Section 14.203 - Voyages upon which shipping articles are not requiredAlthough they may be used for the voyage; shipping articles are not required for any voyage by-
(b) A vessel engaged exclusively in fishing or whaling;(c) A vessel aboard which the merchant mariners are by custom or agreement entitled to participate in the profits or results of a cruise or voyage;(d) A vessel employed exclusively in trade on the navigable rivers of the United States; or(e) A ferry, or a tug used in ferrying, if the vessel is employed exclusively in trade on the Great Lakes, other lakes, bays, sounds, bayous, canals, or harbors.