...nd marine mammals are exposed to PCBs via their consumption of prey. Generally, the typical PCB levels increase by a factor of 10- to 100-fold when ascending major consumption levels in a food chain (=-=Gobas et al. 1995-=-). Specifically, Wasserman et al. (1979) reported that for marine food webs, zooplankton range from < 0.003 µg/g to 1 µg/g, whereas top consumers, such as seals and fish, had ranges of PCB from 0.03 t...