And what about Nova vs gravlax? Sushi-grade salmon is fresh, high-quality raw fish that's served as is, while the salmon on your bagel has been cured. Smoked salmon is a preparation of salmon, typically a fillet that has been cured and hot or cold smoked.Due to its moderately high price, smoked salmon is considered a delicacy.Although the term lox is sometimes applied to smoked salmon, they are different products. First thing's first, the raw salmon you eat in your sushi and the raw salmon you eat on your bagel are very different. The Philadelphia roll and New York roll are both examples of sushi rolls that are made with lox. I mean, is there a difference between lox vs smoked salmon? Liquid oxygen—abbreviated LOx, LOX or Lox in the aerospace, submarine and gas industries—is the liquid form of diatomic oxygen.It was used as the oxidizer in the first liquid-fueled rocket invented in 1926 by Robert H. Goddard, an application which has continued to the present. Although lox shares some characteristics of raw fish, its use in sushi preparation is an American invention. This is evident in the names that have been assigned to sushi rolls that include it.