First look at the color of shrimp shells. Look at the color of lobster shells first. Generally, bright colors are better, crimson or black, which may grow in the sewer. There is also a kind of green shell shrimp, which is generally considered delicious. Second, look at flexibility. Secondly, catch up and see the flexibility of lobsters. Usually, fresh lobsters are struggling desperately, and almost motionless means they are dying. Third, look at the cheeks. If the color of gills is white, it means that the environment in which they grow is relatively clean; If it is black, it means that most of them live in sewage. Fourth, look at the tail. Finally, everyone is most concerned about the size of shrimp, and the tail accounts for a large proportion of the whole shrimp. This is also the most affordable and crucial part of eating lobster. Usually, the tail of female shrimp is fatter, and the claws of male shrimp are bigger. However, in view of whether it is better to choose male shrimp or female shrimp, the claw meat of male shrimp is particularly tender, and the tail is not necessarily less meat. If the mother shrimp is pregnant or postpartum, the meat quality will be loose.