Scientists at the SWFSC in the Marine Mammal and Turtle Division's Marine Turtle Research Program use stable isotope analytical techniques to investigate the trophic ecology, migrations, and stock structure of marine turtles throughout the Pacific Ocean. The Stable Isotope Laboratory at Southwest Fisheries Science Center consists of a tissue archive and lab space for pre-processing of all biological samples. The lab currently has over 1,500 marine turtle tissue and environmental (i.e. dietary) samples archived, the vast majority of which have been analyzed for stable-carbon and -nitrogen isotopes. All isotopic analyses are currently performed at the Scripps Institution of Oceanography Mass Spectrometer Facility , located within a short walk from SWFSC.