1. Diatom Algae of Waterbodies in the Subarctic Tundra

   • L. I. Kopyrina
   • S. I. Genkal
   • P. A. Remigailo

   AQUATIC FLORA AND FAUNA 26 April 2021 Pages: 125 - 132

   

2. New Finds and Species of Caddisflies (Trichoptera) in Southeastern Belarus

   • A. M. Ostrovsky

   AQUATIC FLORA AND FAUNA 26 April 2021 Pages: 133 - 140

3. Relative Mass of Pharyngeal Teeth of Roach Rutilus rutilus: Correlation with Fish Biologic Parameters and Inherited Traits

   • N. I. Komova

   BIOLOGY, MORPHOLOGY, AND SYSTEMATICS OF HYDROBIONTS 26 April 2021 Pages: 141 - 149

   

4. Morphofunctional Status of the Mongolian Grayling Thymallus brevirostris in a Mountain Lake in the South of Eastern Siberia

   • I. S. Nekrasov
   • L. A. Shuman
   • A. G. Selyukov

   BIOLOGY, MORPHOLOGY, AND SYSTEMATICS OF HYDROBIONTS 26 April 2021 Pages: 150 - 158

   

5. Analysis of the State of Biological Communities in a Continental Water Body using Hydrooptical Characteristics

   • G. V. Vinokurova
   • I. A. Sutorikhin
   • I. M. Frolenkov

   PHYTOPLANKTON, PHYTOBENTHOS, PHYTOPERYPHYTON 26 April 2021 Pages: 159 - 167

   

6. Modern Trophic State of the Benthic Zone in the Ivankovo and Uglich Reservoirs According to the Content of Sedimentary Pigments

   • L. E. Sigareva
   • N. A. Timofeeva
   • R. A. Lozhkina

   PHYTOPLANKTON, PHYTOBENTHOS, PHYTOPERYPHYTON 26 April 2021 Pages: 168 - 176

   

7. Flowering of Lemnaceae S.F. Gray in Siberia: Bioecological Characteristics

   • O. A. Kapitonova
   • S. A. Nikolaenko

   HIGHER AQUATIC VEGETATION 26 April 2021 Pages: 177 - 187

   

8. The Size-Age Structure and Growth of Whitefish (Coregonidae) in Arctic Lake Ioni, Eastern Chukotka

   • A. V. Shestakov

   ICHTHYOLOGY 26 April 2021 Pages: 188 - 195

   

9. Comparative Analysis of Fish Distribution in Lentic and Lotic Ecosystems (Review)

   • A. D. Mochek
   • D. S. Pavlov

   ICHTHYOLOGY 26 April 2021 Pages: 196 - 204

   

10. Genetic Screening of Distribution Pattern of Roaches Rutilus rutilus and R. lacustris (Cyprinidae) in Broad Range of Secondary Contact (Volga Basin)

    • O. N. Artaev
    • O. A. Ermakov
    • B. A. Levin

    ICHTHYOLOGY 26 April 2021 Pages: 205 - 214

    

11. New Data on Brown Meagre Sciaena umbra (Sciaenidae) at the Crimean Shore of the Black Sea Based on Visual Underwater Observations Using Breath-Hold Diving

    • I. Yu. Tamoykin
    • O. N. Kuleshova
    • V. S. Kuleshov

    ICHTHYOLOGY 26 April 2021 Pages: 215 - 221

    

12. Physiological Mechanism of Dinoflagellate Survival under a Biogenic Limitation

    • L. V. Stelmakh
    • I. M. Mansurova

    ECOLOGICAL PHYSIOLOGY AND BIOCHEMISTRY OF HYDROBIONTS 26 April 2021 Pages: 222 - 230

    

13. Effect of Phenol on the Activity and Temperature Characteristics of Peptidases in Chironomid Larvae at Different рН Values

    • V. V. Kuz’mina
    • E. Yu. Chornaya
    • V. A. Sheptitskiy

    ECOLOGICAL PHYSIOLOGY AND BIOCHEMISTRY OF HYDROBIONTS 26 April 2021 Pages: 231 - 238

    

14. Erratum to: Novel Species of Centrohelid Heliozoans (Centroplasthelida) for Freshwaters of Central and Southern Vietnam

    • D. G. Zagumyonnyi
    • E. S. Gusev
    • A. P. Mylnikov

    Erratum 26 April 2021 Pages: 239 - 239