What Type Of Fish Lasts The Longest?

there's  documentation of some Koi living over 200 years... But it all has to do with the care...most fish don't die of old age... They die because it's difficult to provide continuous optimum conditions in captivity. 
I'm not a fish person anymore... But I recall having a Betta when I was a kid that I think I had for a long time... I also had a mollie that I remember lived for a Long time after all the other fish in the tank went belly up... Now the only fish I have are in my backyard pond.. I started out with 7 cent feeder fish.. And now 7 or 8 years later they're about 8 to 10 inches long, and I only feed them about twice a week!