and is the most expensive koi fish ever sold. Koi may just look like an oversized goldfish, but they're not even remotely related. Koi are actually a type of carp, and today they're some of the ...

Koi aren't lightweights either; they typically tip the scales around 35 pounds (16 kg), and experts advise filling a pond ...

Q: I have a pair of goldfish. They are six years old and have a baby that is one. The adults are extremely big—Koi-sized—and have had no health problems so far. Should I take the young fish ...

A Bed-Stuy fire-hydrant-fueled street aquarium that went viral on social media was forced to close due to frigid temperatures ...

District fish biologists removed the large koi which was most likely intentionally released into the McKenzie River. Koi can live up to 25 years, reproduce rapidly, and can survive very cold winters.

The fish, he explained, was a hybrid of a leather carp and a koi carp and after a 25-minute battle, it was all over. The goldfish that had been a white whale to many was in Mr Hackett's net.

The Dubuque Arboretum and Botanical Gardens are seeking funds to upgrade multiple pieces of equipment in their Koi fish pond in the Japanese Gardens.