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Concentrations of radiocesium (Cs and Cs) were measured in zooplankton in the waters of Miyagi, Fukushima, and Ibaraki Prefectures from May 2012 to January 2013. They varied from 0.1 to 9.1 Bq/kg-wet, and from 0.1 to 12.8 Bq/kg-wet for Cs and Cs, respectively. The zooplankton-to-water concentration ratio (CR) of Cs was calculated to be 20-1410 L/kg. Export fluxes of Cs by zooplankton were estimated to be 13-165 mBq/m/y. The contribution of zooplankton for the downward transport of Cs was at most 18 % of the previously reported export fluxes of Cs by sinking particles as obtained from sediment trap observations. [ABSTRACT FROM AUTHOR]