What is the name of the most expensive type of caviar, derived from a specific species of sturgeon?

The most expensive type of caviar is Beluga caviar, which is derived from the beluga sturgeon, one of the largest and longest-living sturgeon species. The beluga sturgeon is primarily found in the Caspian Sea and is known for its large eggs, which are prized for their delicacy and rich flavor. The rarity of the beluga sturgeon, combined with the lengthy production process and ecological pressures from overfishing, contributes to the high market price of Beluga caviar. This particular caviar is considered the gold standard in the culinary world, often sought after for its luxurious taste and texture.

Other types of caviar such as Sevruga and Osetra are also considered gourmet delicacies, but they do not command the same premium price as Beluga due to factors such as the size of the fish, the number of eggs produced, and their availability. Asetra is not a recognized type of caviar and seems to be a misspelling or misinterpretation, which further clarifies why Beluga is identified as the most expensive type.