Yangtze sturgeon (Acipenser dabryanus)

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Yangtze sturgeon in conservation project
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Yangtze sturgeon fact file

Yangtze sturgeon description

KingdomAnimalia
PhylumChordata
ClassActinopterygii
OrderAcipenseriformes
FamilyAcipenseridae
GenusAcipenser (1)

A prehistoric-looking fish, the Yangtze sturgeon has a long and slender body covered with rough skin and bony plates. A pointed snout extends from the triangular head and two pairs of barbels hang from the lower jaw. The upper side of the body varies from dark yellow through brown to dark grey, and this fades to milky white on the underside (4). Juveniles have a black body and tail with a light grey line running from head to tail (5).

Also known as
Dabry’s sturgeon.
Size
Length: 130 – 250 cm (2)
Weight
16 kg (2)
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Yangtze sturgeon biology

This nocturnal fish undertakes regular migrations, and after becoming sexually mature at seven to eight years old, it swims upstream during the spring floods each year to spawn. A large number of sticky eggs are produced, which adhere securely to stones on the riverbed (4). From hatching to around three weeks old, the tiny juveniles remain close to the river bottom, feeding on zooplankton and hiding from predators. Once they reach 10 to 11 weeks old, they are large enough to migrate downstream to join the adults (5). Older Yangtze sturgeon consume small fish and aquatic plants (4).

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Yangtze sturgeon range

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Yangtze sturgeon habitat

The Yangtze sturgeon is found in a variety of freshwater habitats, away from the riverbank in water eight to ten metres deep. Adults appear to prefer regions with a sandy silt bottom, and young stay in sandy shallows (4).

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Yangtze sturgeon status

The Yangtze sturgeon is classified as Critically Endangered (CR) on the IUCN Red List 2007 (1), and is listed on Appendix II of CITES (3).

IUCN Red List species status – Critically Endangered

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Yangtze sturgeon threats

The Yangtze sturgeon is at risk from over-fishing, pollution, and habitat degradation and loss. An important factor in its decline was the construction of the Gezhouba Dam across the Yangtze River at Yichang in Hubei Province in 1981. As this prevented upstream migration necessary for spawning, the Yangtze sturgeon is now only found above the dam (2).

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Yangtze sturgeon conservation

Conservation of this fish is now urgent, with emphasis needed on habitat protection, capture control and stock replenishment. This sturgeon species spawns earlier in life than most sturgeons, and therefore has aquaculture potential for caviar production. Controlled production of the Yangtze sturgeon could both reduce fishing levels and allow reintroductions of fish back into the river (2).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: arkive@wildscreen.org.uk
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Glossary

Barbels
Fleshy projections near the mouth of some fish.
Endemic
A species or taxonomic group that is only found in one particular country or geographic area.
Plankton
Aquatic organisms that drift with water movements; may be either phytoplankton (plants), or zooplankton (animals).
Reintroduction
Putting an animal or plant into an area where the species or sub-species previously lived but from which they are locally extinct - usually referring to projects aiming to re-establish self-perpetuating populations.
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References

  1. IUCN Red List (March, 2005)
    http://www.iucnredlist.org
  2. Zuang, P., Ke, F.E., Wei, Q.W., He, X.F. and Cen, Y.J. (1997) Biology and life history of Dabry’s sturgeon, Acipenser dabryanus, in the Yangtze River. Environmental Biology of Fishes, 48(1): 257 - 264.
  3. CITES (March, 2005)
    http://www.cites.org
  4. Fisheries Global Information System (March, 2005)
    http://www.fao.org/figis/servlet/species?fid=10178
  5. Kynard, B., Zhuang, P., Zhang, T. and Zhang, L.Z. (2003) Ontogenetic behaviour and migration of Dabry’s sturgeon, Acipenser dabryanus, from the Yangtze River, with notes on body colour and development rate. Environmental Biology of Fishes, 66(1): 27 - 36.
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Image credit

Yangtze sturgeon in conservation project  
Yangtze sturgeon in conservation project

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Tel: +44 (0) 20 7266 4646
Fax: +44 (0) 20 7289 2599
cicada@cicadafilms.com
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