; and (ii) does not mean a normal or cyclical variation in a species distribution or stock abundance. (F) 12-month revenue loss The term 12-month revenue loss means the percentage reduction in commercial, charter, headboat, and processor revenue for the 12 months during the fishery resource disaster period that is due to the fishery resource disaster, when compared to average annual revenue in the most recent 5-year period or equivalent for stocks with cyclical life histories. (G) 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. (2) General authority (A) 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 subsection in accordance with this subsection. (B) 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 paragraph (9) 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) Savings clause The requirements under this subsection shall take effect only with respect to requests for a fishery resource disaster determination submitted after the date of enactment of the Fishery Failures: Urgently Needed Disaster Declarations Act. (3) Initiation of a fishery resource disaster review (A) Eligible requesters Not later than 1 year after the date of the conclusion of the fishing season, 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