Rnz: Our Changing World

During World War II, sonar operators discovered a ‘false seabed’ that appeared to move upwards during the nighttime. In fact, the sound waves were bouncing off huge numbers of small critters. This daily movement is the largest animal migration on the planet, consisting of deep-water animals that hide in the ocean’s twilight then move to the surface after sunset to feed. By far the most abundant fish in this crowd are the lanternfishes. New Zealand researchers are investigating what impact lanternfish migration has on the life cycle of fish we like to eat, and how it may also play a huge role in the Earth’s carbon cycle. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Guests:Professor Jeff Shima, Victoria University of WellingtonAlisha Gill, Victoria University of WellingtonNiamh Smith, Victoria University of WellingtonLearn more:Read the article for this episode: Lanternfish: small fish, big impactBelow the twilight zone, in the deepest parts of the wor