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, ...

Powdered fish meals that farms use are also becoming ... They believe that feeding koi black soldier fly larvae may enhance their white blood cells’ ability to ingest pathogens, and that ...