The quality, quantity characteristics, biodiversity and changes bottom bioc
enoses of the Volgan region Caspian Sea are described, The antropogenic inf
luence generate biocenosis structure, Macrofauna of the area of investigati
on includes 83 taxa of benthic invertebrates. Complete list of recorded spe
cies is given. The main role in benthic communities belongs to autochtone t
axa caspian (ponto-caspian) of the freshwater origins.