Hmm, interesting. There was a pond in front of the office at Denver which was created when construction diverted some of the Platte river, and it had 3 or 4 fish 'stuck' in it. In the winter the water froze solid and I walked over and saw one of the fish sitting there frozen in the ice. I was tempted to try to chip it out but it was too deep and the ice too hard. About 3 weeks later the ice melted and the fish was swimming around again. It was pretty amazing to see.