No, but the black line on the back must be removed.

The black line on the shrimp's abdomen is a shrimp tendon, which is the shrimp's abdominal artery and the motor nerve chain connected to it, and is edible. The reason why shrimp can bend their bodies and have the ability to bounce is to rely on this black line on the abdomen, the shrimp tendon. All shrimp have tendons, not just lobsters. Shrimp tendon inside the shrimp blood and motor nerves, shrimp tendon is not dirty, cooking or eating before the general need to remove it.

Shrimp thread is on the back of the shrimp, which is a greenish-gray color. If according to the shrimp body structure, shrimp line is really dirty, because the shrimp line is also shrimp intestinal residues of some excreta, so when eating shrimp or recommended that we will remove the shrimp line. This is only in the hygiene to consider, and in terms of safety to consider, in fact, if you accidentally eat the shrimp line is also possible.

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Expanded Information

Shrimp Thread Precautions

This substance is not very clean, and even if you eat it, it will not harm your body. In the case of shrimp thread, after cooking and heating, the bacteria and other microbial substances in the thread are killed by high temperature. It is a safe food for the human body. Of course, the taste of shrimp thread is not very good, but there is no problem in safety.

Shrimp thread is actually the shrimp's intestines, and intestinal contents. Shrimp to the water microalgae, plankton and even sand as food, after digestion of the residue, provide little nutrition, but also because the sand affects the taste, but also may be a bit of heavy metals, so it can be removed the best.

References/baike.baidu.com/item/shrimp thread/9932485?fr=aladdin "target="_blank">Baidu Encyclopedia-Shrimp thread