How do fish get oxygen in a frozen lake?
Different fish species do this either by absorbing oxygen into their skin, into the blood vessels in the walls of their swim bladders, stomach and gut, and some even inhale the air bubbles that form underneath the ice through their mouth.
What happens when fish get frozen in a lake?
One of the first things that happens to fish when a lake freezes is that their metabolism slows down. This means that they require less food and oxygen, and as a result, they may go into hibernation. They are generally less active and more sluggish, making them susceptible to predators.
How do fish not freeze in frozen lakes?
But if you’re a lake fish, you don’t have that option. Luckily, the properties of water make its solid form—ice—less dense than its liquid form. As a lake freezes, the ice floats on the surface, insulating the water below and keeping most lakes—and the fish within them—from freezing solid.