Sturgeon: sand wax, commonly known as the small wax, sturgeon, Huso dauricus.
Body length assumes shuttle shape. Head wedge-shaped, back rough. Kiss the short front tapering. Mouth inferior, transverse cleft, lip with small mastoid. Kiss out for 2. Small eyes (a Chinese sturgeon is relatively large). The nostrils, gill holes are large. Opercular membrane and isthmus. Separation of left and right gill holes. The body was 5 rows of bony hard scale, rough inter epidermal rough. Tail distortion. Similar to the Chinese sturgeon, but adult body length is shorter, lighter weight. Gill rake triangular slice, 33-54 pieces. Body back and side face. Ventral gray. Fins bluish gray, margin white.
Sturgeon is a freshwater fish settled. Often lower in the rivers, in the lower reaches of the Yangtze River above Hubei city to Jinsha River Changsha is common, also entered the large lakes. Youxi inhabits with slow flow, rich humus and benthic sandy bottom or gravel moraine dam in Deep Bay or tuo. Yangtze River tributaries and large lakes along Yangtze river.
Faster growth rate. Reproductive population male 4-7 age, female 5-8 age reached sexual maturity, general body length 0.8-1.0 m, weight 5-10 kg. Spawning season in 10-11 months, a few extended to December. Mature individuals in the breeding season back to the main river upstream, spawning rivers, eggs sinking and adhesion. The egg adhered to the bottom of gravel beach in spawning ground. The feeding habits were mainly invertebrate invertebrate movement, aquatic plants, algae and humus. Juvenile to Oligochaeta, dragonfly larvae, Diptera larvae, chironomid larvae and small fish for food; large juvenile and adult fish on humus and benthic invertebrates for food. The spawning period generally indigestion.
Produced in the upper reaches of the Yangtze River large economic fish, natural production is not large, but in the production of Fisheries still occupy a certain position. Over the past twenty years, the number greatly reduced, in an endangered state. The upper reaches of the Yangtze River has been the attention, and also subject to effective protection of Chinese sturgeon.