That's right. Shrimp thread is the excretory organ of shrimp, which contains shrimp excrement such as feces, which is difficult to clean completely. It contains a lot of bacteria and is inedible. Eating it is harmful to human body, so it must be removed.

Lobster (scientific name: Palinuridae) is the general name of 4 genera 19 species of lobsters in crustacea, Arthropoda. Also known as prawns, leading shrimps, shrimps, sea shrimps, etc. Its head and chest are thick, its shell is hard, its color is colorful, its abdomen is short, its body length is generally between 20 cm and 40 cm, its weight is about 0.5 kg, and it is the largest kind of shrimp. The heaviest can reach more than 5 kilograms, and it is called lobster tiger. The body is thick and cylindrical, the back and abdomen are slightly flat, the head and breastplate are developed, thick and spiny, there are a pair of powerful supraocular spines in the center of the front edge, and there are closed gill chambers. Mainly distributed in tropical waters, it is a valuable seafood. Eight species have been found in China, among which freshwater lobster has a large yield.