Yep, triploid. Washington state record for rainbows was broken when I lived there, it was an escaped triploid from a fish farm, hung around the nets eating fish food until one day it made the mistake of moving down lake and got caught.
There's a private man made lake in Texas where they feed the bass some kind of giant shrimp and they hope to get a world record there. People can pay to fish there, but it is really expensive. I'm not a big fan of a feeding operation to raise record fish myself, but it is what it is.