The effect of crucian carp is as follows: 1, it can promote water and swelling, for people with edema and ascites, if you eat crucian carp properly, it can promote urination and swelling; 2, it can promote blood circulation and milk secretion, for people with insufficient milk secretion after delivery, if you eat crucian carp properly, it can promote blood circulation and milk secretion; 3, it can strengthen the spleen and stomach, for people with weakness of spleen and stomach, with less nasties and stomach problems, if you eat crucian carp properly, it can strengthen the spleen and stomach. If you want to eat crucian carp, it is good for your spleen and stomach. The contraindication of crucian carp is to control the intake of crucian carp for those who have kidney dysfunction, otherwise it will cause too much protein intake and increase the burden of kidney.