Coral, on which the puffer fish lays its eggsThe puffer fish is dioecious, so there are males and females. They are found around the coasts of Japan and China, often in the Sea of Japan, East China Sea and the Yellow Sea. The Japanese puffer fish leaves the brackish waters, and ventures to the shallows of the coast to deposit its eggs. The eggs are fertilized externally and attach to rock and coral at the depth of around 20 m, from the months of March to May. The adult Japanese puffer fish do not stay and guard their eggs, they are scattered and then left.