Seasonal dynamics of the Acartia tumida Willey, 1920 (Copepoda: Calanoida) population in nearshore waters of Kievka Bay, Sea of Japan

In 2002, the neritic copepod Acartia tumida was present in the plankton of Kievka Bay from February through July at a temperature of -1.2 to 14 degree C with an average population density of 6812 ind/m super(3) and a biomass of 532.75 mg/m super(3) (0.12-65.33 and 2.2-87.84% of total copepod density and biomass, respectively). The maximum population density of A. tumida (45 600 ind/m super(3)) was recorded in the first ten-day period of April at a temperature of 2.2-3.8 degree C. Seasonal variations in the age and sex structure of A. tumida population were found. From February to July, A. tumida produced two generations.