Hey all, longtime lurker finally coming out of the shadows to ask this question. Last week I was in search of some nice clams to make linguine vongole at home. The neighborhood market - which has always had extremely fresh fare - had some that looked fine on first blush, but on closer inspection many of them were slightly open. So the guy behind the counter tells me something I haven't heard before: that the clams are still alive, if I just "refresh" them in some ice water they'll snap right shut again. I didn't want to risk it so I declined, but I wanted to see if this is crazy talk or what. Any experience with this? Maybe the temperature in the refrigerator case was a bit too high? I want to trust them since all their other stuff is great quality, but I know better than to be cavalier with my mollusks.
I think if this happens again I'll simply ask to see one of the open ones and investigate it, by smell and by seeing if it reacts in any way to a tap on the shell.