Industrial polychlorobiphenyls (PCBs) and the DDT family (t-DDT) were measured in several species of organisms collected from the open Atlantic Ocean between 66°N and 35°S latitude. All the organisms had higher concentrations of PCBs than t-DDT. Many trophic levels were represented in the collections, but the analytical data offer no support for food chain magnification among gilled organisms....
Harvey, George R., Helen P. Miklas, Vaughan T. Bowen, and William G. Steinhauer. 1974. "Observations on the distribution of chlorinated hydrocarbons in Atlantic Ocean organisms." Journal of Marine Research 32, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1281