The sturgeons are a very old group of fishes (over 200 million years old) and make up one of the most primitive lineages of bony fishes. Their dinosaur-like bodies match their prehistoric lineage. They are covered with strong bony plates; they have asymmetrical, shark-like tails; and they have barbels off of their long snouts that help in locating their prey. Combined with their extremely large size, the look of the beluga sturgeon can be quite intimidating, but this species is harmless and actively avoids people.
The beluga sturgeon is one of the only species of sturgeons that actively eats other fishes and is one of the largest predatory fishes on Earth. Adult beluga sturgeon have few natural predators, but fishing pressure by people has been very high. The beluga sturgeon is, unfortunately, cursed with producing some of the most desirable caviar in the world. Caviar is the table name for fish eggs, and beluga sturgeon produce millions of eggs. Large individuals have been known to carry several hundred pounds of caviar, and beluga sturgeon caviar can be worth as much as US$3500/pound (US$8000/kilo).
This incredible value combined with the amount of eggs that a single beluga sturgeon can produce makes this species the most valuable fish in the world to fishers. That value may be the beluga sturgeon’s doom. When preparing to spawn upriver, the beluga sturgeon is easy to capture, by harpoon or in nets. Even though it has been given limited legal protection in many areas, its numbers are decreasing everywhere that it lives. It is completely gone from several seas/rivers in which it used to live, and scientists fear that it is critically endangered.
In other words, it is very highly vulnerable to extinction across its entire range. Without further protection and enforcement of existing efforts, we may forever lose one of the biggest, most interesting fishes in the world.