It is illegal to sell this whitefish's meat in Japan and Italy, and the US FDA does not recommend it. It is Lepidocybium flavobrunneum, aka Escolar, "waloo waloo", or snake mackerel. Instead of fat, the fish produces waxy flesh
Indigestible wax, eating it causes instant diarrhea
It is occasionally mislabeled as "white tuna" or "butterfish" due to its fatty flesh but because we cannot digest the waxy esters in its flesh, it causes Keriorrhea which is a fancy name for the kinda of oily orange diarrhea caused by this waxy fish and its relatives.