There is a black line on the back and abdomen of each shrimp. The black line on the back is the intestine of the shrimp, which is what we usually call shrimp line or shrimp intestine, and all of them are things that the shrimp has not excreted. The things in the shrimp line are not only dirty, but also contain some toxins harmful to health, which must be removed before cooking or eating.

There is also a black line on the belly of shrimp, which is actually shrimp tendon.

When cooking with shrimp, we will also find that shrimp will bend into an arch after being heated, which is caused by the shrinkage of shrimp tendons after being heated. Therefore, in some shrimp dishes that need to maintain a straight shape, this shrimp tendon must be broken before cooking. There are two ways to break the shrimp tendon.

First, put the shrimp belly down on the chopping board and flatten the shrimp body down, thus breaking the shrimp tendon.

Second, use a knife to draw a few knives on the belly of the shrimp and cut off the shrimp tendons. Because the prawns that have just been caught from the sea or fresh prawns in the supermarket basically have no excrement in their bodies, the shrimp line is actually the intestine of the shrimp, which is relatively clean and does not need to be removed. If the shrimp line is pulled out, the structure of shrimp meat will change greatly in the process of cooking. The meat tastes a little hard and not so smooth, which not only loses more nutrients, but also deteriorates the taste. If you clean prawns directly, and then cook them on fire, you can keep them fresh to the greatest extent!

However, if it is freshwater crayfish, it is necessary to remove the shrimp line, because there are many parasites in fresh water, and crayfish like to live in a dirty environment, and the sources of food are very diverse, and parasites are easy to appear in the body. Therefore, for the sake of health, the shrimp line of crayfish must be cleaned up.