Elements of circular technologies in aquaculture on the waters of energy facilities Marina Kalaida, Madina Khamitova, Andrey Kalaida, Svetlana Borisova and Valeria Babikova E3S Web Conf., 288 (2021) 01048 Published online: 14 July 2021 DOI: 10.1051/e3sconf/202128801048