((a)) If a desertion or casualty results in the loss of at least one seaman, the master shall engage, if obtainable, a number equal to the number of seamen of whose services the master has been deprived. The new seaman must have at least the same grade or rating as the seaman whose place the new seaman fills. The master shall report the loss and replacement to a consular officer at the first port at which the master arrives.
((b)) This section does not apply to a fishing or whaling vessel or a yacht.