Some Fish Are Braver Than Others: Guppies Have Complex Personalities Under Stress. Published Sep 25, 2017 at 12:30 PM EDT Updated Sep 25, 2017 at 12:50 PM EDT.

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 ...

An international team of biologists, led by Wageningen University & Research, has demonstrated that predators have a direct ...

Guppies are a small, pretty species of fish that are extremely popular for home aquariums. While they’re fun in captivity, in the wild they can cause major trouble.

In other words, the guppies were going through a fish version of menopause. David Reznick, a biologist at UC Riverside, and colleagues compared the life history of 240 guppies taken from mountain ...

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...

The fish themselves cost as little as $0.10 each at pet stores (or as much as $25 for fancy guppies), the flaked food they require is inexpensive, and if you pick up a used tank and filter, you ...

Guppies have silver eyes, but when they’re ready for a fight, their irises go dark. ... Those dots are the eyes of small, inch-long fish called guppies. And those guppies are angry.

Hailing from the marshes and rice paddies of Southeast Asia, betta fish are primarily known for two things: their gorgeous, ...

Guppy fish in an aquarium (Image: Getty) They found that food patches defended by black-eyed robots attracted more competition from larger real guppies - especially those with blacker-coloured eyes.