Crayfish is a strange creature, and its internal organs are all in its head. Crayfish has strong adaptability, and lives in some ditches with poor water quality for a long time, so after a long time, there will be a lot of heavy metals in crayfish, and crayfish will discharge these heavy metals through their shells, but not all of them can be discharged, and the remaining heavy metals will remain in crayfish. But because the internal organs of crayfish are in the head, these metals are basically in the head of crayfish, which is why I don't recommend eating crayfish heads.
Of course, the yellow thing on the head of crayfish is not only internal organs, but also shrimp yellow. The so-called shrimp yellow actually refers to the eggs of crayfish. This kind of shrimp yellow is actually very nutritious, but it is a pity that the viscera of crayfish and shrimp Huang Dou are yellow, but one color is darker and the other color is slightly lighter, so it is difficult for us to tell them apart. If we eat it wrong, it will do great harm to our health.
If a large number of heavy metals are absorbed by our human body, it will be absolutely disastrous for the human body, so for the sake of safety, I personally don't recommend eating crayfish heads. When we wash crayfish, we can remove the black tendons from the tail of crayfish, then pinch off the head of crayfish, or we can directly buy shrimp tails to eat.