| Hydrophysics. Hydrology | 5 |
| V.N. Malinin, S.M. Gordeeva. Caspian sea level as an indicator of large-scale moisture cycling in the ocean-atmosphere-land system | 5 |
| A.V. Tolstikov, N.E. Galakhina, R.E. Zdorovennov. Hydrophysical and hydrochemical studies in the Kem' river estuary in September 2019 | 21 |
| Hydrochemistry and sediments | 32 |
| G.T. Frumin, N.A. Malysheva. Water quality changes in Lake Pskovskoe (2000–2018) | 32 |
| A.V. Leonov, M.V. Zobkova. Bod kinetic parameter values from long-term experiments (with different integrated water samples from the central part of Lake Onego) | 40 |
| P.A. Lozovik , N.V. Kulik, N.A. Efremenko. Lithophile elements and heavy metals in Lake Onego: sources, concentrations and transformation | 62 |
| Z.I. Slukovskii, V.A. Dauvalter. Features of Pb, Sb, Cd accumulation in sediments of small lakes in the south of the Republic of Karelia | 75 |
| Hydrobiology and ichthyology | 95 |
| J.V. Krylova, E.A. Kurashov, A.G. Rusanov. Comparative analysis of the component composition of the low molecular weight metabolome of water smartweed (Persicaria amphibia (L.) Delarbre) from diverse habitats in Lake Ladoga | 95 |
| D.Yu. Karnaukhov, E.A. Kurashov. On nighttime vertical migrations of amphipods in Lake Ladoga | 115 |
| Research methods | 125 |
| Sh.R. Pozdnyakov, R.R. Shagidullin, S.A. Kondratyev, A.Yu. Bryukhanov, M.V. Shmakova, N.S. Oblomkova, A.T. Gorshkova, D.V. Ivanov, Yu.V. Gorbunova, O.N. Urbanova, N.V. Bortnikova. Inventory of the sources of external man-made load on Kuibyshevskoe storage reservoir | 125 |
| T.Yu. Vyruchalkina. Development of a digital elevation model of Kara-Bogaz-Gol Bay | 139 |
| Dates and anniversaries | 145 |
| Nikolai N. Filatov (on the 75th anniversary) | 145 |
