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I don't have any scientific papers to back it up. When I worked for an online seller that was what I was told. All the wholesalers I have ever been to believe it is true. Some of them use natural seawater, so it costs them more to reduce the salinity.
Also Fresh water kills many parasites, as does hyposalinity, making it easy to believe it would make it harder for the to survive in lower salinity.
My personal experience backs this up.
so someone told them, then they told you, so you believe it, now you are telling someone else...as I said it may be true it may not be, no evidence to back this up, fish can live in many different salinity, just because they can live in a lower one doesn’t mean it is better for them.
I don’t see how your parasite argument supports what you are saying, parasites die in lower salinity how is that supporting your claim?
We could go back and forth with this argument forever, all I’m saying is there is no science I’ve seen to back this up, we got here because I said a lot of LFS use lower salinity to save money, I’m sure some believe this may also help the fish but IMO the main reason is to make a saving, no proof on that just my feeling, same as your reason for believing lower salinity helps fish.