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Killer Whales (Orcas) in Alaska Several of the following are PDF files which require free Adobe Acrobat Reader software to view, navigate and print. Adobe also offers free tools for the visually disabled. AT1 Stock Status Killer whales. Photo: Jan Haaga, NOAA Fisheries Petition and Actions to Designate AT1 Group as Depleted 69 FR 31321, June 3, 2004. Final rule to designate the AT1 group of transient killer whales as a depleted stock of marine mammals. Effective July 6, 2004. Stock Assessment Reports Research Killer whales as predators in the Gulf of Alaska, Aleutian Islands and Bering Sea, 2007 Documentation of Sea Otters and Birds as Prey for Killer Whales, Marine Mammal Science, 22(1): 201–205, January 2006 Killer Whale Surveys in Western Alaska, June/July 2005 Killer Whale Predation on Belugas in Cook Inlet, Alaska: Implications for a Depleted Population, Marine Mammal Science, 19(3):529–544, July 2003 Surveying Killer Whale Abundance and Distribution, 2001-2003 Killer Whale Research in SE Alaska, 1998 Killer whales. Photo: Amy Martins, NOAA Fisheries Additional Information Killer Whale Facts How to Report Marine Mammal Strandings