Originally, sturgeon glue was made out of the bladder of the sturgeon. These fish were caught in the rivers flowing into the Caspian Sea and the Black Sea. Meanwhile, bladders of various other fish, mainly from India and Brazil, are also called sturgeon glue!
In the places of origin, the bladder is taken out of the sturgeon, cut lengthwise and dipped into hot water. The outer muscle layer and blood is then removed and put up for drying.
The largest amount of native collagen show bladders from caviar fish, which qualitatively are the best. This quality is called Salianski sturgeon glue. Sturgeon glue has been used by Russian restaurators for consolidation and as glue for a long time. Sturgeon glue has a higher adhesion and lower viscosity than comparable animal products, such as gelatin or rabbit skin glue.