ASSESSMENT OF THE STATE OF BOTTOM COMMUNITIES ON THE ARTIFICIAL REEF STRUCTURES IN THE AREA OF THE DROP-OFF THE DEPTHS OF THE NORTHERN AND MIDDLE СASPIAN SEA von A. A. Kurapov, G. M. Abdurakhmanov, V. B. Ushivcev, D. I. Ermakov, N. B. Vodovskii, G. A. Akhmedova, A. G. Gasangadzhieva

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