Salmo ezenami 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Salmoniformes Salmonidae

Scientific Name: Salmo ezenami Berg, 1948
Common Name(s):
English Kezenoi-am Trout

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii,v)+2ab(iii,v) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Freyhof, J. & Kottelat, M.
Reviewer(s): Bogutskaya, N., & Smith, K. (IUCN Freshwater Biodiversity Unit)
The species is known only from Lake Kezenoi-am (2.4 km²) in the northern Caucasus where it is being impacted by the introduction of Squalius cephalus, which feeds on its fry. Prior to the introduction of Gobio holurus and Squalius cephalus, S. ezenami was the only fish in the lake. Levels of harvesting are unknown as the area is a war zone (Chechnya).

Geographic Range [top]

Range Description:Russia: Lake Kezenoi-am (formerly Eizenam (Daghestan)) in northern Caucasus at 1870 m above sea level. In 1963, introduced in Lake Mochokh (Daghestan), probably established.
Countries occurrence:
Russian Federation
Additional data:
Lower elevation limit (metres):1870
Upper elevation limit (metres):1870
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:No information.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Habitat:
Lake Kezenoi-am is a mountain lake, 2.4 km²,with a maximum depth of 74 m,, temperatures about 5°C below 20 m and 5-18°C in upper layers in summer, covered by ice in winter, high oxygen concentrations down to bottom year-round and low plankton density. Spawns in lake, close to underwater springs; large-sized form probably migrates to tributaries. Prior to the introduction of Gobio holurus and Squalius cephalus, S. ezenami was the only fish in the lake.

Lacustrine, migrates to tributaries. Two forms are known: small-size (adults 160-260 mm SL, 200-350 g) and large-size (adults 380-1130 mm SL, over 1 kg). Males reproduce for the first time at two years, females at three. Spawning period extends over almost entire year. Young juveniles feed mostly on gammarids, chironomid larvae; larger juveniles and adults feed on molluscs, benthic invertebrates and fry; largest individuals are mostly piscivorous, especially since the introduction of G. holurus.
Movement patterns:Full Migrant

Threats [top]

Major Threat(s): Introduction of alien species (Squalius cephalus), which feeds on its fry. The region is hard to access as it is a war zone (Chechnya) so levels of harvesting are unknown.

Conservation Actions [top]

Conservation Actions: No information.

Citation: Freyhof, J. & Kottelat, M. 2008. Salmo ezenami. The IUCN Red List of Threatened Species 2008: e.T135643A4169176. . Downloaded on 24 October 2017.
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