Sevruga sturgeon (A. stellatus, A. ruthenus) has smaller eggs than beluga or osetra (1.7 to 2.7mm) but its maturity and reproduces is the quickest. It is found in more abundance than the other two and it also comes at a less expensive price. The color is light gray to dark grey and gray black with a fine grain and have the strongest flavor of all sturgeon eggs. The egg of starry sturgeon is larger than starlet sturgeon.
One of the benefits of starry sturgeon (A. stellatus) compared to other sturgeon species is its shorter lifetime, resulting in a shorter maturity and a faster reproductive rate. It grows in the breeding environment at the age of 5 to 6 years, at an average weight of 9 to 12 kg and a size of about 120 cm and the ratio caviar to meat in this fish reaches 12 to 18 percent.
According to Berg (1948), in South Caspian Uzun-burun, males mature at the age of 11-13 and females at the age of 14-17.
In breeding farms, with good management, environmental and nutritional conditions, sterlet (A. ruthenus) females mature to be 3 to 4 years old, weighing 1 to 4 kg and total length of 60 to 80 cm and their caviar can be obtained. Their egg laying in this condition is 12 to 17 percent of their body weight.
In the wild, the weight of a sterlet is up to 16 kg and its length reaches 100 to 125 cm. Under normal conditions the males mature at the age of 3 to 7 and females at the age of 4 to 12 and the appropriate temperature for spawning is 12 to 17 ° C. (Month of May)