I was fascinated by this video, because I’ve heard that certain cold blooded animals could live after being frozen, but I’ve never seen it happen. I decided to look up what happens to the fish when they are in frozen form. There is a surprisingly small amount of information available on the topic.
Frozen Fish Reanimated
There’s somewhat of a debate on whether a fish can live after being frozen. Some would say that it’s impossible; if an ordinary fish is frozen solid it will die. Their body fluids and cells will freeze, causing irreparable damage to the fish, resulting in death. Well then you might ask, “What about this video, doesn’t it prove that theory to be wrong?”
First off, we’re not sure exactly how this fish was frozen, or for how long. Some experiments have been done, involving “flash freezing.” This is where a fish is frozen quickly, using liquid nitrogen. They are generally thawed out fairly quick after this process is completed, resulting in reanimation. It’s unknown whether there are life-altering complications in the fish afterwards. Or, for how long they can remain in this “frozen” state.
There are certain types of fish, who can survive freezing temperatures, such as polar fish. These fish, who reside in the polar regions, are large fish whose bodies produce a protein that prevents them from freezing.
Teleost fish, are fish whose skeletons are made of bone instead of cartilage. The blood of teleost fish is less concentrated than the water they swim in. It has been adapted to living in cold water.
When fish live in ponds, the water freezes in the winter, but it never freezes all the way to the bottom. There will always be water under the ice for the fish to swim in. These fish might shut down their basic body functions and go into a dormant state, that slightly resembles hibernation.
As for reanimating frozen fish; if you were thinking about throwing a live fish in your freezer for a few days, with the expectation that it will come back to life when it’s thawed; then you might want to rethink it. You’ll most likely end up with a dead, stinky fish.