TY - JOUR N2 - The research analyzed seasonal changes of the oxygen regime and related indicators on the example of water objects of the Ukrainian Polesie Region. The region shows different directions of economic use. Zebrafish ( Danio rerio Hamilton–Buchanan) and the Prussian carp ( Carassius auratus gibelio Bloch) were used as test objects to investigate survival responses. Dissolved oxygen (DO) concentration in water, pH values and temperatures were determined by standard methods. Based on research results, the main problems were determined pertaining to the oxygen regime of investigated waters, i.e. the increase in temperature and toxicity of the aquatic environment in the summer. A rather dangerous decrease in DO concentration, almost up to the levels of maximum allowable concentration (MAC) (4.10 mg∙dm–3 in group E1 and 6.07 mg∙dm–3 in group E2), was observed in August and it was typical for the reservoirs with a slow water movement. Flowing river waters (group E3) were eliminated due to their better aeration compared to other groups. The correlation analysis based on the presented data revealed a high and average degree of probable correlation between the DO concentration and water temperature, as well as an average degree of correlation with general toxicity determined on sensitive species of D. rerio, and in group E1 on the persistent species C. auratus gibelio as well. The interrelations and equations of the rectilinear regression can be used to predict the oxygen regime of the waters investigated and other surface waters having similar problems. L1 - http://www.czasopisma.pan.pl/Content/119856/12%20Aristarkhova,%20Fedonyuk%20704.pdf L2 - http://www.czasopisma.pan.pl/Content/119856 PY - 2021 IS - No 49 EP - 110 DO - 10.24425/jwld.2021.137102 KW - correlation analysis KW - dissolved oxygen KW - fish KW - oxygen regime KW - рН KW - seasonal fluctuations KW - surface water KW - temperature KW - toxicity A1 - Aristarkhova, Ella O. A1 - Fedoniuk, Tetiana P. A1 - Romanchuk, Ludmila D. A1 - Latushynskyi, Sergii V. A1 - Kot, Iryna V. PB - Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute DA - 2021.06.09 T1 - Features of the surface water oxygen regime in the Ukrainian Polesie Region SP - 104 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/119856 T2 - Journal of Water and Land Development ER -