Vertical distribution of zooplankton biomass in the Sea of Japan at Station VITYAZ7519

Differences between the series are significant for most species only near the surface, whereas in deeper layers character of distribution remains the same. Great depths in the Sea of Japan are populated most actively by species performing intensive daily migrations, and less actively by species continuously confined to a definite depth range.

Different character of nutrition of the animals apparently determines extent of utilization of deep layers, which are usual for the species.