It is true that some fish can spend the winter frozen in ice and come out swimming once the ice melts. Not all fish get caught in the ice, of course. Ponds and lakes freeze from the top down, meaning that beneath the icy surface there is usually a layer of liquid water where fish swim.
But what about fish that are caught in the ice? It stands to reason that the extreme cold would damage the fish’s tissue, effectively killing it. Like all cells, fish cells contain saline or salt water. Since salt water has a lower freezing point than pure water, even when encased in ice at thirty-two degrees Fahrenheit, cold-water fish are not technically frozen. Moreover, some fish contain a kind of antifreeze substance that allows them to survive very cold conditions.
Much like bears and other hibernating animals, some ice-bound fish are able to shut down basic bodily functions, slow their metabolism, and enter a dormant state. Cold but not frozen, these fish bide their time until spring when the ice disappears.
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