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.
Banggai Cardinalfish
The Banggai Cardinalfish is a striking silver-and-black fish with long trailing fins and bold white spots, native to a tiny area of Indonesia and listed as Endangered in the wild.
reef
Pyjama Cardinalfish
A small, boldly patterned reef fish with a yellow-spotted rear half, a dark bar through the eye, and large eyes suited to nocturnal feeding. It shelters among coral branches and sea urchin spines by day.
reef
Pajama Cardinalfish
A small, egg-shaped reef fish with a yellow-striped head and red-spotted rear body, resembling patterned sleepwear.
reef
Glass Knifefish
A slender, near-transparent South American fish that swims using a continuous rippling fin and emits a weak electric field to sense its surroundings.
freshwater
Glass Catfish
A small Southeast Asian catfish with an almost fully transparent body that reveals its skeleton and internal organs.
freshwater
Kryptopterus
A small, almost entirely transparent Southeast Asian catfish whose internal skeleton and organs are visible through its glass-like body, popular in the aquarium trade.
freshwater
Bay Anchovy
One of the most abundant fish in Atlantic and Gulf Coast estuaries, the tiny Bay Anchovy is a key forage species that tolerates a wide range of salinities from open bays to nearly fresh tidal creeks.
brackish
Aiptasia-eating Filefish
A small, drab Indo-Pacific filefish prized in reef aquariums for its habit of eating Aiptasia glass anemones, blending into seagrass and algae with mottled camouflage.
reef
Barreleye
The barreleye, or spookfish, is a deep-sea fish with a transparent, dome-shaped head revealing barrel-shaped, upward-rotating tubular eyes, unlike any other fish.
deepsea
Walleye
A slender, golden-olive freshwater predator named for its large, glassy, light-reflective eyes that give it excellent low-light vision for hunting at dusk and in murky water.
freshwater