under brackish water one understands river or sea waters with a Salzgehalt from 0,1% to 1% (1 ‰ to 10 ‰). In the anglo-saxon area a Salzgehalt (Salinität) between 0,05% and 1,8% becomes, partly also 3% set. Water with smaller Salzgehalt is called fresh water, water with higher Salzgehalt seawater. The word brackish water is derived from the flat-German word Brack , which designates a lake resulted from Deichbruch.
by the brackish water developsin Flussmündungen and seas ecologically the brackish water zone in such a way specified. Here - depending upon Salzgehalt - fresh water-tolerant kinds from the sea and seawater-tolerant kinds from the fresh water meet. A set of animal and plant types so the ability developed,to survive in the brackish water, for example
- fish: Flounder, Hecht, Zander, Stint
- of cancers: Chinese Wollhandkrabbe, mud cancer Corophium volutator, Seepocke Balanus improvisus, shrimp Palaemon longirostris, sea woodlouse Jaera albifrons
- soft animals: Mussel Mytilus edulis
- Polychaeten: Meeresringelwurm Nereis diversicolor
- Oligochaeten: Nais elinguis
- bloom plants: Occurrence
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- in the East part of the Baltic Sea, in particular the Finnish sea bosom and the Bottni sea bosom.
- particularly pronouncedly within the muzzle ranges of the Tideflüsse like Elbe, Weser, Ems, disturb, Eider, Rhine, Severn, its, Themse. Here the brackish water zone can cover more than 50 km length.
- also within the lowest muzzle ranges of low land rivers as or and Weichsel, which flow into hardly by the Tide affected the Baltic Sea or in the Mediterranean
- into tropical Mangroven - sumps
also in the inland it can come by leaching from salt deposit places to the formation of brackish water. This can both naturally take place and via thatHumans (mining industry waste water of salt mines). In this way became the Werra and Weser in the second half 20. Century in the upper and central run to brackish water rivers.