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.

Planning a home aquarium means choosing fish that is healthy, vibrant, and visually attracting. Many people want an aquarium ...

It's the first rule of the nightclub - and it appears fish adopt it too. When it comes to reeling in a mate, scientists say fish surround themselves with ugly friends - because they look so good by ...

Are you thinking of keeping fish as pets but don’t know where to start? Take a look at two of the most popular choices for beginners - Guppy fish and Swordtail fish. Here are the reasons why these ...

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 ...