
The earliest historical records of the link between namazu and earthquakes is from the end of the 16th century.It is known that this belief was maintained over the centuries because it every time there was a strong earthquake, large quantities of woodblock prints inspired by the giant catfish were sold. and other catfish in the most varied scenes.
This style of visual production is known for namazu-eand is a subgenre of the ukiyo-e.
An interesting curiosity about catfishes is that they are very greedy. They can swallow another fish of the same size.
I have seen a video where a catfish did it, I think it didn't take a couple of minutes to gobble it up, and its body was totally stretched out because it had eaten another fish with dimensions practically the same as its own. I was very impressed and I couldn't resist drawing a catfish accomplishing this feat.