Do fish prefer certain colored food?

When it comes to live and frozen foods, some are better than others for enhancing the coloration of aquarium fish. Crustaceans like brine shrimp are a great way to enhance coloration, as are frozen or freeze-dried foods like Mysis shrimp, krill and other crustaceans.

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Hope this helps. Short answer, I don't really think they care. So no. I mean it just helps boost their color. Doesn't mean they prefer it.

yes they prefer brighter colors because they can see them better.

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indicate valleys, hills, steepness and gentleness of slopes.

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contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.