Chinese sturgeon
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A. sinensis
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| Acipenser sinensis J. E. Gray, 1835
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The Chinese sturgeon (Acipenser sinensis; Chinese: 中华鲟; 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.[1]
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.[1]
Contents
Physical appearance
Sturgeon are comparatively basal species of fish, whose earliest fossils date back to the Cretaceous period.[2] 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.
Adult Chinese sturgeon can range between 200 and 500 cm (79 and 197 in) in body length, and weigh between 200 to 500 kg (440 to 1,100 lb), ranking them among the largest sturgeon in the world.[3] Its head is acuminate, with the mouth under its jaw.[4]
Lifecycle
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,[5] 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.[6] The sturgeon's reproductive capacity is poor; it 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 to hatching is estimated to be less than 1%.[5]
Habitat
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.[4] Most aquatic animals are food for the young of the Chinese sturgeon, while the adults feed on aquatic insects, larvae, diatoms, and humic substances.[4]
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[7] 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.[6]
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.[6]
Protection and research
The primitiveness of the Chinese sturgeon makes it a great academic interest in taxonomy and biology. For this reason, China has been studying ways to breed and preserve the endangered species, classified as "China's Class One Protected Animals" since the 1970s.[2]
Built in 1982, the Chinese Sturgeon Museum is part of the Chinese Sturgeon Institution of China which is using artificial breeding techniques to try to preserve this endangered species. The museum is located on a small island called Xiaoxita in the Huangbo River, within Yiling District of Yichang.[8]
Repopulation program
The Yangtze River Fisheries Research Institute of the Chinese Academy of Fisheries Sciences in Jingzhou is one agency charged with breeding sturgeon in captivity for restoring the river population before the species disappears.[6]
Some success has been claimed by the authorities from artificial inducement for spawning and stream discharge for incubation.[4] On 29 April 2005, to mark the 20th anniversary of the China's efforts to protect the species, over 10,000 sturgeon fry, 200 junior sturgeon, and two adult fish were released into the Yangtze River at Yichang. During the course of the project, 5 million fish bred in captivity have been released into the wild.[7] However, in 2007, 14 young sturgeon were surveyed near the mouth of Yangtze compared with 600 the year before, causing concern that effort was a losing battle in the crowded and polluted Yangtze river.[9]
To mark China's hosting the Olympic Games, the Chinese Central Government made a gift of five sturgeon, symbolising the five Olympic rings to Hong Kong. The fish made their debut in Ocean Park Hong Kong on 20 June 2008.[2] One of the fish, however, died by January 2009 due to unknown causes.
See also
References
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 6.2 6.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Chinese Sturgeon Museum
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
