Overview

Comprehensive Description

Biology

Adults inhabit springs. Mature individuals spawn in February - October (Ref. 59043). Males build, guard and aerate the nest where the eggs are deposited (Ref. 205).
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Distribution

Range Description

Romania: freshwater springs of hypersaline littoral Lake Techirghiol (south of Constanta).
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Europe: freshwater springs of hypersaline littoral Lake Techirghiol (south of Constanta) in Romania.
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Physical Description

Size

Max. size

6.5 cm SL (male/unsexed; (Ref. 59043))
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Diagnostic Description

Distinguished from congeners in Europe by possessing two unique characters: 13-17 scutes on trunk, no scutes above anal base; and posterior edge of scutes smooth. Differs further by having scutes forming a lateral keel on caudal peduncle (Ref. 59043).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Habitat:
Freshwater springs.

Biology:
Spawns during an extended period, in February-October.

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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Life History and Behavior

Life Cycle

Males build, guard and aerate the nest where the eggs are deposited (Ref. 205).
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
EX
Extinct

Red List Criteria

Version
3.1

Year Assessed
2008

Assessor/s
Freyhof, J. & Kottelat, M.

Reviewer/s
Bogutskaya, N., & Smith, K. (IUCN Freshwater Biodiversity Unit)

Contributor/s

Justification
The species was last recorded in the 1960's. The extinction is a result of hybridisation with G. aculeatus. The springs inhabited by G. crenobiontus used to be separated from the habitat of G. aculeatus by a hypersaline lake that served as a barrier between the species. Irrigation works transformed the lake into a brackish one, which was invaded by migratory G. aculeatus. Survey work since the 1960's, most recently in 1998, have failed to find the species.
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Population

Population
Last recorded in the 1960's. Further surveys, most recently in 1998, all failed to find the species.
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Threats

Major Threats
Hybridisation with G. aculeatus which invaded its habitat when irrigation transformed the hypersaline lake which served as a natural barrier between the two species.
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Extinct (EX)
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Management

Conservation Actions

Conservation Actions
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Wikipedia

Techirghiol stickleback

The Techirghiol stickleback (Gasterosteus crenobiontus) was an endemic fish species, found in the streams inflowing to the coastal hyperhaline Lake Techirghiol in southern Romania. It was a freshwater benthopelagic fish, up to 6.5 centimetres (2.6 in) SL in length. It is considered as extinct due to hybridization with the Three-spined stickleback.

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