UPDATE OMG THEYRE NOT KIDDING, IT'S REALLY PATAGONIAN TOOTHFISH. At first I tot their translation is wrong due to the price. Patagonian toothfish at 17bucks is an absolute steal!!!! It sells for 60+ a plate at upscale restaurants. Given the texture though I'm not surprised, ridiculously fatty. MUST TRY!!!!!!!! This translation is definitely accurate, I checked w my Japanese teacher

GOOGLE SAYS GROUPER, but
the stall translate as toothfish, which is probably wrong?? It's definitely not silver cod tho, that is gindara

The first mouthful was absolutely life changing. If there's a fish equivalent of A5 wagyu, this is it. It melts in your mouth, quite literally. So incredibly fatty and cloud-like, but the oil does get jelat after a while. The sweetness of the saikyoyaki pairs q well with the fish, though after a few bites there's a bit of bitter aftertaste, which combined with the fattiness of the fish, makes it jelak. Get this to share, and you'll be very, very happy. I didn't queue for this but I imagine it would be worth the 20-30mins queue. Must try!