Guppies can be fooled by optical illusions into believing objects are smaller or larger than they really are. This suggests they might not always make the best choices in their natural environment.

Tiny fish called Trinidadian guppies turn their eyes black to warn other fish when they are feeling aggressive, new research shows. Tiny fish called Trinidadian guppies turn their eyes black to warn ...

We specialize in freshwater tropical fish, aquatic plants, and the overall betterment of the freshwater fish keeping hobby. Our goal is to help you with your first pet fish and graduate you to an ...

How people respond to stressful situations can say a lot about their personalities—and it turns out the same is true of a little fish called the Trinidadian guppy. That's according to a study ...

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 that ...

A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it's not like human sleep. Giordano Cipriani/The Image Bank via Getty Images From the goldfish in your ...

Not the kind you might have in your house, but more like an oceanarium. This aquarium is filled with gigantic, impressive ...

Tiny fish called Trinidadian guppies have individual 'personalities', new research shows. Scientists from the University of Exeter studied how guppies behaved in various situations, and found complex ...

When Robert Heathcote dips his head into the rivers of Trinidad, he’ll often see little black dots moving through the water, even when it’s murky. Those dots are the eyes of small, inch-long fish ...