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The deeper the water gets the less light is available for photosynthesis, and you can imagine that with less photosynthesis taking place there is progressively less dissolved oxygen. Since nutrients are heavy (think decomposing animals) they tend to sink to the ocean floor where it is very nutrient rich. The closer to the surface the more nutrient poor you tend to be unless you are near a shore where tides may push nutrients up in what is called an upwelling. Upwellings are ussually seasonal and mix the distinct levels of the body of water.

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