Cobitis bilseli


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Cobitis bilseli
Species Authority: Battalgil, 1942
Common Name/s:
English Great Beyşehir spined loach

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(v)+2ab(v); C2a(i,ii) ver 3.1
Year Published: 2006
Date Assessed: 2006-01-31
Assessor/s: Crivelli, A.J.
Reviewer/s: Karatash, A., Erk’akan, F. & Bogutskaya, N. (Mediterranean Workshop, Dec. 2004)
The species is restricted to one small stream (<10 km²) leading to Lake Beysehir. It cannot go into the lake itself because of a waterfall just before it reaches the lake. The lake itself, and other tributaries to the lake, have introduced species there (Sander lucioperca), therefore introduction of the species into other tributaries or to the lake is not an option. The fish is harvested locally for food. The most recent survey (1998) estimates there to be fewer than 50 mature individuals (F. Erk'akan, pers. comm.). Currently assessed as Critically Endangered based on low population size, restricted range and suspected population declines (CR B1ab(v)+2ab(v); C2a(i,ii)). If further survey work confirms population size to be larger than currently believed, or population to be stable the species may move down to Vulnerable based on its highly restricted range (VU D2).

Geographic Range [top]

Range Description: This species is restricted to one stream leading to Lake Beysehir in Central Anatolia, Turkey. The fish doesn't occur the lake itself anymore because the route is blocked by a waterfall. The stream is small: extent of occurrence and area of occupancy are both less than 10 km²
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population is very small. In 1997 and 1998, Erk'akan visited the stream and the population was small. There were estimated to be fewer than 50 mature fish in 1998 (F. Erk'akan, pers. comm.). Further surveys are needed to confirm current population size.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Occurs in one stream. An unusually large Cobitis species. Prefers mud and sand substrate.
Systems: Freshwater

Threats [top]

Major Threat(s): In Beysehir Lake, the water is not polluted. There are introduced Zander in the lake and associated tributaries, but these do not enter the stream occupied by C. bilseli. The species is fished locally and this may be causing declines.

Conservation Actions [top]

Conservation Actions: Further survey work is required to confirm current population size. Lake Beysehir area is a national park.
Citation: Crivelli, A.J. 2006. Cobitis bilseli. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <>. Downloaded on 21 April 2014.
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