Techirghiol stickleback
Encyclopedia
Techirghiol stickleback (Gasterosteus crenobiontus) is endemic fish species, found in the freshwater
Freshwater
Fresh water is naturally occurring water on the Earth's surface in ice sheets, ice caps, glaciers, bogs, ponds, lakes, rivers and streams, and underground as groundwater in aquifers and underground streams. Fresh water is generally characterized by having low concentrations of dissolved salts and...

 streams, inflow to the coastal hyperhaline Lake Techirghiol in southern Romania
Romania
Romania is a country located at the crossroads of Central and Southeastern Europe, on the Lower Danube, within and outside the Carpathian arch, bordering on the Black Sea...

. Freshwater
Freshwater
Fresh water is naturally occurring water on the Earth's surface in ice sheets, ice caps, glaciers, bogs, ponds, lakes, rivers and streams, and underground as groundwater in aquifers and underground streams. Fresh water is generally characterized by having low concentrations of dissolved salts and...

 benthopelagic fish, up to 6.5 cm length. It is considered as extincted because of hybridisation
Hybridisation
Hybridisation or hybridization may refer to:*The process of combining different varieties or species of organisms to create a hybrid *Nucleic acid hybridisation, the process of joining two complementary strands of DNA...

 with Three-spined stickleback
Three-spined stickleback
The three-spined stickleback, Gasterosteus aculeatus, is a fish native to much of northern Europe, northern Asia and North America. It has been introduced into parts of southern and central Europe.-Distribution and morphological variation:...

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