Guppies are beginner-friendly, low-maintenance fish that thrive in a 10-gallon tank, with a peaceful temperament and omnivorous diet. Males are smaller with vibrant colors, while females are ...

The guppy studied is the tiny fish in the bottom-left corner. Also shown are the two predators researchers used to stress the guppy out: a heron and a blue acara cichlid. The guppy studied is the ...

Mosquitofish and guppies, though known to be cannibalistic in captivity, are extremely unlikely to be cannibals in wild settings, and the rare instances of cannibalism in these fish are likely due ...

A prize-winning guppy will encapsulate those features as well as any fish can, though a truly excellent best-of-show fish would receive only 85 to 90 points.

These fish are a far cry from the guppies you see in a pet store. Those are colorless creatures the kind you buy 10 for a dollar that bigger fish like to eat.

Guppies have menopause, too A new study finds that guppies experience menopause just like humans and other animals, the first such discovery in fish.

A new study has shown that some fish have more complex personalities than was previously thought. Scientists at the University of Exeter studying the behavior of Trinidadian guppies discovered ...

The fish are more often thought of as aquarium pets in the U.S. and, in their native Trinidad, wild guppies are so ubiquitous, they're almost taken for granted. "In Trinidad, they're called drain ...

The way guppy fish behave suggests they can be tricked into believing holes are larger or smaller than they really are – but they don’t always interpret the optical illusions in the same way ...

Guppies have silver eyes, but when they’re ready for a fight, their irises go dark. An experiment with robots shows why.