Sturgeon roe can still be alive when taken out. A method for preparing roe by taking eggs in vivo is used. When the ovaries reach the fourth stage of development, luteinizing hormone releasing hormone analogues are injected. After the ovaries are free, the fish are anesthetized and laparotomy is performed to take eggs.

Sturgeon inhabits the middle and lower layers of water, and the migratory and river-settled species of Haihe River move to the upper reaches of the river during spawning. In winter, it is mostly in rivers or deep waters near the shore, and generally eats plankton in the larval stage.

In the juvenile stage, benthic aquatic oligochaeta, aquatic insects, small fish, shrimp and molluscs are the main foods. In the adult stage, they eat zoobenthos or animal and plant dregs, while the shovel sturgeon still eats plankton.

Extended data:

Distributed in the northern hemisphere, there are nine natural distribution areas: Great Lakes region of North America, Northwest Atlantic, Mississippi River basin and Gulf of Mexico in North America, Northeast Atlantic, Caspian Sea region, Siberia and Arctic Ocean basin, Heilongjiang and Sea of Japan, Yangtze River and Pearl River.

There are 7 species of wild sturgeon in China, including sturgeon schrenckii, bighead carp and sturgeon Sakhalin, which are distributed in Heilongjiang, Songhua and Wusuli rivers. ACIPENSER sinensis and ACIPENSER davidii distributed in the Yangtze River and Jinsha River basins;

Up to now, China has introduced more than a dozen species from abroad, such as Russian sturgeon, European herring, small sturgeon and paddlefish, for research or artificial breeding.