Atlantic sturgeon (Acipenser sturio)

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Atlantic sturgeon egg and larvae
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Atlantic sturgeon fact file

Atlantic sturgeon description

KingdomAnimalia
PhylumChordata
ClassActinopterygii
OrderAcipenseriformes
FamilyAcipenseridae
GenusAcipenser (1)

One of the largest European fish to breed in rivers, the Atlantic sturgeon has been fished to the brink of extinction principally as a source of caviar (2). This sturgeon has an olive-black upper body and a white belly (4). The elongated body tapers to a narrow pointed tip at the snout and lacks scales, apart from the five rows of whitish bony platelets, or scutes, which run the length of the fish (4). Atlantic sturgeon have sensitive barbels which are positioned on the lower jaw and are used to locate prey, which is then sucked into the mouth (4).

Also known as
Baltic sturgeon, common sturgeon.
French
Esturgeon Commun.
Spanish
Esturión Común.
Size
Max length: 3.5 m (2)
Weight
up to 315 kg (2)
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Atlantic sturgeon biology

Sturgeons are generally solitary, spending a number of years at sea before returning to the river where they were born, in order to breed in their turn. Entering the river in spring, mature individuals migrate upriver to the shallow spawning grounds (4). Females can produce between 200,000 and 6 million eggs, which are sticky so that they can attach to the gravel substrate (4). Mature individuals do not eat throughout the spawning migration (4). As the juveniles grow they begin to migrate downstream, and adult fish spend about seven to eight years at sea before reaching sexual maturity (7).

Sturgeon feed opportunistically on bottom dwelling creatures, feeling for prey amongst the mud with the sensitive barbels on their chin. Their food consists mainly of invertebrates and small fish (4).

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Atlantic sturgeon range

Previously abundant along all European coasts, the Atlantic sturgeon is today restricted to a single, reproductive population that breeds in the Gironde River, France (5).

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Atlantic sturgeon habitat

Sturgeons are found near to the bottom of the water column, over a soft sandy or muddy substrate (6). Adults are found in the lower sections of large rivers and in the open sea, whilst spawning occurs upriver in shallow pools with a gravel base (6).

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Atlantic sturgeon status

Classified as Critically Endangered (CR) on the IUCN Red List 2007 (1), and listed on Appendix I of CITES (3).

IUCN Red List species status – Critically Endangered

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Atlantic sturgeon threats

These long-lived and slow-growing fish are very vulnerable to exploitation; the Atlantic sturgeon has been extensively fished for its highly prized flesh and for the eggs, which are sold as caviar (6). The development of river systems, in particular the construction of hydroelectric dams, destroys the breeding habitat of this species and adults are no longer able to return to their natal rivers to breed (8). Today only a single reproductive population remains and the species is consequently extremely vulnerable to extinction (5).

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Atlantic sturgeon conservation

The Atlantic sturgeon is protected from international trade by its listing on Appendix I of the Convention on International Trade in Endangered Species (CITES) (3). A captive breeding programme (8) for the species is being undertaken with the long-term goal of reintroducing this 'dinosaur of the sea' to some of its former range.

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

Authenticated (13/8/03) by John Waldman, Hudson River Foundation.
http://www.hudsonriver.org

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Glossary

Barbels
Fleshy projections near the mouth of some fish.
Invertebrates
Animals with no backbone.
Natal
Site of birth.
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References

  1. IUCN Red List (May, 2013)
    http://www.iucnredlist.org
  2. Burnie, D. (2001) Animal. Dorling Kindersley, London.
  3. CITES (August, 2002)
    http://www.cites.org
  4. Fishbase (August, 2002)
    http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Acipenser&speciesname=sturio
  5. Waldman, J. (2003) Pers. comm.
  6. WCMC Species Sheets (March, 2008)
    http://www.unep-wcmc.org/species/data/species_sheets/sturgeon.htm
  7. Eihao, J. (1991) Freshwater Fish. Aventinum Publishing, Prague.
  8. Helsinki Convention (HELCOM) (August, 2002)
    http://www.helcom.fi/environment2/biodiv/en_GB/fish/?u4.highlight=sturgeon
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Image credit

Atlantic sturgeon egg and larvae  
Atlantic sturgeon egg and larvae

© Philippe Garguil / Biosphoto

Biosphoto
16 rue Velouterie
Avignon
84000
France
Tel: +33 (490) 162 042
Fax: +33 (663) 208 434
http://www.biosphoto.com/

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