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Pseudo Blue Tears: Japan’s Firefly Squid Illuminates 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. This dreamlike, fantastical scene is one of the most unmissable sights of summer. A similarly surreal blue light spectacle also occurs every...

Text by MOOK Scenic Spots Family Travel Life Network Editorial Team, compiled and reported
 

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. This dreamlike, fantastical scene is one of the most unmissable sights of summer. A similarly surreal blue light spectacle also occurs every year from March to June along the coast of Toyama Bay in Japan, but here the blue light is not caused by blue tears—it’s created by countless glowing firefly squid gathering in massive numbers.

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

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

A departure from the dreamy blue-lit shores of blue tears. (Image source: snipview)

The blue light trail as firefly squid are caught. (Image source: whenonearth)

The bioluminescent shores of Japan’s Toyama Bay differ from Matsu’s blue tears, which are produced by bioluminescent plankton. Instead, they come from tiny 7-millimeter-long firefly squid that possess complex skin and eye light organs. By absorbing moonlight and converting it into blue light, they attract prey. Most of their lives are spent on the ocean floor, but they rise to the surface during their spawning season from March to June. During this time, visiting the shores of Toyama Bay at night allows you to witness the squid lighting up the entire coastline. Countless glowing squid drift with the currents, creating a unique spectacle that draws many tourists.

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

 

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