PCB Contents in Several Species of Zooplankton Collected in the North Pacific Ocean

Abstract

Concentrations of polychlorinated biphenyls (PCB) were determined in four species of zooplankton collected from six locations in the North Pacific Ocean in April-May, 1974. The results showed that PCB concentrations in Euphausia pacifica, Calanus plumchrus, C. cristatus, and Aglantha digitale were 0.07-0.08, 0.19, 0.10-0.11, and 0.02ppm, respectively. Levels of PCB in Euphausia and Copepoda were higher than those in salmon and trout feeding upon these zooplanktons in the same locations.