2, sea urchin, living in shallow sea bottom, like to stay on rocks or beaches, if the environment is suitable, its life can reach 200 years. The sea urchins in Dalian mainly include purple sea urchin (commonly known as thorn pot), horse manure sea urchin and yellow sea urchin (also known as sea hedgehog). However, because the yellow sea urchin is yellow in color, it still loves to lose its thorns, so it is rarely served, so it is mainly eaten in restaurants.