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1 _______.
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.
2 _______. Of course the water can get a little oxygen at the edge of the ice, or through air-boles.
3 _______. It brings enough oxygen for the fish in the pond.
4 _______.
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.
When a pond is frozen, this process is almost stopped.
But the best hope for the fish is new water which comes into the pond below the ice from different springs and streams.
And you may be sure that if the water in the pond does not get enough oxygen for the fish, the fish dies.
