Before freezing, the sturgeon needs to be disembowelled, and its internal organs are dug out. Then, the blood in the sturgeon is cleaned with clear water, and after the water on the surface is dried, the sturgeon is sealed in a fresh-keeping bag and placed in the freezer of the refrigerator.
According to their living habits, sturgeons include freshwater fish, marine fish and salty freshwater fish. Acipenser sturgeon exists in the world 1 order, 2 families and 7 genera, only distributed in the northern hemisphere. There are 27 species of sturgeon all over the world, and there are 8 species in China at present, namely, sturgeon Dauricus, sturgeon Sakhalin, sturgeon Dauricus, ACIPENSER sinensis, ACIPENSER schrenckii, ACIPENSER nudus and ACIPENSER Siberia, and these 8 species of sturgeon are mainly distributed in Xinjiang and Heilongjiang.
Introduction of sturgeon species
1, Acipenser schrenckii
It is distributed in Heilongjiang, Wusuli River, Songhua River, etc. It is an animal-eating fish, and occasionally eats aquatic plants when there are few animal foods. Young fish mainly feed on zooplankton, zoobenthos and aquatic insects larvae, while adult fish feed on aquatic insects and aquatic insects larvae, mollusks, benthic crustaceans, octopus larvae, etc., and sometimes ingest small fish.
2. Darwinian carp
It is mainly distributed in Heilongjiang and lakes connected with its larger tributaries, especially in the middle reaches of Heilongjiang. Secondly, it is distributed in Wusuli River and the lower reaches of Songhua River, and it is occasionally found in the lower reaches of Nenjiang River. It is a large carnivorous freshwater fish, and its larvae mainly feed on benthic invertebrates, crustaceans, small fish, shrimps and insect larvae.
3. Sakhalin sturgeon
China is a large carnivorous fish found in the Dongmen River system, and its young fish feed on benthic insects and small fish.