mollusks — any invertebrate of the phylum Mollusca, typically having a calcareous shell of one, two, or more pieces that wholly or partly enclose the soft, unsegmented body, including the chitons, snails, bivalves, squids, and octopuses.
shrimp — any of several small, long-tailed, chiefly marine crustaceans of the decapod suborder Natania, certain species of which are used as food.
barnacles — nose pincers for controlling an unruly horse
crayfish — A crayfish is a small shellfish with five pairs of legs which lives in rivers and streams. You can eat some types of crayfish.