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Pretending to be Blue Tears: Japan’s Firefly Squid Illuminating the Coast with Cold Light

Published: 2026-09-25 👁 100 views
Last updated 2026-09-25 — The period from April to August each year is the prime season for the blue tears phenomenon in Matsu, where the coastline emits a faint blue glow with the crashing waves—a dreamlike, fantastical scene that is one of the most unmissable sights of summer. A similarly mysterious blue light spectacle also occurs every...

By the MOOK Scenic Spots Home Travel Life Network Editorial Team
 

The period from April to August each year is the prime season for the blue tears phenomenon in Matsu, where the coastline emits a faint blue glow with the crashing waves—a dreamlike, fantastical scene that is one of the most unmissable sights of summer. A similarly mysterious blue light spectacle also occurs from March to June each year along the coast of Toyama Bay in Japan, except here the blue glow is not caused by blue tears but by countless gatherings of bioluminescent firefly squid.

Every year from March to June, Toyama Bay sparkles romantically with tiny lights. (Image source: viralnova)

The specks of blue light come from firefly squid. (Image source: snipview)

A different kind of dreamy blue-lit coast compared to blue tears. (Image source: snipview)

Blue light dragged up while catching firefly squid. (Image source: whenonearth)

The bioluminescent coast of Japan’s Toyama Bay differs from Matsu’s blue tears, which are produced by glowing plankton. Instead, it comes from tiny 7-millimeter-long firefly squid. These squid possess complex skin and eye photophores that convert absorbed moonlight into blue light to attract prey. They mostly live on the seabed but rise to the surface during their spawning season from March to June. During this time, visiting the Toyama Bay coast at night allows you to see the squid lighting up the entire shoreline, as individual bioluminescent squid drift with the currents, creating a unique view that attracts many visitors.

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http://www.mook.com.tw/article.php?op=articleinfo&articleid=10413

 

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