Posts Tagged ‘River Svärtaån’

River Svärtaån

Written by Ivan on . Posted in Project sites, River Svärtaån


The River Svärtaån flows 13 km, from Lake Runnviken in the north, to the Bay of Sjösa at the Baltic Sea. The catchment area covers 372 km2 and extends as it flows through the municipality of Gnesta in the north to Nyköping in the south. The River Svärtaån Natura 2000 area includes six km from the Bay of Sjösa at the Baltic Sea up to the small village of Svärta in the north. The river meanders mostly through open farmland.  However, parts of the course have been channelized and dredged. In the lower parts, the River Svärtaån runs through forested areas. However, the land adjacent to the river consists mainly of farmland. At high water levels, flooded parts of the river create important foraging and nesting sites for birds. The river also contains an interesting fauna of fish and mussel species. Among the mussels, Unio crassus and Pseudanodonta complanata have been found.

The site has a high conservation value. Is one of few areas in Södermanland County where the thick shelled river mussel (Unio crassus) has been found. The topography and the water level create important foraging and nesting sites for birds. The area shelters interesting fauna of fish and mussel species such as the perch (Perca fluviatil), the bleak ( Alburnus alburnus), The roach (Rutilus rutilus), the pike ( Esox Lucius), The ruff (Acerina cernua), the tench (Tinca tinca), the Bream (Abramis vimba), the Dace (Leuciscus leusciscus), The nine spine stickleback ( Pungitius pungitius), and the Stone loch (Barbatula barbatula).

The fish fauna in the River Svärtaån shows a large variety in species. The Perca fluviatilis (perch), Alburnus alburnus (bleak), Rutilius rutilius (roach), Esox lucius (pike), Acerina cernua (ruff), Tinca tinca (tench), Abramis vimba (bream), Leuciscus leuciscus (dace), Pungitius pungitius (nine spine stickleback) and Barbatula barbatula (stone loach) have all been found in the river.

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