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How do fish survive in a frozen body of water?

Obviously I don't mean a COMPLETELY frozen body of water, just the top.

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Water has the property of anomalous exp i.e, it's density is max at 4 degrees and decreases below 4 degrees.Therefore when temp lowers and reaches 4 degrees the upper layer of water becomes max in density and goes down . The exposed layer is lighter ( as it has to face a temp below 4 degrees ). This process goes on and the surface freezes at 0 degrees but aquatic life remains alive at the bottom at 4 degrees

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Most bodies of water with fish in them have an aerator in them to keep one section of ice open and allow oxygen in the water in the winter. If the ice completely freezes over the fish will suffocate and die.

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Well water in lakes and oceans almost NEVER freezes completely (of course there's some exceptions but this is the case 99.99% of the time!). One reason is due to waters ability to retain heat and not freeze due to that. We also know water has a relative density of 1. However water is MORE dense at 4degrees Celsius thus, water doesnt freeze at the bottom (0degrees C is freezinbg point)

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Well, salt keeps the water freezing. But, I'm talking lakes, ponds etc. Helpful comment though!
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Salt helps but the things I said are much more important. I teach college biology and thats a major component in ecology.
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Thank you for your contribution to this question.
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"In winter, the coldest water in the lake (Odegrees C) lies just below the surface of ice; water is progressively warmer at deeper levels of the lake, typically 4 degrees C at the bottom"

Reece. "52: Ecology and the Biosphere." Biology. By Cambell. Eigth ed. N.p.: n.p., n.d. N. pag. Print. AP* Edition.
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no problem. I looked up the page in case you want to check it out from the library and I cited it (sorry, i manually cited)
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Thank you. You've solved my inquiry.
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but goldfish and feeder fish better known as carp can come back to life after being totally frozen. that's why people stock small ponds with these kinds of fish because they can come back after being totally frozen.

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Water freezes from the top down, Leaving liquid water below it.

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