United States Government Publishing Office publisher pbl distributor dst United States Government Accountability Office Resources, Community, and Economic Development Division author aut Government Organization text government publication eng GAOREPORTS Legislative Agency Publications gao legislative 2010-08-12 U.S. Government Printing Office 1993-09-10 monographic deposited born digital GA 1.13:RCED-93-204 https://www.govinfo.gov/app/details/GAOREPORTS-RCED-93-204 P0b002ee180394b49 f:rc93204 DGPO 2010-08-12 2011-03-24 GAOREPORTS-RCED-93-204 machine generated eng fdlp REPORT GAOREPORTS-RCED-93-204 RCED-93-204 Endangered species Wildlife conservation Seals (mammals) Wildlife management Environmental legislation Environmental policies Anadromous fishes Fishes Marine policies Ballard Locks (WA) Columbia River (WA) Maine Puget Sound (WA) Snake River (ID) Columbia River Basin (WA) Lower Granite Dam (WA) Narraguagus River (ME) Dennys River (ME) Machias River (ME) East Machias River (ME) Pleasant River (ME) Other Written Product RCED

According to government officials, the hunting of steelhead salmon by California sea lions at Ballard Locks in Seattle, Washington, is the only documented case in which predation by one species is threatening the existence of another, although federal officials suspect that the adverse predation of fish by protected seals may also be occurring at the Columbia River and in the state of Maine. Efforts to counteract the predation at Ballard Lock, including relocating the sea lions and driving them away from the locks, have been unsuccessful. Other possible options include capturing and holding the sea lions during the steelhead's migration and making structural changes to the locks and the accompanying spillway. The National Marine Fisheries Service has considered but rejected the possibility of controlling the sea lion population through lethal means. https://www.govinfo.gov/content/pkg/GAOREPORTS-RCED-93-204/html/GAOREPORTS-RCED-93-204.htm GAO/RCED-93-204 https://www.govinfo.gov/app/details/GAOREPORTS-RCED-93-204 Other Written Product GAO/RCED-93-204; Protected Species: Marine Mammals' Predation of Varieties of Fish; Endangered species Wildlife conservation Seals (mammals) Wildlife management Environmental legislation Environmental policies Anadromous fishes Fishes Marine policies Ballard Locks (WA) Columbia River (WA) Maine Puget Sound (WA) Snake River (ID) Columbia River Basin (WA) Lower Granite Dam (WA) Narraguagus River (ME) Dennys River (ME) Machias River (ME) East Machias River (ME) Pleasant River (ME) Title 16 Section 1361et seq. Title 16 Section 1531et seq. 16 U.S.C. 1361et seq. 16 U.S.C. 1531et seq.