According to the biblical dietary laws outlined in the books of Leviticus and Deuteronomy, observant Jews are explicitly prohibited from consuming shellfish, bottom-feeders, and marine creatures that lack both fins and scales. Shrimp, crabs, lobsters, and oysters fail to meet these strict anatomical requirements, classifying them as non-kosher species. Consequently, traditional Jewish dietary practice excludes all forms of shellfish from being prepared, cooked, or eaten.