It is impossible to raise razor clam quickly with urea. According to relevant public information, urea can replace some nutrients in the cultivation of freshwater Agkistrodon, but it can't make the cultivated freshwater Agkistrodon grow rapidly. Jellyfish is a marine shellfish. Molluscs. There are two shells, long and narrow in shape, with egg-yellow outside and white inside. They live in coastal seawater and can also be cultured artificially, with delicious meat. There are cricket and cricket.