1. Two New Species of Free-Living Nematodes (Nematodes, Monhysterida) from the Mouth of the Cấm River, Vietnam

   • V. G. Gagarin

   BIOLOGY, MORPHOLOGY, AND TAXONOMY OF AQUATIC ORGANISMS 26 February 2021 Pages: 1 - 9

   

2. Features of Behavioral Responses of the Mediterranean Mussel in Its Natural Habitat of the Black Sea

   • V. V. Trusevich
   • K. A. Kuz’min
   • E. V. Vyshkvarkova

   BIOLOGY, MORPHOLOGY, AND TAXONOMY OF AQUATIC ORGANISMS 26 February 2021 Pages: 10 - 19

   

3. Flora of Small Reservoirs of Northeastern European Russia

   • B. Yu. Teteryuk
   • E. V. Knyazeva
   • A. A. Panyukov

   AQUATIC FLORA AND FAUNA 26 February 2021 Pages: 20 - 31

   

4. Biogenic Elements and Their Significance in the Development of Phytoplankton in Reservoirs of the Upper Volga

   • N. M. Mineeva
   • I. E. Stepanova
   • I. V. Semadeni

   PHYTOPLANKTON, PHYTOBENTHOS, PHYTOPERYPHYTON 26 February 2021 Pages: 32 - 42

   

5. Changes in the Taxonomic Structure of the Turbellarian Community (Platyhelminthes, Turbellaria) due to the Transformation of Environmental Conditions

   • Ye. M. Korgina

   ZOOPLANKTON, ZOOBENTHOS, ZOOPERIPHYTON 26 February 2021 Pages: 43 - 48

   

6. Efficiency of Transfer of Essential Substances from Phytoplankton to Planktonic Crustaceans in Mesotrophic Conditions

   • I. Yu. Feniova
   • E. G. Sakharova
   • V. P. Semenchenko

   ZOOPLANKTON, ZOOBENTHOS, ZOOPERIPHYTON 26 February 2021 Pages: 49 - 59

   

7. Structural Features of Scales of Baikal Grayling Thymallus baicalensis under Conditions of an Altered Hydrological Regime

   • I. V. Zuev
   • P. Yu. Andrushchenko
   • T. A. Zotina

   ICHTHYOLOGY 26 February 2021 Pages: 60 - 66

   

8. Functional Effects of the Use of Anesthetics on Teleostean Fishes (Review)

   • A. A. Soldatov

   ECOLOGICAL PHYSIOLOGY AND BIOCHEMISTRY OF HYDROBIONTS 26 February 2021 Pages: 67 - 77

9. Ependymins: New Data on Participation in the Regulation of Physiological and Behavioral Responses in Teleosts (Review)

   • D. V. Garina

   ECOLOGICAL PHYSIOLOGY AND BIOCHEMISTRY OF HYDROBIONTS 26 February 2021 Pages: 78 - 86

10. Features of Changes in the Functional State of Sturgeon during Maturation in Closed Water-Supply Installations

    • E. N. Ponomareva
    • P. P. Geraskin
    • Yu. V. Fedorovykh

    ECOLOGICAL PHYSIOLOGY AND BIOCHEMISTRY OF HYDROBIONTS 26 February 2021 Pages: 87 - 93

    

11. Specific Features of Technogenic Pollutants Impact on Photosynthetic Activity of Unicellular Cyanobacteria

    • N. Yu. Grigoryeva
    • T. B. Zaytseva

    AQUATIC TOXICOLOGY 26 February 2021 Pages: 94 - 103

    

12. Growth Conditions of Water Caltrop Trapa natans on the Northern Border of its Habitat

    • E. V. Mikhaylova
    • A. Ye. Artyukhin
    • B. R. Kuluev

    SHORT COMMUNICATIONS 26 February 2021 Pages: 104 - 108

13. First Record of Thermocyclops taihokuensis (Crustacea, Copepoda) in the Oka River Basin

    • V. I. Lazareva

    SHORT COMMUNICATIONS 26 February 2021 Pages: 109 - 112

    

14. Interannual Changes in the Spring Zooplankton of the Pelagic Zone of Lake Sevan (Armenia) in the Course of Increasing Fish Biomass

    • A. V. Krylov
    • A. O. Hayrapetyan
    • B. K. Gabrielyan

    SHORT COMMUNICATIONS 26 February 2021 Pages: 113 - 116

15. Climbing Perch Anabas testudineus Feeding in the Darkness: Observation in Infrared Light

    • E. D. Pavlov
    • E. V. Ganzha
    • D. S. Pavlov

    SHORT COMMUNICATIONS 26 February 2021 Pages: 117 - 120

    

16. High Rate of Endoparasites (Helminth) Infection of Toad (Anurans) in the Dir Lower, Khyber Pakhtunkhwa, Pakistan

    • A. U. Khan
    • M. Attaullah
    • A. Baset

    SHORT COMMUNICATIONS 26 February 2021 Pages: 121 - 124