If the raw tuna is white, then this tuna should be small and of poor quality. ...

If the meat is cooked, the color is white.

Generally speaking, big tuna is sashimi;

Small tuna can be canned or boiled ~

2. Some cod in the supermarket are very expensive, a catty costs more than 100 yuan, and some are very cheap. What is the reason? In fact, those cheap cod fillets are not real cod, but fish commonly known as oily fish. This kind of fish has low edible value and belongs to low-priced fish. Because of its high oil content, it is mainly used for refining industrial lubricants. The real cod should have a fat content of less than 5%, instead of this fish called oily fish, which has a fat content of as high as 20% and contains a natural wax ester. Because wax ester is difficult to digest in human body, it may lead to oil discharge after eating.

Real cod is expensive. According to my experience in buying cod, the cod with a price above 100 yuan is the real cod. The marked price I bought is 2 16 yuan per kilogram, and a bag is about 100 yuan. The fish pieces are neat, white in color and firm in meat, while other cod pieces are divided into two types, namely dragon cod and other cod. The price in dragon cod is generally around 40 yuan, and the meat is tight.

There is also a kind of cod, which is very similar to silver cod. Buron cod is cheaper, but the meat is not very regular, looks a little dirty and smaller. The price is about 20 yuan per bag. I seriously doubt that this is an oily fish, because it has the feeling of soft collapse as mentioned in the magazine. The thawed meat is softer. It tastes very loose.