Oceans

15 Bizarre Ways Marine Life Uses Sound, Light, and Electricity to Communicate

November 23, 2025 · Gallery · 16 slides

13. Morse-Code Shimmering of Sardines

15 Bizarre Ways Marine Life Uses Sound, Light, and Electricity to Communicate — Sardines are small epipelagic fish that sometimes migrate along the coast in large schools. They are an important forage fish for larger forms of marine life. Source: Wikipedia

Sardines in schools flash their silvery sides in a synchronized ‘Morse code’ that transmits information to group members or confuses attacking predators. These rapid light reflections allow instant group coordination. Details via Oceans Today.

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13. Morse-Code Shimmering of Sardines

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