In fact, now many restaurant owners are in conscience to make money,, put what we do not know,, but now the business in order to make money. But now the businessmen in order to make money,, what things are there, such as fight incense, color,, seasoning 、、、、 and so on. But boiled fish fillet inside is must by the bean paste,, there may be that the home of the bean paste is the kind of additives, like now the market stores are sold, very big cans and very cheap,, the color is very red,,, but after cooling will change color. It should be the kind of phenomenon you are talking about, and the white fish fillets on top may be the reason why they are coated with starch! I hope that answers your question