March 3, 2013
Maybe off topic, more about water than fish.
What is important about brackish water? Things I can think of are conductivity, osmotic tension, ion content and ratios.
My tap water is hard, 55 dGH, 12 dKH, about 1000 ppm tds. Mostly calcium sulfate, according to the published water quality report, some magnesium and sodium, too much chloride to meet US Federal regulations for discharge.
September 10, 2010
Usually brackish water refers to water resulting from the mixing of the local freshwater and seawater.
The salinity can vary due to the variability of the mixing.
The ions and their ratios will probably be dominated by those of seawater.
March 3, 2013
I should have been clear about why I was asking.
My tap water is hard, dGH55, dKH12
tds about 1000 ppm
conductivity about 2000 microseimens
These readings overlap some of the numbers I've seen posted min various places on the Internet. There is a small ammount of sodium and chloride ions in the water, most ofg the dissolved solids are calcium, carbonate, and sulfate ions.
I'm wondering about the effect of the water, is it the same as the effect that brackish water would have on the plants and fish.
July 30, 2008
Which specific effects are you referring to? There are some fish and plants that I wouldn expect to do particularly badly using that water (never heard of tap water to high in dissolved minerals before), there are other fish that should thrive in it as long as it doesn't contain other potentially toxic compounds (some killies and livebearers, some cichlids, various others). Some plants will probably do very well, I'd imagine Ceratophyllum will dbe just fine but you might need to experiment with others to see what does OK. If in doubt Java fern and Anubias are indestructible. Is it borehole water?
March 3, 2013
I had to think about this for a while. There are several questions.
In keeping livebearers it is common to be told to add salt. Nobody says if there is something specific about sodium chloride, or if the goal is just to raise TDS, which could be an effect on osmolality or conductivity.
Some fish are said to do better in brackish water. (scats, monos) Again, is there something special about sodium chloride.
Some snails (nerites) and some shrimp are said to breed only in brackish water. In the case of nerite snails I read that the water SG should be above 1.003. Mine is above that already.
April 28, 2011
It's true: when the freshwater identifies a very high total hardness, it may be sufficient for specific brackish water animals already, without that will still be add salt.
I have a hardness of 15 ° dH. With me living e.g. Omobranchus Zebra, Tetraodon biocellatus and Palaemontes variabilis without the addition of salt in the water. Here the shrimp are very sensitive. This molt in this water without any problems.
The determining factor in brackish water is the osmotic pressure and certain mineral deposits (important for invertebrates). But this can be achieved through very hard fresh water also.
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