Brackish water is water that is saltier than fresh water, but not as salty as sea water. It may result from mixing of seawater with fresh water, as in estuaries, or it may occur naturally, as in brackish fossil aquifers. Technically, brackish water contains between 0.5 and 30 grams of salt per litre—more often expressed as 0.5 to 30 parts per thousand (ppt or ‰). Thus, brackish covers a range of salinity regimes and is not considered a precisely defined condition. It is characteristic of many brackish surface waters that their salinity can vary considerably over space and/or time.
1 External links
2 Brackish bodies of water
3 See also
The term brackish water derives from the Low Saxon word brackwater, which is the water of a brack. A brack is a small lake created when a storm tide breaks a dike and floods land behind the dike.
Brackish water aquaria
Keeping brackish water aquaria is a popular specialization within the fishkeeping hobby. Many species of fish traded as freshwater species actually do better in brackish water, for example black mollies, Florida flagfish, and some cichlids such as orange chromides. There are also several popular species traded purely as brackish water fish, including Monodactylus spp, scats, archerfish, and various species of pufferfish, goby, and flatfish. Generally aquarists need to maintain a specific gravity of around 1.005 to 1.010 depending on the species being kept, but practically all brackish water fish tolerate variations in salinity well, and some aquarists maintain that regularly fluctuating the salinity in the aquarium actually keeps the fish healthy and free of parasites.
Brackish bodies of water
Lake Pontchartrain, north of New Orleans, Louisiana
Hampton Roads, Virginia
Pulicat Lake, north of Chennai, India
Kaliveli Lake, near Pondichery, India
Chilka Lake, in Orissa state, India
- The Rann of Kutch, on the border of India and Pakistan
- Lingding Yang , Guangdong, China
River Thames at London
- Pangong Tso in Ladakh, Jammu and Kashmir state, India
Last updated: 08-29-2005 14:35:45