For those new to enjoying caviar, the many types and flavors on the market can be confusing. One that you may find is Russian osetra caviar. What makes this caviar different from other types? It originates from the Russian osetra sturgeon. Since the fish is considered endangered, when you buy Russian osetra caviar online, it typically comes from farm-raised fish instead. Here are some things you should know about serving and enjoying osetra caviar.