Today July 18, 2014 is National Caviar Day Caviar is a delicacy consisting of salt-cured fish-eggs. Depending on the country, caviar may also be used to describe the roe of other fish such as salmon, steelhead trout, trout, lumpfish, whitefish, and other species of sturgeon. Caviar is considered a delicacy and is eaten as a garnish or a spread.