Koi carp are one of the most iconic ornamental fish in the world. Originally hailing from Japan, these beautiful fish have amazingly patterned bodies. There are many varieties–– and some of them are ...

Goldfish (Carassius auratus) and koi (Cyprinus rubrofuscus) are common ornamental fish that can pose significant harm to aquatic ecosystems when released into the wild. Goldfish and koi are native to ...

Once a simple food fish, koi have transformed into living jewels, with some fetching sky-high prices in the global luxury market. Here's how this happened.

The winners of the British Wildlife Photography Awards 2025 have been unveiled with Simon Withyman chosen as the 2025 grand ...

Aggression is a normal part of fish behavior. They often fight to establish territory and hierarchy – and this behavior is ...