How to choose healthy shrimp?

When we buy shrimp, we must know how to distinguish its freshness. When we eat seafood, we eat the word "fresh". The fresher the shrimp, the more delicious it tastes. On the contrary, it will lose its umami flavor and the meat will be "moldy". Recently, some related media reported that shrimp can be bought for a few yuan a catty in some markets, and the original price is tens of yuan. Why is it so cheap? Some experts pointed out that this is because some of these cheap shrimps were found to have fish medicine residues, such as chloramphenicol. Therefore, it can only be sold at a reduced price, and because of the lack of management and testing means in the aquatic products market, such cheap shrimp can be sold in large quantities in the market, and people who are greedy for cheap actually become victims. You must pay attention to observation when buying shrimp. Generally speaking, sick shrimp fed with medicine will have some black and white spots on their skin and black cheeks.