Nutritional value scale skin derivatives on the surface of most fish. Fish scales account for 2% ~ 3% of fish weight. The scales are transparent in appearance, petal-like, slightly curled at the edge, white in luster, slightly fishy, firm and soft. The water content of fish scales is 16.4% ~ 17.8%, with an average of 17.5%. Nutritionists have found that fish scales are a special healthy food. It contains more egg scales, which can enhance brain memory and delay cell aging. Fish phosphorus is rich in protein, fat and vitamins, as well as iron, zinc, calcium and various micronutrients necessary for human body, among which the contents of calcium and phosphorus are very high.