The Namazu was worshiped as a god after an earthquake in Edo. A Namazu-e is a subtype of Umizo-e. Since catfish can predict earthquakes, some believe this behavior inspired the creation of this myth.
The Namazu is now used as a symbol for earthquake-related events, operations, and more. The Pokémon Whishcash is a reference to the Namazu (more notable in Japan, where its name is Namazun). An episode of Pokémon featuring a Namazu was banned in Japan due to an earthquake that happened shortly before the episode was released.