The Chesapeake Bay Ketch is a type of boat that is used for harvesting oysters, estuaries, and crabs. The term 'Chesapeake Bay Ketch' is derived from the four words that make up its name: oysters (7 letters), ESTUARY (7 letters), CRAB (4 letters), and WOOF (4 letters). Oysters are a type of mollusk that live in estuaries, which are bodies of water where saltwater and freshwater mix. Crabs are crustaceans that live in both saltwater and freshwater environments. WOOF is a term used to describe the sound of a boat's engine.