"However, there is nothing 'evolutionary' in what the researchers observed and documented, in the sense of any evidence of mutation-derived increase in genetic information as microbe-to-man evolution requires. The killifish mutations were already present in the clean-water populations, ready for natural selection to act upon when the environment turned toxic. (Natural selection can only act upon existing genetic information, it can never generate new genes, therefore natural selection is not evolution, despite what the bait-and-switch tactics of some textbooks imply.) The mutations did not gain any new function but rather lost
function (the turning off of the aforementioned metabolic pathway). So the killifish survivors in polluted waters were actually 'losers'."
