World Jellyfish Day 2025: 5 fascinating facts to know

World Jellyfish Day 2025: 5 fascinating facts to know Kaveri Amin Mid-Day Lifestyle By Kaveri Amin Published Oct 30, 2025 [{ "selector": ".imaoe-a", "duration": "1000ms", "fill": "forwards", "keyframes": [ {"offset": 0, "transform": "translateX(-309px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }]

World Jellyfish Day World Jellyfish Day is celebrated annually on November 3rd to raise awareness about the importance of jellyfish in marine ecosystems [{ "selector": ".imaoe-a", "duration": "1000ms", "fill": "forwards", "keyframes": [ {"offset": 0, "transform": "translateX(-309px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }]

Anatomy Jellyfish isn’t actually a fish. They do not have bones, a heart, or a brain-- only a central nervous system [{ "selector": ".imaoe-a", "duration": "1000ms", "fill": "forwards", "keyframes": [ {"offset": 0, "transform": "translateX(-309px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }]

Glow in the dark Some jellyfish glow blue or green in the dark using bioluminescent organs that light up on touch to scare predators [{ "selector": ".imaoe-a", "duration": "1000ms", "fill": "forwards", "keyframes": [ {"offset": 0, "transform": "translateX(-309px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }]

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