To clean cotton fish, descale first: put the fish on the chopping board, pat it with a knife a few times, be careful not to use too much force, pat it as evenly as possible, and then scrape the scales from the tail to the head with a spoon, so that all the scales can be scraped off slowly and easily. To protect your hands, you'd better put on gloves.

Fish gills are organs that filter waste when fish breathe. They have a strong muddy smell and must be cleaned up, otherwise it will affect people's appetite. Some can scrape the gills off with a knife, and some can also cut them off with scissors. Then chop off the fish head, throw the fish out of the stomach, and pull out all the internal organs, so that it is perfect to present a clean state inside.

The nutritional value of fish is that it is rich in minerals such as protein, thiamine, nicotinic acid, fat, vitamin D, calcium, iron and phosphorus, which is very beneficial to human health. Protein contained in fish is high-quality protein, which can supplement the needs of human body and enhance human body's physique. Most of the fat contained is unsaturated fatty acid, which has a good anti-arteriosclerosis effect and is good for preventing cardiovascular and cerebrovascular diseases. Eating fish regularly can promote bone development and prevent osteoporosis.