Under normal circumstances, the yellow on the head of crayfish is shrimp yellow, so it is best not to eat it. The head of crayfish contains many main organs, and the metal content will be relatively high, so it is not suitable for eating, otherwise it will easily have adverse effects on the body.

The yellow substance in the head of crayfish is shrimp yellow.

When the mother shrimp reaches maturity, the head and neck will contain shrimp yellow, so the shrimp with shrimp yellow must be the mother shrimp, but without shrimp yellow, it is not necessarily the male shrimp, and the mother shrimp is immature and can't see the shrimp yellow. Most people are familiar with crab roe, but seldom know shrimp roe. The mother shrimp contains shrimp roe in its head and neck before she conceives eggs, commonly known as "red-headed baby". Eating lobster, in addition to shrimp meat, tempting shrimp yellow is also a favorite of many people. Lobster head, gills, intestines, and shrimp yellow, which many people like best, are best removed and not eaten. According to experts, the main organs such as gill, liver and stomach of crayfish are concentrated in the head, and food and water flow pass through and stay in the head. The heavy metal content in the head of shrimp is often higher than that in the tail of shrimp, and shrimp yellow is the gonad of lobster, which is easy to be polluted together with the liver. Therefore, it is best to eat less shrimp yellow.