Yet they have a hard time explaining what drove those fish to evolve from a perfectly good torpedo shape to a re-formed sideways pancake, and they didn’t have any examples of fossilized transition organisms. They think that today’s flatfish evolved from bilateral (commonly shaped) fish. Evolutionary theorists try to explain how and why these assymetrical organisms came to be. Flatfish create a stumbling block for evolutionary theory. So we can say that flatfish are extraordinary creatures.īut they help us understand more. Its transformed head and body enable it to live this way, feeding as a bottom-dweller for the rest of its life. This way, the colored, two-eyed side faces up, and the blind, bland-colored side faces down. At the completion of this metamorphosis, the flatfish no longer swims in the water column but settles out to the floor. Additionally, the newly eye-less side of its body bleaches out, while the double-eyed side takes on a patterned coloration so that it blends with the ocean bottom. The fish starts to swim in a tilted manner. One eye starts to MIGRATE from one side of its head to the other side so that it has two eyes on the same side of its face. When a flatfish begins to mature, the bones in its skull twist and move around.
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