Normally if you cool a liquid it becomes dense. Same thing happens to water till 4 degrees Celsius. Further cooling below 4 degree Celsius causes water to expand. Water freezes to form ice at 0 degree Celsius, and expands further. Due to low density of ice compared to the density of water, the ice floats on water.
Due to this nature of water, i.e. it is densest at 4 degrees, the 4 degree water goes to the bottom of lakes. Only the surface gets too cold and freezes. Ice is also a bad conductor of heat, this slows down the freezing of lower layers. This way marine life in water, can remain in water, although the surface freezes to form ice...
Source: answers.com
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