Owner, with respect to any vessel, means:
(1) Any person who owns that vessel in whole or in part;
(2) Any charterer of the vessel, whether bareboat, time, or voyage;
(3) Any person who acts in the capacity of a charterer, including, but not limited to, parties to a management agreement, operating agreement, or any similar agreement that bestows control over the destination, function, or operation of the vessel; or
(4) Any agent designated as such by a person described in paragraph (1), (2), or (3) of this definition.
50 CFR § 600.10
Unless defined otherwise in other parts of Chapter VI, the terms in this chapter have the following meanings: