Shrimp line refers to shrimp intestines, not the line on the back, which must be removed. The abdominal black line is the abdominal nerve chain, not the shrimp line. Shrimp line is the digestive tract of shrimp, on the back of shrimp. Some are very dark, some are very light, and they are almost invisible, which is related to the dirty things in them. Shrimp line will affect the taste, so some people will remove it.

Shrimp thread removal is not only because there are dirty things in the digestive tract of shrimp, but also because it affects the taste, especially when steamed in white and braised in wine. Shrimp thread contains bitter substances, which will mask the sweet taste of fresh shrimp under the action of heat. If it's spicy and stir-fried, it doesn't matter whether you go to the shrimp line or not because of its strong flavor.

Extended data:

Removal method of shrimp line:

1, method 1, insert a toothpick into the second section of the shrimp back, and directly pick out the shrimp line after cutting.

2, method 2, cut off the head and tail, squeeze out the shrimp line and dirty things by hand.

3, method 3, when picking the shrimp head, don't twist it off, slowly turn the shrimp head, and the shrimp intestines will be drawn out.

4. Method 4: Remove the head and shell of the shrimp, leave the tail of the shrimp, cut both sides along the back of the shrimp, and push the back of the shrimp away by hand. Do you see the shrimp intestines? Just take them out by hand.