Guppies are tiny, easy-care fish that grow up to 1.6 inches (4 centimeters) long. They like to live with other guppies and are social, active fish. Males are known to harass females, so it’s ...

Covered in a bony carapace, this fish has a square, rigid body that gives it a distinctive appearance. Its body is often brightly colored, with a range of patterns from polka dots to stripes.

Zebrafish are unassuming and undemanding. Almost every child knows that – at least any child that has kept fish in an aquarium. Since the beginning of the 20th century, these fish have been one of the ...