| Summary: | The habitat of fish, its quantitative and qualitative indicators, has a direct or indirect effect on the health of fish, which, in turn, is the basis for obtaining high production indicators and other favorable biological markers used in aquaculture. Assessment of the hydrological and hydro-chemical regimes of water bodies, according to the main determined parameters, is an important factor in the forecast of mass dying phenomena in water bodies and watercourses of the country. A retrospective analysis of the hydrological regime of water bodies in Belarus, taking into account a number of hydrographic and hydro-ecological characteristics, over the previous 5 years, is generally assessed as favorable for the development of aquatic organisms. The hydro-chemical regime of reservoirs mainly determines the pre-dying and dying phenomena, therefore, it is assessed by a wide range of indicators, which include: oxygen (including BOD, COD – bichromate, permanganate, etc.), carbon dioxide, hydrogen sulfide, ammonia, nitrates and nitrites, phosphates, carbonates, ionic composition, iron, hardness, sodium, potassium, copper, manganese, zinc, chlorine, fluorine, etc. In 2018, the hydro-chemical status of water bodies was rated «excellent» for 62.5 % of objects in the Pripyat basin, 43.2 % of the Dnieper basin, 41.7 % of the Neman basin, 39.6 % of the Western Dvina basin and 5.9 % of the Western Bug basin. At the same time, with a favorable assessment of hydrological and hydro-chemical regimes of the country’s water bodies, deaths occur in them regularly and only in an insignificant part, the causes of death were confirmed by methods for determining the quantitative and qualitative indicators of aquatic organisms, other veterinary methods of invasive and non-invasive laboratory and hardware diagnostics. Среда обитания рыб, ее количественные и качественные показатели, оказывает прямое или опосредованное влияние на здоровье рыб, которое в свою очередь является основой для получения высоких производственных показателей и иных ...
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