The Marine Mammal Protection Act (MMPA) directs the National Marine Fisheries Service (NMFS) to monitor the recovery of pinniped populations and to define their role in the ecosystem. To meet this mandate, the National Marine Mammal Laboratory, Washington Department of Fish and Wildlife, and Oregon Department of Fish and Wildlife request a research permit to investigate the abundance and distribution, disease, contaminant loading, life history parameters, genetics, and foraging ecology of Pacific harbor seals (Phoca vitulina), California sea lions (Zalophus californianus), and northern elephant seals (Mirounga angustirostris) found in Washington, Oregon and adjacent waters. Up to 30,000 harbor seals, 8,000 California sea lions, and 100 elephant seals may be incidentally taken up to 30 times annually during aerial, boat and ground surveys. Up to 250 Steller sea lions (Eumetopias jubatus) may be incidentally taken up to 20 times during aerial and boat surveys. Up to 100 killer whales (Orcinus Orca) may be incidentally taken up to 2 times during playback experiments. Up to 20,000 harbor seals, 8,000 California sea lions, and 100 elephant seals may be taken incidentally during captures, scat collections and dead pup surveys. Up to 750 harbor seals, up to 600 California sea lions, and up to 50 northern elephant seals may be taken annually by capture; tagging, branding or dye-marking; physical restraint or gas anesthesia; instrumentation; tissue biopsy; tissue and/or blood sampling; milk sampling. Up to 500 California sea lions may be taken during acoustic playback experiments. Requested duration of this permit is 5 years from October 2009 to September 2014.