Crabs are found all over the planet, and even in the Czech Republic, the invasive signal crayfish can be found in some places. They existed as long as 80 million years ago. They are hunted for their meat, mainly in China and Southeast Asia.

It contains vitamins B1, B2, B3, B6, B12, folic acid, vitamins D, E, C, A, and from minerals iron, magnesium, phosphorus, potassium, selenium, calcium, copper, zinc, and sodium.

This animal has a salty taste and a cold nature. It clears heat and moves the blood. It strengthens muscles and tendons and benefits the bones. It is not suitable to eat during pregnancy or when suffering from skin diseases.