Answered by Ustadha Shazia Ahmad
Can we eat shellfish?
Shellfish is a large family of crustaceans that vary from one another quite a bit. They include, lobsters, oysters, shrimp and so forth. Muslims can only eat the shellfish that live in water alone. Therefore, the wood louse, blue crab and land snails, which are shellfish that live on land and in water, are impermissible to eat. But, shrimp and lobster are permissible to eat because they only live in water.
And Allah knows best.
Shazia Ahmad