No, the crop circle-inspired design you see above was not created by aliens, but rather a tiny Japanese puffer fish. That’s right, tiny silvery male puffer fishes are responsible for making the beautiful and elaborate underwater crop circles to attract a mate. They use their pectoral fins to carve an elaborate series of rings and ridges in the sand. Since they are constantly washed away by water flow, the tiny fish must constantly maintain them. The more elaborate the underwater ‘crop circle’ mating ring, the more likely the male puffer is to attract a female counterpart. Continue reading for a video and more information.
“The pair of fish lay their eggs in the center of the mating ring and it is hypothesized that the relief of the sand crop circle / mating ring help to affect the water flow in the center where the eggs are laid,” according to Reef Builders.