Brack may refer to Brackish water or a variety of tea cake, especially Barmbrack.
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The Colares stingray, Dasyatis colarensis, is a species of stingray in the family Dasyatidae, native to the shallow brackish waters of the Amazon River estuary in northern Brazil.
Proterorhinus nasalis, the Eastern tubenose goby, is a species of goby native to fresh and brackish waters of the basins of the Sea of Azov and the Caspian Sea and has invaded the upper reaches of the Volga River from its native occurrence in the delta.
The delta is ecologically important and includes a wide variety of habitats, including Mesic flood plains, cypress-gum swamps, tidal brackish water marshes, bottomland forests and submersed grassbeds.
Brackish water detailing the type of water of the Thames Estuary as opposed to the North Sea's Kent/Essex Strait which in terms of sea water salinity stops at Gravesend
About its late Whaingaroan (about 27 million years ago) creation, it says, “The change from estuarine, shallow brackish water conditions (Mangakotuku Formation), to fully marine, open sea, aerobic conditions (Glen Massey Formation) is evidenced by near shore accumulation of the bioclastic Elgood Limestone, onlap of the succeeding Dunphail Siltstone, and subsequent deposition of Ahirau Sandstone in an inner to mid shelf environment.”
Although Illinois was a free state, Crenshaw leased the salt works in nearby Equality, Illinois from the U.S. Government, which permitted the use of slaves for the arduous labor of hauling and boiling brackish water, from local salt springs, to produce salt.
A fragment of the shell of this brackish water species has been found near Alexandria, Louisiana.
Terebralia palustris, the mangrove whelk, a species of brackish-water snail in the family Potamididae.