Chondrostoma soetta 

Scope: Global & Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Cyprinidae

Scientific Name: Chondrostoma soetta Bonaparte, 1840
Common Name(s):
English Italian Nase

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(i,ii,iii,iv,v) ver 3.1
Year Published: 2006
Date Assessed: 2006-01-31
Needs updating
Assessor(s): Crivelli, A.J.
Reviewer(s): Bianco, G. & Darwall, W. (Mediterranean Workshop, Dec. 2004)
The lake populations have increasing difficulty in reaching the spawning places in the tributaries. Although the introduced subpopulations are thriving, the threat to the remaining severely fragmented natural population and spawning areas is high due to dam construction, pollution, water extraction and predation by cormorants and Silurus glanis. The area of occupancy (AOO) (based on the spawning grounds) is estimated at less than 500 km². It is locally extinct in Slovenia and the Isonzo river basin in Italy due to the introduction of Chondrostoma nasus, a practice still implemented.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Restricted to northern Italy, the southern part of Switzerland. It has been introduced in some Italian lakes. It is locally extinct in Slovenia and the Isonzo river basin in Italy due to the introduction of Chondrostoma nasus, a practice still implemented.Recorded introductions into the rivers of central Italy were often a misidentification for C. genei. Several present records for C. soetta are probably a misidentification for C. nasus, due to similarities between these two species. As an example of how the alien species are spread now in Italy, in rivers from the Rovigo Province in eastern Italy, where C. soetta is still reported, the biomass of all native species was found to be about 22% of whole ichthyofauna.
Countries occurrence:
Italy; Switzerland
Regionally extinct:
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Very different from one locality to another. It is locally extinct in Slovenia but still thriving in other parts of its range. This species is now becoming quite rare in the lakes of northern Italy and Switzerland (Lugano, Maggiore, Como, Iseo, Garda) mainly as result of interaction with alien species, especially Rutilus rutilus, which was introduced around 1990 and has become very common and is the subject of commercial fishing in several of these lakes. (Bianco, P. pers. comm). This species is also rarely found in rivers and has nearly disappeared in the main stretch of the Po basin, in the other rivers it forms very small populations and spawning occurs only in a few areas of each river (except in the Po).
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:A deepwater lacustrine species that also inhabits large rivers. It migrates from the lake to its tributaries for spawning in spring.

Threats [top]

Major Threat(s): Dams, water pollution and extraction, and introduction of alien species as Rutilus rutilus, Silurus glanis and Chondrostoma nasus. The reduction in suitable spawning places due to pollution (agriculture) and to water extraction is of major concern.Other threats to the species are predation by cormorants, where in several places of Italy have become a serious pest and destroyed a large amount of fishes, especially in torrents or small river were the fishes migrate to for reproduction. (Compiled by C.esare Puzzi from GRAIA, and P.G. Bianco pers comm.).

Conservation Actions [top]

Conservation Actions: Listed in Annex II of the European Union Habitats Directive and in the Appendix III of the Bern Convention.

Citation: Crivelli, A.J. 2006. Chondrostoma soetta. The IUCN Red List of Threatened Species 2006: e.T4794A11095769. . Downloaded on 19 August 2018.
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