The best caviars in the world might come from the Caspian Sea, but freshwater caviar is giving these old standard a run for their money. The increasing extinction of the Caspian sturgeon species, plus the increasing prices has driven innovative gourmands to look elsewhere for their delicacy, and they've found it in the myriad lakes and rives around the world. Some of the most popular sturgeon caviars in the market, like Paddlefish and Hackleback, are freshwater caviar, raised and harvested along American rives and lakes.