Well, don't let them sit indefinitely. Provided they were filled with pure O2, the stockers will be good for the time it takes for the bag water to come up (or down) to match the pond water temperature. Say 1/2 hour or so unless there was a huge difference in temp to begin with.


"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]