They already have the capacity to walk on land and breathe air. It could spell disaster for native species in Australia, scientists warn. The new findings may help explain how the ancient fish ancestors of humans colonized the land, the researchers said. Air-Breathing While lungfish breathe air through their lungs and armored catfish breathe air through their gut, other amphibious fishes have different methods of extracting oxygen from the air. An unusual species of fish that can walk and breathe air shows that these animals may be more capable of adapting to life on land than previously thought, researchers say. Even though axolotls do have a capacity to breathe air, they won’t survive outside of water for prolonged periods. An unusual species of fish that can walk and breathe air shows that these animals may be more capable of adapting to life on land than previously thought, researchers say. The researchers from the McGill University in Canada used 111 young Polypterus senegalus - an African fish also known as a "dinosaur eel" - for the experiment, because they are quite similar to the ancient fish that evolved to walk on land 400 million years ago. The fish can breathe air and survive on land for up to four days out of water if they remain wet, according to National Geographic. The northern snakehead is not alone in this ability: Walking catfishes, lungfishes, and betta fish can all breathe air directly as well. Polypterus is an African fish that can breathe air, “walk” on land, and looks much like those ancient fishes that evolved into tetrapods. They can grow up to three feet long and breathe air, allowing them to survive on land. Axolotls are aquatic animals, and have adapted to live in the water. The aggressive climbing perch is a freshwater fish that can walk on dry land, breathe air with lungs, and tolerate saltwater. Snakehead fish : This family of fish are obligate air breathers, breathing air using their suprabranchial organ, which is a primitive labyrinth organ. Reproduction and rearing young Some fish, like the arapaima, have gas bladders that are surrounded by blood vessels to enable air-breathing. Thus, they can’t live outside water, and won’t survive on land for long. Snakehead fish survive in freshwater, The Times reported. The answer is no, axolotls cannot live and walk on land. Polypterus is an African fish that can breathe air, 'walk' on land, and looks much like those ancient fishes that evolved into tetrapods. The fish travel by tossing their bodies side-to-side — an equivalent to walking — according to National Geographic.
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