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.
Buenos Aires Tetra
A hardy, cold-tolerant characin from the Parana-La Plata basin, prized in aquariums for its active schooling behavior and subtropical resilience.
freshwaterHerring
One of the world's most abundant fish, the herring forms colossal schools in cold North Atlantic waters and underpins much of the region's marine food web.
pelagic
Bull Rout
Known as the shorthorn sculpin elsewhere, the Bull Rout is a camouflaged, spiny-headed fish common in cold North Atlantic tide pools and rocky shores.
saltwaterWitch Flounder
A slender, tongue-shaped deep-water North Atlantic flatfish with plain grayish-brown coloration, fine scales, and a preference for cold muddy shelf and slope bottoms.
deepsea
Dojo Loach
An elongated, whiskered East Asian loach, sold in the aquarium and pond trade under the Japanese name 'dojo,' known for burrowing in soft mud and tolerating cold water.
freshwater
Cunner
A small, cold-hardy wrasse with highly variable coloring, found on rocky reefs and kelp beds along the western Atlantic and known for becoming dormant in winter.
saltwaterSlickhead
A dark, soft-bodied deep-sea fish named for its smooth, scaleless head, drifting slowly along cold continental slopes far beyond the reach of sunlight.
deepsea
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
Atlantic Mackerel
A fast-swimming schooling fish with iridescent blue-green wavy stripes across its back, found in cold and temperate waters on both sides of the North Atlantic.
pelagic
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.
freshwaterWhitefish
Lake whitefish are silvery, streamlined members of the salmon family that inhabit cold, deep lakes across North America, feeding along the bottom for insect larvae and small invertebrates.
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
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
Cisco
Cisco, also known as lake herring, are slender silvery relatives of whitefish that form large open-water schools in the cold lakes of the northern United States and Canada, feeding mainly on plankton.
freshwater
Mottled Sculpin
A small, mottled brown freshwater sculpin found in clear, cold streams and lakes across North America, identified by its large head, wide pectoral fins, and lack of scales.
freshwater
Common Lumpsucker
Shaped like a rounded ball with a sucker disc instead of pelvic fins, the Common Lumpsucker drifts through cold North Atlantic waters before moving inshore to spawn on rocky shores.
saltwater
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
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.
freshwaterSouthern Blue Whiting
The southern blue whiting is a slender, schooling Gadidae found in cold Southern Hemisphere waters around South America and New Zealand, closely resembling its North Atlantic relative but occupying entirely separate populations.
pelagic