European dace (Squalius keadicus)

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European dace fact file

European dace description

KingdomAnimalia
PhylumChordata
ClassActinopterygii
OrderCypriniformes
FamilyCyprinidae
GenusSqualius (1)

A rare freshwater species found only in the Evrotas River in Greece, the European dace is a member of the Cyprinidae family, a diverse group of fish comprising over 2,000 species (1) (3). Most of these fish have scaleless heads and lack teeth, instead possessing a pair of enlarged bones in the throat that grind food against a pad at the base of the skull (3). The European dace has a dark-brownish blue colouration with a dark stripe extending from the eye to the base of the tail (2) (4). Displaying marked sexual dimorphism, the smaller male has comparatively larger pectoral and pelvic fins than the female (2).

Also known as
Evrotas dace.
Synonyms
Leuciscus keadicus.
Size
Maximum length: 25 cm (2)
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European dace biology

A rare and little-studied species, there is, understandably, a lack of information on the biology of the European dace. However, this omnivore is thought to feed throughout the water column, and spawning is thought to take place in mid-spring, from the second-half of April through the beginning of May (2) (4) (5). Juvenile fish typically mature in the second year of life, although some males may mature in the first (2).

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European dace range

The European dace is endemic to the Evrotas River in south-eastern Peloponnese, Greece (1).

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European dace habitat

The European dace typically inhabits cold, deep, fast flowing areas of the Evrotas, preferring areas with submerged tree roots, aquatic vegetation and a coarse substrate. At early stages in its life and during periods when parts of the Evrotas seasonally dry up, the European dace will also occupy less favourable habitats, including shallower pools with little water flow and a lower oxygen concentration (1) (5).    

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European dace status

Classified as Endangered (EN) on the IUCN Red List (1).

IUCN Red List species status – Endangered

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European dace threats

Restricted to just a single river, the European dace is primarily threatened by the loss of its habitat. Although the Evrotas River naturally dries up during periods of drought, water extraction for agriculture has exacerbated this, resulting in fish being stranded in stagnant pools of water with low oxygen concentration and high temperatures (1) (6). This was most severe in 2007 when a prolonged drought resulted in around 80 percent of the main river course drying up (6). As the European dace inhabits fast flowing, cold waters, mass fish mortality has been observed in areas where its habitat has been degraded in such a way (5). Fish communities within the Evrotas River have also suffered from pollution, with lowland parts of the river, often near urban areas, being the most severely effected (1) (6).

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European dace conservation

The Evrotas River, home to the European dace, is a unique biodiversity hotspot within Greece. Its waters support many endemic species of plants and fish and, consequently, protecting this fragile environment is a key conservation priority (6). The importance of this river and a plan for its conservation, is outlined in the EU Water Framework Directive. This requires habitat monitoring and management programmes to be implemented whilst tackling the threats to the river (6) (7). Furthermore, establishing protected areas and developing sustainable water management plans will be crucial in preserving the European dace for the future (1) (2).

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Find out more

For additional information on the European dace, see:

  • Economou, A.N., Barbieri, R. and Stoumboudi, M.T. (2005) Threatened Fishes of the World: Leuciscus keadicus (Stephanidis 1971) (Cyprinidae). Environmental Biology of Fishes, 73: 252.
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Authentication

Authenticated (20/05/2010) by Leonidas Vardakas, Hellenic Centre of Marine Research, Institute of Inland Waters, Greece.
http://www.hcmr.gr/

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Glossary

Endemic
A species or taxonomic group that is only found in one particular country or geographic area.
Omnivore
An organism that feeds on both plants and animals.
Pectoral fins
In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
Pelvic fins
In fish, the pair of fins found on the underside of the body.
Sexual dimorphism
When males and females of the same species differ in appearance.
Spawning
The production or depositing of large quantities of eggs in water.
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References

  1. IUCN Red List (May, 2010)
    http://www.iucnredlist.org/
  2. Economou, A.N., Barbieri, R. and Stoumboudi, M.T. (2005) Threatened Fishes of the World: Leuciscus keadicus (Stephanidis 1971) (Cyprinidae). Environmental Biology of Fishes, 73: 252.
  3. Campbell, A. and Dawes, J. (2004) Encyclopedia of Underwater Life. Oxford University Press, Oxford.
  4. FishBase (May, 2010)
    http://fishbase.org/Country/CountrySpeciesSummary.cfm?c_code=300&id=26270
  5. Vardakas, L. (2010) Pers. comm.
  6. Vardakas, L., Skoulikidis, N., Karaouzas, I., Gritzalis, K., Tachos, V., Zogaris, S., Kommatas, D. and Economou, A.N. (2010) Assessing the ecological status of the ‘artificially intermittent’ Evrotas River (Greece) according to the Water Framework Directive 2000/60/EC. Balwois, 2010: 1-10.
  7. EU Water Framework Directive (May, 2010)
    http://ec.europa.eu/environment/water/water-framework/index_en.html
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Image credit

Squalius keadicus head detail  
Squalius keadicus head detail

© Leonidas Vardakas

Leonidas Vardakas
louisvard@gmail.com

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