The current state of the zooplankton in the Kakhovka reservoir

N. Ya. Rudyk-Leuska, M. I. Khyzhnyak, A. A. Makarenko, M. V. Leuskyi

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National University of Life and Environmental Sciences of Ukraine,
15 Heroyiv Oborony str., Kyiv, 03041, Ukraine

The current state of the quantitative and qualitative development of zooplankton in the Kakhovka Reservoir is examined. The species composition, the representation of taxonomic groups, the number and biomass of zooplankton in the summer period of 2020–2021 were determined. The average number of zooplankton in the summer of 2020 in the studied areas (Bilenke village, Bilenke-Malokaterynivka station, vicinity of Malokaterynivka village) was 40.833 units/m³ with the biomass 0.245 g/m³, in the summer of 2021 — 110,932 units/m³ with the biomass 0.652 g/m³. Rotifers formed the basis of the number and biomass of zooplankton in the summer of 2020 (76% and 86%). Cladocera both in number and biomass (5% and 7%) and copepod (18% and 6%, respectively) had a significantly lower level of development in the reservoir. Dreissena polymorpha larvae were found in a small amount (1%) and biomass (0.1%). In the summer period of 2021, rotifers also formed the basis of the number and biomass of zooplankton (72% and 68%). Cladocera both in number (8%) and biomass (14%), and the copepod (19% and 18%, respectively) reached a lower level of development in the reservoir. As in the previous year, the larva of D. polymorpha was found in a small amount (1%) and biomass (0.1%). In the summer of 2020, the basis of the number and biomass of rotifers was formed by: Asplanchna brightwelli (24% and 40%), Asplanchna priodonta (7% and 24%), Synchaeta pectinata (13% and 8%), Brachionus calyciflorus (6% and 6%), Euchlanis dilatata (6% and 2%, respectively), in the summer of 2021 A. brightwelli (16% and 27%), A. priodonta (5% and 19%), S. pectinata (12% and 8%), E. dilatata (7% and 2%), B. calyciflorus (6% and 6%), Brachionus diversicornis (5% and 2%, respectively). Chydorus sphaericus dominated in number (4%) and biomass (7%) among Cladocera in 2020, and C. sphaericus also dominated in number (7%) and biomass (12%) in 2021. In 2020, copepod in the reservoir are mainly represented by nauplial (17% and 6%) stages, and in 2021 by nauplial (12% and 4%) and copepod (4% and 3%) stages, as well as Diaptomus juv. (1% and 8%), Cyclops sp. (2% and 3%, respectively).

Key words: zooplankton, Kakhovka Reservoir, number, biomass

1. Arsan OM, Davydov OA, Dyachenko TM, Yevtushenko MY, Zhukinskiy VM. Methods of Hydroecological Research of Surface Waters. Ed. by VD Romanenko; Institute of Hydrobiology NAS of Ukraine. Kyiv, Logos. 2006: 408 p. (in Ukrainian)
2. Biliavtseva V. Methods of wastewater treatment with the help of aquatic organisms. Colloquium J. 2021; 17 (104): 54–63. DOI: 24412/2520-6990-2021-17104-54-63.
3. Buzevitch IY. Current state of commercial ichthyofauna of the Kakhovka reservoir. Sci. Ukr. 2008; 4: 4–9. Available at: https://fsu.ua/index.php/uk/2008/4-2008-6/2008-04-004-009 (in Ukrainian)
4. Denisova AI, Tymchenko VM, Nakhshina EP. Hydrology and Hydrochemistry of the Dnipro and Its Reservoirs. Ed. by MA Shevchenko; Institute of Hydrobiology, Academy of Sciences of the Ukrainian SSR. Kyiv, Naukova dumka, 1989: 216 p.
5. Dombrovskyi KO, Bychok SV. Zooplanktonic community structure of the river area of the Kakhovka reservoir littoral. Zaporizhzhya Nat. Univer. Biol. Sci. 2016; 1: 127–138. Available at: http://irbis-nbuv.gov.ua/cgi-bin/irbis_nbuv/cgiirbis_64.exe?C21COM=2&I21DBN=UJRN&P21DBN=UJRN&IMAGE_FILE_DOWNLOAD=1&Image_file_name=PDF/Vznu_bio_2016_1_18.pdf (in Ukrainian)
6. Dombrovskyi KO, Korzh OP. Hydrobiological features of the upper basins of the Kakhovka reservoir under conditions of anthropogenic pollution. Zaporizhzhya Nat. Univer. 2006; 1: 64–70. (in Ukrainian)
7. Fedonenko OV, Yesipova NB, Sharamok TS, Marenkov OM. Hydroecological condition of the Kakhovka reservoir. Bioind. Ecol. 2010; 15 (2): 214–222. DOI: 10.1111/j.1835-9310.1985.tb01406.x. (in Ukrainian)
8. Grishin B, Krazhan S, Chuzhma N. Assessment of the development of pond forage base when rearing carp (Cyprinus carpio carpio) fish seeds at fish farm “Merkuriy”. Sci. Ukr. 2015; 3: 34–45. DOI: 10.15407/fsu2015.03.034. (in Ukrainian)
9. Hryhorenko T, Mushyt S, Bazaieva A. Productivity of nursery ponds under the complex exposure to their ecosystem. Sci. Ukr. 2020; 3 (53): 19–32. DOI: 10.15407/fsu2020.03.019. (in Ukrainian)
10. Kutykova LA. Rotiferous fauna of the USSR. Moscow, Nauka Publ., 1970: 744 p.
11. Kutykova LA, Starobogatova YM. Determinants of freshwater invertebrates in the European part of the USSR. Leningrad, Nauka, 1977: 477 p.
12. Lytvynenko HH. Fodder base for juvenile fish and planktophagous fish of the Kakhovka Reservoir. Fisheries. Kyiv. 1977; 25: 59–63.
13. Malyarevskaya AY (ed.), Gurvich VV, Gusinskaya SL, Koreliakova IL, Kostikova LE, Kuzmenko MI, Mikhaylenko LE, Nebrat AA, Serheev AI, Skoryk LV, Sukhoyvan PH, Chernohorenko MI, Sherstyuk VV, Boshko EH, Voronchuk LV, Horbik VP, Emelyanova LV, Zubenko EB, Kovalchuk AA, Kurandina DP, Severenchuk NS, Titar VI, Shcherbak V. Plankton and benthos of the Dnipro reservoirs as a fodder supplies of fish. Kyiv, 1986: 216 p.
14. Manuilova EF. Branched crustaceans (Cladocera) fauna of the USSR. Moscow, Leningrad, Nauka, 1964: 328 p.
15. Monchenko VI. Jaw-mouthed cyclo-like, cyclops (Cyclopidae). Kyiv, Naukova dumka, 1974: 452 p. (in Ukrainian)
16. Mordukhai-Boltovskiy FD. Materials on the average weight of aquatic invertebrates of the Don basin. In: Tr. problems and topic. soviet 2. The problem of hydrobiology of inland waters. Moscow, Leningrad, Academy of Sciences USSR, 1954: 223–241.
17. Mordukhai-Boltovskiy FD, Rivier IK. Predatory branched Podonidae, Polyphemidae, Cercopagidae and Leptodoridae fauna of the world. Leningrad, Nauka, 1987: 182 p.
18. Pukalo PJ, Bozhyk LJ, Dumych OJ, Tonkonozhenko SM. Conditions for carp growing in feeding ponds of the Yaniv fishery. Mess. LNU Vet. Med. Biotechnol. Ser. Agricult. Sci. 2020; 22 (93): 35–39. DOI: 10.32718/nvlvet-a9306.
19. Samoilenko LM. Assessment of the current state of zooplankton in floodplain reservoirs of the Dnipro. reading, On the 90^th anniversary of the National Academy of Sciences of Ukraine. 2008; 4: 24–26.
20. Sirenko LA, Havrylenko MY. Algal Bloom and Eutrophication. Kyiv, Naukova dumka, 1978: 232 p.
21. Sygynevych GP. Estimation of sprat reserves and the level of zooplankton utilization by it in the Kakhovka Reservoir. J. 1968; 5: 46–54.
22. Vodyanitskiy VA (ed.), Braiko VD, Bechesku M, Vinogradov KA, Mordukhai-Boltovskiy FD. Identifier of the fauna of the Black and Azov seas. Vol. 1. Kyiv, Naukova dumka, 1968: 436 p. Available at: http://irbis-nbuv.gov.ua/cgi-bin/ua/elib.exe?Z21ID=&I21DBN=UKRLIB&P21DBN=UKRLIB&S21STN=1&S21REF=10&S21FMT=online_book&C21COM=S&S21CNR=20&S21P01=0&S21P02=0&S21P03=FF=&S21STR=ukr0005152
23. Vodyanitskiy VA (ed.), Braiko VD, Bechesku M, Vinogradov KA, Mordukhai-Boltovskiy FD. Identifier of the fauna of the Black and Azov seas. Vol. 2. Kyiv, Naukova dumka, 1968: 535 p. Available at: http://irbis-nbuv.gov.ua/cgi-bin/ua/elib.exe?Z21ID=&I21DBN=UKRLIB&P21DBN=UKRLIB&S21STN=1&S21REF=10&S21FMT=online_book&C21COM=S&S21CNR=20&S21P01=0&S21P02=0&S21P03=FF=&S21STR=ukr0005153