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 Parrotfish
An entirely blue Caribbean parrotfish, with large adult males developing a bulging forehead snout.
reef
Blue Tang
A vivid royal-blue reef fish with a black palette-shaped marking and a bright yellow tail, popularized worldwide after appearing in animated film.
reef
Blue Acara
A hardy, adaptable South American cichlid with iridescent blue-green spangling, popular in aquariums for its calm temperament and manageable adult size.
freshwater
Blue Marlin
A massive, cobalt-blue billfish with a long spear-like bill, the Blue Marlin is one of the fastest and largest predators of the open tropical ocean.
pelagic
Blue Ling
A slender, deep-water relative of the cod, the Blue Ling lives along northeastern Atlantic continental slopes and forms dense spawning aggregations at specific deep-sea sites.
deepseaBlue Gularis
One of the largest African killifish, males display an elongated lyre-shaped tail and vivid blue-green body with red barring, native to Nigerian and Cameroonian wetlands.
freshwater
Blue Shark
A slender, wide-ranging oceanic shark with a striking indigo-blue back, long pointed pectoral fins, and large eyes, found throughout temperate and tropical open oceans worldwide.
cartilaginous
Fiji Blue Devil
A striking blue-headed, yellow-bodied damselfish endemic to the coral reefs of Fiji and nearby South Pacific islands.
reef
Blue-spotted Stingray
A small, brilliantly patterned stingray common on Indo-Pacific coral reefs, instantly recognizable by its electric-blue spots and blue-striped tail.
reef
Blue Green Chromis
A small schooling damselfish with iridescent blue-green coloring, commonly seen in large groups hovering above branching coral on Indo-Pacific reefs.
reef
Steel-blue Killifish
A small, brightly colored West African killifish with a metallic blue body, red spotting, and an elongated lyre-shaped tail. It inhabits swamps and forest streams in Nigeria and Cameroon.
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
Pacific Blue-eye
A tiny, schooling fish common in coastal streams and estuaries of eastern Australia, easily recognized by its reflective, luminous blue eyes.
brackish
Electric Blue Hap
One of the most vividly colored Lake Malawi haplochromine cichlids, males display an intense electric-blue body that makes this predatory species a standout among the lake's rock-dwelling cichlids.
freshwater
Blue-spotted Shark
A small, slender nocturnal reef shark covered in vivid blue spots and dark saddle bands, popular in home aquariums.
reef
Blue Ring Angelfish
An Indo-Pacific angelfish named for the vivid blue ring behind its head, with adults displaying a yellow-brown body crossed by curving electric-blue lines.
reef
Powder Blue Tang
A vivid powder-blue surgeonfish with a black facial mask and white throat patch, common on shallow reef edges across the Indian Ocean.
reef
Blue Reef Chromis
A slender, brilliant blue schooling fish commonly seen hovering in large numbers above coral reef outcrops throughout the Caribbean and western Atlantic.
reef
Atlantic Blue Marlin
A massive, powerful billfish of the open Atlantic, known for its cobalt-blue back, silvery flanks, and a long spear-like bill used to stun prey.
pelagicGreen Chromis
The Green Chromis is a small, shimmering blue-green damselfish that forms large schools hovering above branching coral heads on Indo-Pacific reefs.
reef
Twinspot Wrasse
A large Indo-Pacific wrasse; juveniles are white with two red-and-black spots, while old males become bulky and greenish with a forehead hump.
reef
Ember Parrotfish
The vivid orange-red juvenile color phase of the Redlip Parrotfish, prized in the aquarium trade for its fiery hue before it transforms into a much larger blue-green adult.
reef
Sergeant Major
A common silvery damselfish marked with five bold black vertical bars, resembling military rank stripes, found on shallow tropical reefs.
reef
Spotfin Croaker
A robust surf-zone drum from Southern California and Baja, easily identified by a bold black spot at the base of each pectoral fin.
saltwater