Аннотация:Журнал: в РИНЦ, в списке ВАК.А.П.Садчиков, С.А.Остроумов. Водоросли и цианобактерии как факторы формирования фонда растворенных органических веществ и качества воды в водоеме при отмирании клеток // Рыбное хозяйство. 2020.****ALGAE AND CYANOBACTERIA AS FACTORS OF FORMATION OF POOL OF DISSOLVED ORGANIC SUBSTANCES AND WATER QUALITY IN WATER BODY DURING CELL DECAYA.P. Sadchikov *, S.A. Ostroumov **International Biotechnological Center of Lomonosov Moscow State University, Doctor of Biological Sciences, Professor (Russia) *Lomonosov Moscow State University, Doctor of Biological Sciences, Leading Researcher of the Laboratory of Physical and Chemistry of Biomembranes (Russia) ** ABSTRACT. Using the radioisotope method, new quantitative characteristics of the role of phytoplankton in the formation of the pool of dissolved organic matter (DOM) in a freshwater ecosystem have been obtained. The destruction of dead phytoplankton took place within one week. In natural water bodies, detritus settles at a rate of about one meter per day. In deep water bodies, most of DOM is released from dead cells of phytoplankton into the oxygen-rich water column, where it is destroyed by bacterioplankton. In shallow water bodies (in particular, fish ponds), detritus particles do not have time to decompose in the water column. Their further destruction is carried out at the bottom of the water body with oxygen deficiency, which may lead to a decrease in water quality.Keywords: bacterioplankton, cyanobacteria, algae, dissolved organic matter, DOM, cell death, heterotrophic activity, destruction processes, mineralization of organic matter, radioisotope method.**07.10.2020.