Great one.. excellent question.. You know.. I have never thought about that.. and have never seen any studies or ideas solving that.. I am not saying there aren't any.. but i have never come across one. I am sure the problem is not insurmountable. I will make a point of getting some answers for you! I presume it will have something to do with certain fish types today being highly specialized, and that in the past, their dna would have been less specialized. Just taking natural selection backwards. (This is by no means a creationist scientific answer) Just an off the cuff stab at one, before going to sleep... Darn night shifts...
Andre
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