The results of algological researches of the Murmansk Marine Biological Institute for the period from 2015 till 2019 are presented with the following achievements. Analysis of the expeditionary samples revealed 79 species of algae macrophyte, rarely found at the Murman coast, among them 10 species were Chlorophyta, 33 –Phaeophyceae, 36 –Rhodophyta. A significant increase of the occurrence (presence) of Ulva lactuca L.at the Murmansk coast of the Barents Sea in 2009–2019 was noted, due to positive climatic anomalies caused by an increase of the influx of the Atlantic waters. It has been shown for the first time that the various morphological forms of the brown alga Fucus distichuslived on the littoral of the Murmansk coast of the Barents Sea are genetically homogeneous. The morphology of embryogenesis, early ontogenesis of F. distichusis described. It was determined that hydrostatic pressure (from 4 atm) negatively affects the development of spores of Alaria esculentaand Palmaria palmata, and can determine the lower boundary of algae growth. It was shown that a change in the activity of enzymes of the
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