Do you know how the fish lives in a frozen pond? We know that ice is lighter than water, and therefore it floats. So what we call a frozen pond is a pond the surface of which is frozen. Skaters understand it quite well. They always want to know how thick the ice on the pond is, because they know that there is water under it.
When we speak about fish living in a frozen pond, we mean fish living in water which has a layer of frozen water above it.
The most serious problem for the fish is not the coldness of the water in which it lives, but how that water can get enough air for the fish. When a pond is not frozen, oxygen from the air is passing into the surface of the water as soon as it is used by the fish in the pond.
When a pond is frozen, this process is almost stopped. Of course the water can get a little oxygen at the edge of the ice, or through air-holes.
But the best hope for the fish is new water which comes into the pond below the ice from different springs or streams and which brings enough oxygen for the fish in the pond.
And you may be sure that if the water in the pond does not get enough oxygen for the fish, the fish dies.
... that the shark never sleeps?
... that the trout sees only above its eye level?
... that the sword-fish which feeds on other fish has no teeth?
... that fish tastes with its skin?
