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.
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.
freshwaterAustralian Lamprey
The Australian lamprey is a primitive, eel-like jawless fish that spends part of its life as a marine parasite before migrating into coastal rivers of southern Australia and New Zealand to spawn.
brackish
Baltic Herring
A smaller, brackish-water subspecies of the Atlantic Herring, the Baltic Herring is adapted to the low-salinity Baltic Sea and forms one of the region's most abundant and ecologically important schooling fish.
brackish
Western Brook Lamprey
The western brook lamprey is a small, non-parasitic jawless fish that spends most of its life as a burrowing larva in Pacific Northwest streams before a brief, non-feeding adult stage.
freshwaterTadpole Cod
The tadpole cod is a tiny, translucent Gadiform fish named for its tadpole-like shape, found in warm surface waters worldwide and distinguished by its thread-like forward pelvic fins.
pelagic
Round Herring
Named for its unusually rounded, cylindrical body, the Round Herring is a schooling coastal pelagic fish found in temperate and subtropical seas worldwide, serving as an important forage species for larger predators.
pelagic
Pufferfish
A slow-swimming reef fish famous for inflating its body into a spiny ball when threatened, using a fused beak-like set of teeth to feed on hard-shelled invertebrates and algae.
reef
Orange Chromide
A small, bright orange-yellow cichlid from South Asian estuaries, marked by a single dark spot near the tail. It is the smallest member of its genus and a popular, peaceful aquarium fish.
brackish
Lawnmower Blenny
The Lawnmower Blenny is a mottled brown-and-cream reef fish with a stocky body and comb-like teeth, known for grazing algae off rock and rubble surfaces on shallow Indo-Pacific reefs.
reefJapanese Sardine
A schooling pelagic fish abundant in the waters around Japan, the Japanese Sardine undergoes dramatic multi-decade population cycles and forms one of the largest single-species biomasses in the northwest Pacific.
pelagic
Creek Chub
A stout, adaptable minnow common in small North American creeks, the creek chub is a dominant predator in headwater streams, feeding on insects and small fish, and known for building spawning nest mounds.
freshwaterBluestripe Fangblenny
An elongated blenny with a blue-and-black striped body that mimics cleaner wrasse to approach unsuspecting fish, using enlarged fangs to nip scales, mucus, or tissue before darting away.
reef
Summer Flounder
The summer flounder, also called fluke, is a left-eyed flatfish common along the US Atlantic coast, prized as a popular sport fish and known for its mottled camouflage pattern.
saltwater
Lyretail Anthias
The lyretail anthias is a small, vividly orange-pink reef fish that forms large, colorful schools over coral drop-offs, with males sporting an elongated lyre-shaped tail.
reef
Giant Grouper
The largest bony fish found on coral reefs, the giant grouper is a massive Indo-Pacific predator with a huge head and mouth, capable of ambushing prey as large as small sharks and turtles.
reef
Hatchetfish
Hatchetfish are small, silvery deep-sea fish named for their laterally compressed, blade-like body and large upward-pointing tubular eyes adapted to detect faint light above.
deepsea
French Grunt
The French grunt is a small, abundant reef fish of the Caribbean and western Atlantic, marked by narrow yellow stripes over a silvery-white body and known for forming dense daytime schools.
reef
Bicolor Damselfish
A small reef fish sharply split into a dark front half and a pale rear half, common on Caribbean and western Atlantic coral reefs where it defends algae-covered territories.
reef
Sprat
A small, slender schooling herring relative found in vast numbers along European coasts, the Sprat is an important forage fish that filters plankton from the water column in dense, fast-moving shoals.
pelagic
Mahi-Mahi
A fast-growing, brilliantly colored open-ocean fish that gathers around floating debris and sargassum, easily recognized by its iridescent blue-green-gold body and long continuous dorsal fin.
pelagic
Kelp Bass
The kelp bass is a mottled olive-brown temperate reef fish closely tied to kelp forests along the eastern Pacific coast, often seen hovering near kelp fronds and rocky structure.
saltwater
Deep-sea Hatchetfish
A small, silvery, laterally flattened deep-sea fish shaped like a hatchet blade, using rows of downward-pointing light organs to mask its silhouette from predators lurking below.
deepsea
Basking Shark
The world's second-largest fish, a massive gray-brown filter feeder recognized by its enormous gaping mouth and huge gill slits, often seen basking at the surface in cool temperate seas.
cartilaginous
Banded Pipefish
The banded pipefish is a slender reef fish patterned with bold reddish-brown and white rings along its entire body, ending in a fan-shaped yellow tail fin marked with a dark spot.
reef