Scaled fish. I'm not a scientist, not a biologist, a medical scientist, but from a young age, I feel that my mother said that fish without scales are more nutritious than fish with scales. But I think the nutritional value of fish is not reflected in the absence or presence of scales, it should be divided into the type of fish, living area (freshwater fish and saltwater fish, deep-water fish and shallow-water fish), color and so on, can not just one-sided to judge.