| I say give it the freshwater dip to be safe... it really isn't that stressful at all. I dip large clams for 15 minutes, and baby clams for 7-10 minutes.
If it is the dreaded pinched mantle 'disease', then you'll have to dip 'all' the clams, and not just the affected one, since others can be carriers yet not show symptoms.
I've already lost two clams to pinched mantle (last year), so it's no fun.
Just FYI, my clams reopen fully about a half-hour after the freshwater dip, so it appears to not be that detrimental to their health.
If the mantle is pinched just on one small spot, it could be due to injury, like from a roaming hermit or snail shell damaging the mantle.
HTH.
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