This document provides information about shellfish including mollusks, crustaceans, and cephalopods. Mollusks are divided into three main types - bivalves like mussels and oysters, univalves like snails, and cephalopods like squid. Crustaceans have a segmented exoskeleton and include crabs and lobsters. The document discusses the anatomy, farming, and preparation of various shellfish types. It also covers storage, federal inspection programs, and proper cooking methods for shellfish.