(translated from www.aquariophilie.org)

A Tetraodon uses sand to make underwater art. Mysterious geometric shapes were observed on sandy bottoms of Amami Oshima by 24 meters deep in the south of Japan. Looking more closely, divers found a small puffer fish was responsible for these works of masterful art and managed to film the artist in action!

This fish created these sand sculptures to attract potential partners . Scientists have observed that over the nesting area , the more likely it is to attract the attention of females . The females swim amid these geometric figures and lay their eggs in the center of the nest .

Scientists have discovered that complex patterns have a hydrodynamic effect! The ribs and grooves help to minimize the current in the center of the nest , which protects the eggs turbulence and protect them from predators .