I think, boiling crucian carp soup needs about 1 hour. Only in this way can the nutrition of the fish good out, if the time is short will not be the nutrition of the fish only boiled out. So it must take about 1 hour to get all the nutrition of the fish. To achieve the ultimate, and then there is the simmering of fish soup must be boiling water in the pot. Can not use cold cold water under the pot. Only boiling water in the pot to escape the white color of the carp carp thick juice.