I ran across a seafood supplier with some frozen yellowfin tuna loins at $4 a pound. Seemed worth an experiment.
They suggested having a fishmonger break it down for a fee. If DIY, then cut it frozen with a stainless steel knife (In contrast, I assume, with the alloys used in forged knives?).
So I have a 9 lb boneless tuna loin. I’m not going to eat that much sashimi. Other ideas? Precautions in processing? Any reasonable way to dry age without one of those specialized chambers?