Howstuffworks "Freshwater Fish"

Can piranhas really strip a cow to the bone in under a minute?

Ever since Teddy Roosevelt witnessed a piranha feeding frenzy, the fish have been known as fearsome predators. But can they really strip a cow to the bone?

Archerfish

Archerfish, the common name for a family of tropical fish native to the waters of southeastern Asia and northern Australia.

Blackfish

Blackfish, any of several unrelated fish. The Alaska blackfish, found in Arctic and sub-Arctic fresh waters, grows to 7 inches (18 cm) in length.

Bluegill

Bluegill, a freshwater fish of the sunfish group. Bluegills are among the largest of the sunfish, reaching a weight of one pound (454 g) or more.

Buffalo Fish

Buffalo Fish, a North American fish belonging to the sucker family. It is found from Canada to Mexico, chiefly in the lakes and rivers of the Mississippi Valley.

Carp

Carp, the name of a group of freshwater fish. The common, or German, carp is about two feet (60 cm) long and weighs 25 pounds (11.3 kg) or more.

Climbing Perch

Climbing Perch (also called Climbing Gourami and Walking Fish), a freshwater fish that comes out of the water to breathe air for hours at a time.

Crappie

Crappie, a freshwater fish related to the perch and sunfish. It is a popular food fish.

Dace

Dace, a name used for many different species of freshwater fish belonging to the minnow and carp family.

Darter

Darter, the name of a group of small fish of the perch family. Darters swim about in short dashes, propelled by fins on the breast.

Freshwater Sunfish

Sunfish, the common name for a family of mostly small freshwater fish; also the name of a large ocean fish.

Gar

Gar, a freshwater fish having long beaklike jaws armed with sharp teeth. Gars are also known as garfish and gar pikes.

Goldfish

Goldfish, an ornamental fish related to the carp. Goldfish range from 2 to about 18 inches (5 to 45 cm) in length.

Grayling

Grayling, a slender freshwater game fish of the salmon family. The grayling is 12 to 18 inches (30 to 45 cm) long.

Grunt

Grunt, or Ronco, any of several food fish found in tropical and temperate waters.

Lungfish

Lungfish, a fish that breathes with a lung as well as by gills. The African and South American lungfishes use their lungs to breathe air while they estivate (are dormant) in mud in times of drought.