[Barry N.]

At the clams farms they even take the clams out of the water to clean the shells prior to exporting. We also do the same thing.

I would't leave them out of water for very long as it will cause stress and that could trigger a spawn.

When you take them out of the bag and place them in the tank, once in the water tap the side of the shell gently so any air that may be trapped will be released

Good luck.