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Crayfish are eaten all over the world. Like other edible crustaceans, only a small portion of the body of a crayfish is edible. Like all crustaceans, crawfish are not kosher because they are aquatic animals that do not have both fins and scales. They are therefore not eaten by observant Jews.
Moreover, is eating crawfish bad for you?
Reames says the second myth is that crawfish don't fit in a heart-healthy eating plan. But because crawfish are low in fat, saturated fat, trans fat and calories and are high in protein and minerals, they can be included in the diet of anyone who is concerned about cholesterol, fat or calories.
Secondly, what crawfish should you not eat?
One of the first things you learn at a crawfish boil is do not eat the straight-tail crawfish. Supposedly, straight tail crawfish were dead before the boil and are therefore not safe to eat.
The tiny morsel of edible meat that a crawfish produces is located in its tail. When you're attending a crawfish boil or eating a pile of mudbugs at a restaurant, many people just pinch off the tail, squeeze out the meat, and eat it, leaving the crawfish head behind.