1, first knock the fish faint, evenly spread a layer of vinegar on the body of the fish, and then put the fish on a slightly larger plate,

2, starting from the tail of the fish, use your thumb to hold on to the tail of the fish scales along the rows of scales to push forward.

3. Starting at the tail, scrape another row, and after scraping one side turn the fish over and scrape the other side.

4, rinse the fish with water and it's ready to cook.