Fish and Freezerburn

I was sitting in my basement, looking at a fish mounted on the wall, and thinking about how cold it is outside. Then, I started wondering- how can fish survive the cold weather? So, I began looking up how they go about doing this on google and I found some interesting answers. In tempature regions like where I live, where it is warm during the middle of spring to halfway through autumn, the fish simply go into a hibernation-like state when the lakes freeze over with ice. Fish who live in the areas where the tempature is constantly four degrees celcius or below, though, have a much more interesting way of dealing with the cold. Many of these cool fish have an antifreeze in their bodies or an antifreeze they can make when needed. Some artic fish take this to a whole new level, having antifreeze instead of hemoglobin. How is this possible? The fish live in salt water, where the water can be mch below 0 degrees Celcius and still not freeze. One property of water is the colder it gets, the more oxygen it can contain. Since the frigid waters of the artic are so oxygen rich, the fish don't need any oxygen carrying substances to assist them in getting enough oxygen to survive.