![]() Some organisms spend their lives in its shadowy depths, while others travel to and from the surface every day in the largest animal migration on Earth. Recent studies suggest that the biomass of fish in the twilight zone may be ten times greater than previously thought-more than in all the rest of the ocean combined.Īnimals in the twilight zone range in size from microscopic to among the largest on the planet. Also known as the midwater or mesopelagic, the twilight zone is cold and its light is dim, but with flashes of bioluminescence-light produced by living organisms. It lies 200 to 1,000 meters (about 650 to 3,300 feet) below the ocean surface, just beyond the reach of sunlight. The ocean twilight zone is a layer of water that stretches around the globe. Other Expeditions Highlighting WHOI Research.Expedition to Stellwagen Bank National Marine Sanctuary. ![]() ![]() How do polynyas help feed emperor penguins?.Why is pressure different in the ocean?.What’s the difference between climate and weather?.
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