We can stew together. Crucian carp is a little more expensive and has many fishbones, which makes it more troublesome for children to eat. Black herring is a kind of cheap seafood with few fishbones, but it is rich in nutritional value. DHA and EPA are higher, the former is beneficial to intelligence, while the latter is beneficial to cardiovascular and cerebrovascular diseases. In addition, protein and other trace elements are also very rich.