Сезонное распределение сельдей южной Балтики и факторы среды

Abstract

Based on biological and hydrological data from 1975, 1979-1982, the seasonal distribution patterns of juvenile and adult herring in the southern Baltic Sea have been identified in relation to environmental factors. During the wintering period, the distribution of herring is mainly determined by the depth of the oxygen-deficient zone and the temperature of the bottom water layer along the coastal slope. During the pre-spawning period, the distribution of herring aggregations is closely linked to the condition of the individuals' reproductive organs. During the feeding period, the main factor determining the distribution of herring is the distribution and composition of its food base. At this time, juvenile and adult herring are maximally separated, which is due to the nature of their feeding habits and the specific composition of zooplankton in shallow coastal and deep-sea areas.