How much is Koi fish?
It is also true that certain varieties of koi are more expensive than others. A high-quality 6-inch (a white fish with large red patches) may cost $3000. A high-quality oghon (basically a golden, metallic-colored fish) of the same size may cost $100.
How long does the average koi fish live?
The short answer is they can live over 200 years. The oldest known Koi was Hanako who lived to be 226 years. But the reality is most Koi do not live anywhere close to that long.