Having no deck. Used of a ship or boat.; Decked vessels are those that have a fixed structural deck covering the entire hull above the deepest operating waterline. Decked fishing vessels data include trawlers, purse seiners, gill netters, long liners, trap setters, other seiners and liners, multipurpose vessels, dredgers and other fishing vessels, and non-fishing vessels such as motherships, fish carriers, fishery research vessels, etc.