Fish May Also Be Walking

While making observations over Africanlungfishes (also known as Protopterus annectens), scientists have found that they are using their pelvic spines to move in the water. Since lungfish is an intermediate link between fishes and the first amphibians, its ability to move in the water raises a theory that the eel-like lungfish steps in the water might have been the starting point for the amphibiousanimals walking evolution on the shore. Though lungfish’s fins more look like barbells, they perfectly allow the fish for locomotion in the water. Only hind limps of the lungfish are used to move it forward in the water. Even more, lungfishes may move in two ways – stepwise or in leaps. Researches supposed that the lungfish achieves this by filling water in

both  its lungs which in its turn reduces efforts made on the locomotion. Observations shown that lungfish continuously uses its fins for the motion and, in the contrary to the common quadruped animals, moves its fins asynchronously. In their turn, archeologists confirm that the steps lungfish leaves when “walking” are very similar to some patterns they have seen in fossil trackways.  There is however no proof for that the lungfish has made those trackways but the evidence from the latest study widens the pool of possible track-makers. Along with the primitive walking capabilities, lungfishes breathe mainly with their 2 lungs, rather than using the gills. Gills are still present in the body of the lungfish, but due to the disuse they have been atrophied and unable to process oxygen. So it seems that this type of fish is pretty much ready for getting out of the water and surviving on the shore.
source: www.ria.ru