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
Grayling
A slender freshwater salmonid relative famed for its tall, sail-like dorsal fin, native to cold, clear rivers of Europe.
freshwater
European Grayling
The European grayling is a slender salmonid famous for its tall, sail-like, iridescent dorsal fin, found in cold, clear rivers and lakes across much of Europe.
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
Arctic Cod
Arctic cod, or polar cod, is a small, ice-associated Gadidae found throughout the circumpolar Arctic, recognized by its slender body, deeply forked tail, and role as the region's key forage fish.
pelagic
Arctic Lamprey
The Arctic lamprey is a jawless, circumpolar species found across Arctic and sub-Arctic rivers and coastal waters of North America and Asia, recognized by its sucker mouth and slender eel-like body.
brackish
Gray Angelfish
A large, plain gray Caribbean and Atlantic angelfish with a pale, pouty mouth and subtly yellow-tinged scale edges, often seen alone or in pairs around reef structure.
reef
Northern Wolffish
The largest wolffish species, the Northern Wolffish is a plain grey-brown, deep-water predator of the North Atlantic and Arctic with powerful crushing jaws.
deepsea
Greenland Shark
A massive, slow-moving Arctic shark believed to be the longest-lived vertebrate on Earth, with lifespans possibly exceeding 250 years.
deepsea
Dolly Varden
A char of Pacific coastal rivers named for a colorfully dressed Dickens character, closely related to and often confused with Arctic Char.
freshwater
Spotted Wolffish
A large, deep-water wolffish covered in bold dark spots, found in cold Arctic and North Atlantic waters on rocky and gravel seafloor.
deepsea
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
Greenland Halibut
A cold-water, deep-sea North Atlantic and Arctic flatfish with a dark body on both sides, a large toothy mouth, and a less flattened posture than typical flounders.
deepsea
Greenland Cod
The Greenland cod is a stocky, cold-adapted cod relative found in shallow coastal Arctic waters around Greenland and eastern Canada, distinguished by its deep body and short head.
saltwater
Grey Gurnard
A bottom-dwelling gurnard with an armored, pale-spotted grey-brown back and large bluish pectoral fins, common across sandy shelf waters of Europe.
saltwater
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
Senegal Bichir
An elongated, primitive-looking freshwater fish with a row of small spiny finlets along its back and paired lung-like breathing organs, retaining features from ancient ray-finned fish ancestors.
freshwater
Mangrove Snapper
A grayish snapper common along mangrove shorelines and estuaries of the western Atlantic, showing a faint dark stripe through the eye and a pointed, angular head.
brackish
Sauger
A slender, olive-gold relative of the walleye, best known for the rows of black spots on its spiny dorsal fin and its love of murky river currents.
freshwater
Reef Shark
A common, streamlined shark patrolling Indo-Pacific coral reefs, recognized by its broad black-edged tail fin and stout gray body.
reef
Canary Rockfish
A vivid orange-and-gray rockfish of the Pacific continental shelf, easily recognized by its bright orange fins and mottled orange-and-gray body pattern.
saltwater
Galapagos Shark
A large, robust gray shark commonly encountered around remote oceanic islands, closely resembling the Dusky and Silky Sharks but slightly stockier.
saltwater
Snowy Grouper
A dark gray-brown deepwater grouper of the western Atlantic; juveniles are boldly marked with white spots that fade to a plainer, darker pattern in large adults.
deepsea
Panther Grouper
An unmistakable Indo-Pacific grouper with a pale gray body covered in round black spots, a small head, and a distinctive humped, sloping forehead profile.
reef