The Japanese Mitten Crab (eriocheir grapsidae) lives in rivers, lakes and lagoons, and goes down to the sea to lay its eggs in autumn and winter. It lives all over Japan except for the Ogasawara Islands. In Hakui City, it lives in Ôchigata Lagoon. It grows to a width of 7~8 cm and weighs up to 180g. In Japan, it is called mokuzu (alga) crab, since its chelophore is covered by thick cilia. It is similar to Shanghai crab and is also known as the Japanese Shanghai crab. As a dish, it can be steamed or boiled, and is often put in soup or cooked with rice.