Their cells can be red, yellow, black, white, blue ... and is the most expensive koi fish ever sold. Koi may just look like an oversized goldfish, but they're not even remotely related.

The black coloring (sumi ... and they became one of the most prized types of koi fish. They’re available for as low as $70, ...

The nation’s top koi aficionados will bring their most spectacular fish — up to 3 feet long — to South San Jose to compete ...

In the digital age, the art of aquarium keeping is evolving, powered by innovation, advanced breeding science, and ...