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.
Molly
A hardy, adaptable livebearer native to Mexico and Central America, the common molly thrives in fresh, brackish, and even marine water and is one of the most popular beginner aquarium fish.
freshwater
Yucatan Molly
A large sailfin livebearer native to the coastal waters of the Yucatan Peninsula, known for the male's dramatically tall, sail-like dorsal fin used in courtship.
brackish
Black Molly
A solid-black, selectively bred color strain of the common molly, the black molly is one of the most recognizable and widely kept aquarium livebearers.
freshwater
Balloon Molly
A selectively bred molly variety with a distinctive rounded, ball-shaped body caused by a spinal curvature, developed and maintained through aquarium breeding.
freshwater
Shortfin Molly
A hardy, adaptable livebearer native to Mexico and Central America, prized in the aquarium trade for its tolerance of varied water chemistry.
freshwater
Sailfin Molly
Named for the male's spectacular, sail-like dorsal fin, this coastal livebearer from the southeastern United States and Mexico is a striking sight in brackish marshes and aquariums alike.
brackish
Amazon Molly
An entirely female species that reproduces through a rare cloning-like process, the Amazon molly is a biological curiosity native to rivers along the Texas-Mexico border.
freshwater
Molly Miller Blenny
A hardy little blenny that perches motionless on shallow rocks in tropical Atlantic tide pools, easily recognized by the fringed tentacles above its eyes.
saltwater
Gold Dust Molly
A selectively bred molly variety combining a golden-yellow base color with fine black speckling, developed in the aquarium trade from wild Poecilia stock.
freshwater
Mola Mola
The heaviest bony fish in the world, an enormous, flattened, disc-shaped giant that appears to be missing a tail, often seen basking sideways at the ocean's surface.
pelagic
Warmouth
A stocky, big-mouthed sunfish with red eyes and dark cheek streaks, at home in weedy, sluggish waters and swamps of the eastern United States.
freshwater
Ocean Sunfish
The ocean sunfish is the heaviest bony fish alive, a flattened giant with no true tail that drifts through temperate and tropical seas feeding on jellyfish.
pelagic