What type of fish does caviar come from?

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Depending on who you ask, caviar is defined as the roe (eggs) of specific types of sturgeon, or as the roe of most any fish. Purists insist that only Beluga Sturgeon, Osetra (or Asetra or Ossetra) Sturgeon, and Sevruga Sturgeon produce true caviar. Certainly, these fish are the source for the most expensive and rare caviar. But many companies sell caviar harvested from a variety of fish, although they usually either specify the fish (as in "Salmon caviar") or call the final product "American" or "domestic" caviar. Sturgeon evolved some 250 million years ago, and they retain many prehistoric characteristics, such as bony plates on their skin and long, toothless snouts. There are about 50 species of sturgeon, and the Beluga, Osetra, and Sevruga are all found in the <a hr more
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