cocoon

Today, an earthquake occurred around north-east of Hokkaido, the northernmost island of Japan. Fortunately, only a very minor tsunami hit the northern-east coast of Hokkaido. No damege reported.

Japan is geologically so active that many earthquakes have hit Japan. It won't surprise you that the people have developed lots of insightful superstitions about quakes. The most famous one would be that catfish can predict quakes. According to the story, they show unusual movements as a sign of quakes. Scientists suspect that it is not a groundless story. Compared to other freshwater fish, catfish are found to be much more sensitive to electromagnetic waves. Some abnormalities in electromagnetic waves are often detected before quakes actually happen. The unusual waves would affect catfish's behaviors.

I emailed to an aquarium to ask how their catfish had been doing before this equake happened. They answered they were just as usual.