Iranian Dice Fish: Currently it is considered an independent species, but earlier it was considered a subspecies of Russian fish. "Qaraburun" means "black nose" in Turkish, which has the second rank of value. Currently, due to artificial reproduction, it has surpassed the Russian species from the point of view of abundance. It is bigger than the Russian species and has the superior quality of sturgeon. In terms of appearance, they are somewhat similar, although a darker color with white pigments that continue to the nose separates it from the Russian fish. It has a weight of 60 to 130 kg and a length of 1 meter to more than 2 meters, which matures between 12 and 14 years of age.​​​​​​