![]() ![]() Most animals have one copy of these gene, while these fish have five.Įven moving chemicals into and out of cells can be difficult at these high pressures. The team found that the fish have high levels of a substance called trimethylamine N-oxide (TMAO), which is used to stabilize proteins. Such high pressures can also break down proteins, which are important for normal physiological processes. Wang says this makes their bones more flexible and likely more able to withstand pressure. This mutation renders the gene partially nonfunctional. In fact, the team found that the fish have a mutation in the primary gene responsible for calcification, the buildup of calcium to harden the bones. What’s more, their bones are not entirely made of, well, bone-but are largely cartilage. First author Kun Wang, from the Northwestern Polytechnical University, says this “may help the internal and external pressures to be balanced.” In other words, if the fish had a complete and fused skull, it would be crushed by the pressure. For one, the fish have gaps in their skulls. (See how some deep-sea fish blend in with the darkness.) ![]() The team picked up specimens from around 23,000 feet below sea level using remotely-operated landers, and analyzed the creatures’ genes, proteins, and anatomy. In a study published in Nature Ecology & Evolution, Chinese researchers examined the anatomy and genetics of the fish. How does an animal make a living in such an extreme place? (See " How the Mariana Trench Became Earth's Deepest Point.") ![]() In the Mariana Trench-7,000 meters below the ocean’s surface-these fish makes a living in total darkness and at crushing pressures that can reach 1,000 times more than at sea level.īut the Mariana snailfish is not only abundant in this area it’s the region’s top predator. At the deepest point in the ocean lives a fish that is pink, slimy, and looks a bit like an oversized tadpole, up to a foot long. ![]()
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