Origins of the pale skin color in Europeans

[Anomalocaris]

How do you explain the skin pigmentation of people living thousands of kilometres from fish such as countries in the middle of Africa? Or are their diets still vitamin D rich anyways?

I always thought skin colour was a direct adaptation to how strong the sun was in that region..?

The idea that skin color correlates to sun light does not hold water. There are native Americans in tropical latitudes where Africans are darks as chocolate. There are native Americans in arctic latitudes where Europeans are white as snow. Yet native Americans seems to have done pretty well staying much the same color as each other.