For example, there are koi with light blue spots, ones with large red patches on their backs, or all-metallic gold. But the most winning fish often just boil down to these three varieties.

Did you know some species of pet fish can live as long, if not longer, than dogs and cats? Learn how this wonderful species ...

Koi are pretty big fish that require a lot of space (the "big fish, small pond" thing doesn't work for them). With the right care, koi can grow to be between 2 and 3 feet (0.6 and 0.9 meters ...