In this subchapter, the following definitions apply:

(1) The term "Fund" means the Marine Mammal Unusual Mortality Event Fund established by section 1421d(a) of this title.

(2) The term "Office" means the Office of Protected Resources, in the National Marine Fisheries Service.

(3) The term "stranding" means an event in the wild in which—

(A) a marine mammal is dead and is—

(i) on a beach or shore of the United States; or

(ii) in waters under the jurisdiction of the United States (including any navigable waters); or

(B) a marine mammal is alive and is—

(i) on a beach or shore of the United States and unable to return to the water;

(ii) on a beach or shore of the United States and, although able to return to the water, is in need of apparent medical attention; or

(iii) in the waters under the jurisdiction of the United States (including any navigable waters), but is unable to return to its natural habitat under its own power or without assistance.

(4) The term "stranding network participant" means a person who is authorized by an agreement under section 1382(c) of this title to take marine mammals as described in section 1379(h)(1) of this title in response to a stranding.

(5) The term "Tissue Bank" means the National Marine Tissue Bank provided for under section 1421f(a) of this title.

(6) The term "unusual mortality event" means a stranding that—

(A) is unexpected;

(B) involves a significant die-off of any marine mammal population; and

(C) demands immediate response.