(Acipenser Transmontanus) American osetra is the largest freshwater fish in North America and the third largest species of sturgeon. This osetra grow up to 20 feet long and can weigh up to 1200 pounds. It is a native of the west coast of North America the caviar can only be harvested from farm raised Sturgeon. Rated one of the best caviar in the New York Times. The caviar eggs are medium to large size. The color runs from brown to black caviar has an intense aroma, and unmistakable flavor similar to Russian osetra.