Eriocheir sinensis is not only edible, but also has high nutritional value. For example, Panjin river crabs and hairy crabs belong to a kind of harmony, and the most important thing is the river water, which has no pollutants. Now the river crab in Panjin is famous all over the country, because the river crab raised in Panjin is cultivated in paddy fields, which is pollution-free, and the river crab is huge, not because of its high nutritional value. Therefore, it is no problem to choose the river crabs cultivated in the field.