Betta fish come in many colors including steel blue, royal blue, and turquoise blue. Cichlids also come in quite a diverse range of colors. Some blue varieties include the Peacock Cichlid ...

Jewel cichlids are equally as aggressive and territorial as Oscars, and they prefer to prey on smaller fish that they can fit into their mouths. The blue acara is a type of freshwater cichlid with ...

A community of rare fish enthusiasts collects endangered species of freshwater fish from lakes and springs around the world, ...

Both the cichlids and the stingrays chose correctly ... This wasn’t the case: after the fish saw three blue shapes, they swam toward an image showing four blue shapes, rather than one showing five—a ...