Off of Amami Oshima Island in Japan a remarkable discovery has been made. Striking patterns - concentric rings two meters in diameter with radiating ridges and grooves were discovered by an underwater cameraman Yoji Ookata but no one knew how they were created. Now we do thanks to researchers from Japan's Natural History Museum and Institute. A new, and as yet undescribed, species of pufferfish within the genus Torquigener is the artist that creates these underwater structures. A male fish takes a week to build this nest by using his fins to create the ridges which direct finer sediment to the center of the nest. He finishes off by decorating the radial ridges with larger shells and coral fragments. All this work to attract a female who, if she likes the aesthetics of the nest, will lay her eggs in the center which are then guarded by the male until they hatch, approximately six days later. Once the brood hatches the male must move elsewhere and build a new nest since ocean currents slowly erode his original construction.
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