Acipenser Baerii (Brandt, 1869)
The Siberian Sturgeon is a medium-sized sturgeon that lives in all the major siberian river basins that drain into the Kara, Laptev and East Siberian Seas, from Ob’ river (which contains 80% of the global population) in the west to Kolyma river in the east. There is a landlocked population in Lake Bajkal, that some consider as a subspecie (A. Baerii Baicalensis).
The shape of the snout is slightly different among the various populations, but it’s generally elongated and pointed. Its mouth is not large and doesn’t reach the edges of the head. The back and sides are dark, from brown to grey, while the belly is usually whitish.
It has 10-12 dorsal scutes, 32-62 lateral scutes per side and 7-16 ventral scutes per side. The scutes are small and have the same color as the skin.
The Siberian Sturgeon is a potamodromous fish, that spends its whole life in freshwater (it rarely goes in the brackish waters of the estuaries) and make just short migrations for spawning from an upstream tributary to a mainstream river or from a lake to its tributaries (like for the Lake Bajkal population). They spawn between the end of May and the end of June.
Seventy-eighty years ago this fish could reach 180-210 kg in weight, especially in the Ob’ river basin, but nowadays it hardly reaches 60-65kg. They can live up to 60 years.
The Siberian Sturgeon feeds on benthic organisms such as crustaceans, molluscs, insect larvae and fish eggs. While looking for food they swallow also a lot of sediment, that can be up to 90% of the stomach content.
The Siberian Sturgeon is listed as ENDANGERED in the IUCN Red List. The stock decline started in the 1930s and is still going on nowadays, with 95-99% of the population lost in these 90 years.This critical decline was caused by overfishing, dam construction (for hydro power) and water pollution. In all populations have been observed abnormalities in the functioning of the reproductive system up to complete sterility, caused by water pollution from mining.
While the wild population is critically declining, the SIberian Sturgeon is increasingly farmed all over the world, for meat, for caviar, for fishing ponds and acquariums.







