including Leyte in the Philippines and Iwo Jima. They called them "octopus pots" (蛸壺, takotsubo) for a fancied resemblance to the pots used to catch octopuses
the pot is raised, the octopus will not normally try to escape. See also ja:蛸壺 and piège à poulpe in Tunisia. Soda bottle or glass jar trap In Haikou, China