为什么马里亚纳海沟最深处没有鱼？

Previous posts: 它不是普通洪水：尼泊尔灾难背后的冰岩崩塌 790万年前，一片比地中海还大的海突然消失了｜副特提斯海之谜 The Mariana Trench reaches a depth of nearly 11,000 meters. There is no sunlight there, the water temperature is close to freezing, and the pressure is nearly 1,000 times that at the surface. But after the deep-sea lander reached the bottom of the trench, it found that it was not a lifeless desert. Amphipods quickly gathered around the bait, and microorganisms lived in the seabed sediment. Strangely—the fish were gone. Currently, the deepest fish images captured by humans have reached approximately **8,336 meters**, but as one continues to descend to 9,000 meters, 10,000 meters, and even the Challenger Deep, it becomes increasingly difficult to see fish that have long inhabited those areas. Why? This video takes us from the surface down to the Mariana Trench, showing how deep-sea fish adapt to increasingly extreme environments: How sunlight disappears How ocean snow becomes deep-sea food Why fish aren't directly "flattened" by the immense water pressure How high pressure affects proteins and cell membranes Why do Mariana snails have soft, translucent bodies? How does TMAO help proteins resist high pressure? Why might this protective mechanism ultimately limit fish from further descent? While fish stop at around 8,000 meters, amphipods and microorganisms can still continue descending. The limits of fish are not the limits of life. Even more surprisingly, scientists have even discovered microplastics and synthetic fibers from the human world within the bodies of amphipods near the deepest parts of the ocean. The Mariana Trench is far away from us, but it is not truly isolated from the Earth's surface. Chapter Timestamps 00:00 Life Still Exists at 11,000 Meters Deep 02:18 The Deep-Sea World After Sunlight Disappears 05:01 Why Aren't Deep-Sea Fish Crushed? 07:59 Entering the Ultra-Deep Zone 10:21 How Does the Mariana Snail Adapt to High Pressure? 12:05 TMAO: The Protein Protection Mechanism of Deep-Sea Fish 13:05 Why Do Fish Stop Reaching Over 8,000 Meters? 15:50 After Fish Disappear, What Life Can Continue? 18:23 What Do They Eat at the Deepest Point of the Trench? 19:05 Human Pollution Has Reached 10,890 Meters 20:23 The Final Answer: Why Are There Animals, But No Fish? Music by Kevin MacLeod (incompetech.com): "Anguish" "Echoes of Time" "Blue Sizzle" Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b... #MarianaTrench #DeepSea #DeepSeaLife #Science #Ocean