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Description |
Geographic Range [top]
Range Description: This species was known to occur in the Bang River in Cao Bang province in Viet Nam and has been reported in Tay Giang (Kwangsi) in southern China. However its presence in China is uncertain and it may be possibly extinct in Viet Nam.
Countries occurrence:
Possibly extinct:
Viet Nam
Additional data:
? Estimated area of occupancy (AOO) - km2: 50
? Number of Locations: 2
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population:
Before 1975, this species was quite common in Bang River. During the late 1980s and early 1990s, this species was overexploited, and shells were sold to Chinese for making buttons, medicine, handicrafts and pearl cultures. In 2000-2001 and 2007-2010, surveys could not found any specimen of this species, and local people also said that they had not seen this species for long time (V. Do pers. comm. 2011). It is estimated that population has declined at least 80% in the last 30 years, and it may now be extinct.
Current Population Trend: Unknown
Additional data:
Habitat and Ecology [top]
Habitat and Ecology: This species inhabits streams and rivers in midlands and mountain areas. As many other freshwater mussel species, the life cycle of this species is quite complex. Fertilized eggs develop into larvae, called glochidia, in the marsupium of the female mussels. Glochidia, when released from the female, must come in contact with a passing fish and attach to the gills, fins, or body of that fish. These glochidia can only survive on a specific species of fish. If a glochidium attaches to a fish that is not the species it is looking for, it will not survive (McMahon and Bogan 2001). Being host specific can make a mussel extremely sensitive to human impacts.
Systems: Freshwater
Generation Length (years): 15
Use and Trade [top]
Use and Trade: This species was overexploited in Viet Nam, in the 1980s and 1990s, for its thick shell which was used for making buttons in China. In addition to this, local people use freshwater mussels as a ready food source. Therefore, these mussels are often caught and sold in markets.
Threats [top]
Major Threat(s): Overexploitation, deforestation and mining threaten the survival of this species.
Conservation Actions [top]
Conservation Actions: Surveys need to be conducted in Cao Bang, Viet Nam and Tay Giang, China to obtain information on the population, distribution and ecological requirements of this species. Conservation actions which are needed include protection of its important habitats from direct and indirect impacts, and preventing exploitation of this species.
Citation: Do, V. 2011. Lamprotula crassa. The IUCN Red List of Threatened Species 2011: e.T171843A6806433. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T171843A6806433.en. Downloaded on 04 May 2018.
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