; and (B) does not mean a normal or cyclical variation in a species distribution or stock abundance. (8) Overfishing The term overfishing means a rate or level of fishing mortality that jeopardizes the capacity of a fishery to produce the maximum sustainable yield on a continuing basis. (9) Secretary The term Secretary means the Secretary of Commerce. (10) 12-month revenue loss The term 12-month revenue loss means the percentage reduction in commercial, charter, and headboat revenue for the 12 months during the fishery resource disaster period when compared to average annual revenue in the most recent 5-year period or equivalent for stocks with cyclical life histories. (11) Undetermined cause The term undetermined cause means a cause in which the current state of knowledge does not allow the Secretary to identify the exact cause, and there is no current conclusive evidence supporting a possible cause of the fishery resource disaster. (b) General authority (1) In general The Secretary shall have the authority to determine the existence, extent, and beginning and end dates of a fishery resource disaster under this Act in accordance with this Act. (2) Availability of funds After the Secretary determines that a fishery resource disaster has occurred, the Secretary is authorized to make sums available, from funds appropriated under subsection (i) and from any supplemental appropriations that are available, to be used by the affected State, tribal government, or interstate marine fisheries commission, or by the Secretary in cooperation with the affected State, tribal government, or interstate marine fisheries commission. (c) Initiation of a fishery resource disaster review (1) Eligible requesters Not later than 1 year after the occurrence of a potential fishery resource disaster, a request for a fishery resource disaster determination may be submitted to the Secretary, if the Secretary has not independently determined that a fishery resource disaster has occurred, by— (A) the Governor of an affected State