Hydrobiological and trophological researches in the Caspian Sea
The authors describe new ecological conditions in the Caspian region: stabilization of the sea water level, desalination of the northern Caspian area, biological pollution of the sea ecosystem influencing all trophic links. Last years results confirm the satisfactory feeding conditions of fish and invertebrates. Small forage algae dominate phytoplankton. Zooplankton of the northern Caspian Sea is characterized by increase of qualitative diversity and quantitative indices of organisms development. Valuable forage species (Acartia) appeared in the southern and middle Caspian Sea, while soft benthos organisms dominated the bottom fauna.