To increase the odds of your koi staying alive for decades, you'll of course want to keep it healthy with properly filtered water and solid nutrition. Make sure the hardy fish is as unstressed as ...

There are regular competitions to name the top koi. Judges and buyers pay attention to how healthy its skin looks, its size and body shape, and how gracefully the fish moves in the water.

Maintaining a healthy environment is essential for koi, as overcrowding can prevent them from reaching their full size and impact water quality, officials said. These fish require ample space ...