Salinity and osmotic shock

[Eric1493]

After reading threads abt adjusting salinity, I haven’t found a definitive answer of how much you can drop salinity in one go (For fish only). Is 0.002 ok? Or even 0.005? Completely hypothetical questions, just wondering.

 

[dwest]

I think this is tough to answer. For example, you can give a freshwater dip where you go from full salinity, then fresh for five minutes, then back to full salinity. I’ve never had a fish experience long term problems from that. But I believe many struggle when getting fish online at 1.015 specific gravity and trying to put them immediately into full salinity aquarium water. When I quarantine a new fish, I would certainly acclimate them to full strength seawater over the course of a couple weeks.

 

[ichthyogeek]

To answer your question, I believe that drops of .002 and .005 salinity are within the safe range for fish.

If I remember correctly, you can safely drop the salinity much faster than you can safely raise the salinity. More salt in the water = less dissolved gas. And since non-anadromous saltwater fish are adapted to losing water from their bodies (as opposed to water entering their bodies like with freshwater fish), dropping the salinity can help with the stress.

 

[LaloJ]

Omg I post in a wrong theme, sorry.