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.
Blue Damselfish
A small, brilliant electric-blue damselfish that fiercely defends its patch of shallow Indo-Pacific reef.
reef
Yellowtail Blue Damselfish
A small, vividly electric-blue damselfish with a sharply contrasting bright yellow tail, common on shallow reef flats and lagoons of the western Pacific.
reef
Blue Devil Damselfish
A small, intensely electric-blue damselfish common on shallow Indo-Pacific reef flats, with males developing an orange-tinted tail during breeding season.
reef
Three-Spot Domino Damselfish
A round, jet-black damselfish marked with three white spots, commonly seen sheltering among sea anemones and branching corals on Indo-Pacific reefs.
reef
Domino Damselfish
A hardy black damselfish marked with three bold white spots as a juvenile, named for its resemblance to a domino tile.
reef
Yellowtail Damselfish
A dark, deep-bodied Caribbean damselfish with a bright yellow tail, known for aggressively farming algae gardens.
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
Springer's Damselfish
A small, dramatic black damselfish with two vivid electric-blue stripes running along the top of its body, found on shallow reefs of the Philippines and Indonesia.
reef
Azure Damselfish
A small, vividly blue damselfish common on Indo-Pacific reef flats and lagoons, easily spotted flitting among coral rubble in loose groups.
reef
Neon Damselfish
A small, brilliant iridescent blue damselfish with a touch of yellow on the tail, commonly seen in loose groups over rubble and coral on Indo-Pacific reefs.
reef
Allen's Damselfish
A slender, iridescent blue damselfish with a bright yellow tail, native to reefs of the Coral Triangle and known for its striking two-tone coloration.
reef
Talbot's Damselfish
A small damselfish with a yellow head, a pale lavender-grey body, and a distinctive black spot on the rear dorsal fin, found sheltering among branching coral on western Pacific reefs.
reef
Yellowbelly Damselfish
A small blue-grey damselfish with a bright yellow underside, found sheltering around coral and rubble on shallow reefs of the western Pacific.
reef
Spot Croaker
Spot is a small, deep-bodied estuarine fish easily identified by a single dark shoulder spot and faint oblique bars along its upper body.
brackish
Humbug Damselfish
A small white damselfish marked with three bold black bars and a clear tail, living in tight groups among the branches of Indo-Pacific coral colonies.
reef
Fourstripe Damselfish
A white damselfish marked with three bold black bars plus a black tail, forming a four-banded pattern as it hovers around branching coral on Indo-Pacific reefs.
reef
Blue Gourami (Three Spot Gourami)
A hardy, adaptable Southeast Asian labyrinth fish named for the two dark spots along its flank that, combined with the eye, form a "three spot" pattern; the wild form is blue-grey with darker mottling.
freshwater
Two-spot Goby
A small sand-dwelling goby known for the two large false eyespots on its raised dorsal fin, which mimic a crab's eyes to startle predators.
reefTwo-spot Red Snapper
The two-spot red snapper, or bohar snapper, is a large, deep red Indo-Pacific reef predator, sometimes showing two pale saddle spots on the back, and an important predator on coral reef slopes.
reef
Blue Catfish
North America's largest catfish species, silvery-blue to slate gray with a deeply forked tail, native to the Mississippi basin and now established as an invasive predator in several Atlantic drainages.
freshwater
Blue Whiting
Blue whiting is a slender, silvery-blue deep-water relative of cod that forms enormous schools across the northeastern Atlantic, distinguished by its large eyes and lack of a chin barbel.
pelagic
Blue Rockfish
A schooling rockfish with dark blue-gray coloring, commonly seen in large numbers around kelp forests and rocky reefs along the Pacific coast of North America.
saltwater
Blue Runner
A slender, greenish-blue jack common along the western Atlantic coast, often called the hardtail and known for its schooling habits and role as forage for larger predators.
pelagic
Blue Skate
One of the largest skates in the northeast Atlantic, now rare and heavily protected after historic overfishing collapsed its populations across much of its former range.
cartilaginous