body spots.
brackish
Weakfish
The Weakfish is an iridescent greenish-bronze sciaenid with diagonal spotted markings, found in mid-Atlantic estuaries and coastal waters of the U.S.
brackish
Steelhead
The anadromous, sea-run form of rainbow trout, prized by anglers for its powerful runs and acrobatic leaps after migrating between rivers and the Pacific Ocean.
freshwaterSplake
Splake are a fertile hybrid char produced by crossing brook trout and lake trout, combining the fast growth of brook trout with the longevity and deep-water habits of lake trout.
freshwater
Leopard Coral Grouper
A striking Indo-Pacific reef predator with a reddish-orange body densely covered in small electric-blue spots, giving it a leopard-like pattern.
reef
Spotted Seatrout
A slender estuarine predator of the southeastern United States, recognized by the bold black spots scattered across its silvery back and dorsal fin.
brackish