The Chinese sturgeon (Acipenser sinensis; Chinese: 中華鱘; pinyin: zhōnghuá xún) is a critically endangered member of the family Acipenseridae in the order Acipenseriformes. Historically, this anadromous fish was found in China, Japan, and the Korean Peninsula, but it has been extirpated from most regions due to habitat loss and overfishing.
It is strictly protected by the Chinese government, named a "national treasure" much like its mammalian counterpart, the giant panda. China has several conservation programmes, including reserves specifically aimed at this species and restocking through release of juveniles in the Yangtze River.
Sturgeon are comparatively basal species of fish, whose earliest fossils date back to the Cretaceous period. They are best-known members of the bony fish taxon Chondrostei, a group of bony fishes that have cartilaginous skeletons superficially similar to the skeletons seen in the unrelated chondrichthyan fishes. In Qing dynasty Chinese cuisine, its meat and cartilaginous skeleton was often cooked and served together, and considered a delicacy.
Adult Chinese sturgeon can range between 2 and 5 m (6.6 and 16.4 ft) in total length, and weigh between 200 and 500 kg (440 and 1,100 lb), ranking them among the largest sturgeon in the world. Its head is acuminate, with the mouth under its jaw.
The Chinese sturgeon is a critically endangered species native to China. It is largely dispersed over the main streams of the Yangtze River and coastal regions of Qiantang River, Minjiang River, and Pearl River. The adults are predators that consume any aquatic animal that can be swallowed, while the young feed on aquatic insects, larvae, diatoms, and humic substances.
In the 1970s, an estimated 2,000 Chinese sturgeon spawned in the Yangtze River every year. Now, that number is down to several hundred due to the threats to its habitat, such as pollution and other human action. The channel for adult fish migrating to traditional spawning sites such as the Jinsha River in the upstream of Yangtze River was blocked after the construction of the Gezhouba Dam hydroelectric power project in the early 1980s.
The Yangtze River Fisheries Research Institute of the Chinese Academy of Fisheries Sciences, the Institute of Hydrobiology of the Chinese Academy of Sciences, the Institute of Hydro-ecology of the Ministry of Water Resources of China, and the Chinese Sturgeon Research Institute of the Three Gorges Group have been collaboratively monitoring Chinese sturgeon spawning since the 1980s. However, from 2013 to 2014, no new spawning activity was detected and led to the belief that the Chinese sturgeon was near extinction. In 2015, juvenile Chinese sturgeon were found and showed that the Chinese sturgeon had relocated their spawning area in the Yangtze River after suspending spawning for a season.
The sturgeon is also highly sensitive to increased noise on the river caused by growing river traffic, as well as being vulnerable to death or injury by boat propellers.
Most sturgeon spawn in fresh water and migrate to salt water to mature. The Chinese sturgeon can be considered a large freshwater fish, although it spends part of its lifecycle in seawater, like the salmon, except Chinese sturgeon spawn multiple times throughout their lives.
The Chinese sturgeon has a habit of upstream migration; it dwells along the coasts of China's eastern areas and migrates back up rivers for propagation upon reaching sexual maturity. It has the longest migration of any sturgeon in the world, and once migrated more than 3,200 km (2,000 mi) up the Yangtze. The sturgeon may breed three or four times during its life, and a female sturgeon can carry in excess of a million eggs in one cycle, which are released for external fertilisation when mature. The survival rate of hatchings is estimated to be less than 1%.
The Chinese Sturgeon will migrate from the mouth of the Yangtze River to the spawning ground and the female Acipenser Sinensis will stay there for a year to prepare for spawning activities, and then all Acipenser Sinensis will migrate to the lower middle and upper layers for spawning activities and female Acipenser Sinensis leave earlier than male Acipenser Sinensis. Changes in the water temperature of the Yangtze River will delay the spawning time of Acipenser Sinensis, and may lead to the degeneration of gonads.
