Yeah, I mean HYPERSALINITY "higher salinty"

You farty phoo phoo's may poo poo it...but I am going to try.

I prefer to think of it as " Brad is pointing out the obvious" again. But hey, I think the question has been sort of answered, so feel free to make it about something else. Like I said, hypo is a great topic, clearly not fully understood as far as issues implementing, so with Leah's approval, discuss all you like :)

not my topic, and I should probably be working anyway. Boss just showed up -lol

Crap I was sure she meant hypo. I hate when Brad is right :redface:

"A salinity of 45ppt was selected because it would likely provide adequate control of the ciliates while minimizing fish stress" (Huff & Burns, 1981). Unfortunately, this method is considered to be more detrimental to the host than the parasite (Colorni, 1985).

Once took a semester long course on ichthyology, a long long time ago in a galaxy far far away.

Fish living in freshwater have a challenge where their blood have a higher concentration of solutes than water in its external environment. Bodily processes of freshwater fish are thus always countering osmosis since water has a natural osmotic tendency to enter their bodies while salts have a natural tendency to exit their bodies. In general, freshwater fish physiologically osmoregulate by retaining as much salts as possible at exchange sites (gills, gastrointestinal tract, urine, skin) and expelling water. Freshwater fish are basically always peeing water to maintain homeostasis. This is why adding a bit of salt for FRESHWATER fish eases their energy expenditure and helps when they are under stress.

In contrast, saltwater fish have a lower concentration of solutes in their blood than natural seawater. Water thus has a natural osmotic tendency to leave the fishes' bodies while salts have a natural osmotic tendency to enter their bodies. Saltwater fish are basically always drinking water and peeing fluids with high solutes concentrations, and expelling salts through their gills. This is why lowering salinity for SALTWATER fish helps when they are stressed, as it eases their energy expenditure in maintaining homeostasis. This does not apply to Elasmobranchs (sharks, rays, ratfishes)... their blood have higher solutes concentrations than seawater.

So if you go HYPERsalinity, it's going to energetically tax the fish more so than their natural environment.

from wikipedia on "Osmoregulation"

Freshwater fish: always peeing diluted urine. Adding salt would help by reducing osmotic differential.

http://upload.wikimedia.org/wikipedi...oin_bw_en2.png

Saltwater fish: always drinking water and peeing out concentrated urine. Reducing salinity would help by reducing the osmotic differential.

http://upload.wikimedia.org/wikipedi...aei_bw_en2.png

lol




you could also qt fish on the moon its not ideal but i think it would work.



hypersalinity sounds like a good name for a salt brand no??

super hyper hypo salinity salt mix...........adds kick to to your fish!!


:mrgreen::mrgreen::mrgreen:

are they sure the direction of food is that way??



does anyone else find salty concentrated urine offending??:mrgreen:

and how come the second fish does not eat food im confused :crazy:

I think they take turns