State of plankton community was monitored in the Pacific waters at Kuril Islands in July-August 2016, in conditions of mass feeding migrations of subtropical fish. Structure of the plankton community corresponded to its summer season: the large-sized fraction of zooplankton prevailed by biomass (74-86 %), the portions of medium- and small-sized fractions were 3-13 % and 11-15 %, respectively. The dominant groups in the large-sized fraction were copepods ( Neocalanus plumchrus, Metridia okhotensis, Metridia pacifica, Eucalanus bungii ), arrowworms ( Sagitta elegans ) and hyperiids ( Themisto pacifica ). Copepoda nauplii and copepodites of I-II stage, Euphausiacea furcilia and caliphyptophytes, and juvenile hyperiids were found in the small-sized and medium-sized fractions. Total biomass of the large-sized fraction was significantly higher in summer 2016 than in July-August 2015, obviously because of earlier phase of seasonal succession under colder thermal regime. In 2016, the biomasses of copepods and sagittas were at the mean long-term levels, and the biomass of euphausiids was above the norm. The biomasses of the small- and medium-sized fractions were above the norm, too. The total stock of plankton in the surveyed area in July-August 2016 was assessed in 92926. 103 t. High biomass of zooplankton in this area was favorable for feeding of subtropical fish.