This study was conducted to monitor and assess the environmental status of the Otkaznensky Reservoir of the Stavropol Territory from 1978 to 2018 and is mainly based on the analysis of satellite remote sensing data using GIS technology, archives materials and information from open sources of information. Anthropogenic activity of the second half of the twentieth century for the North Caucasus, it was accompanied by significant regulation and changes in river flow, the creation of a powerful artificial hydrographic network, changes in trophic state and hydrochemical regime of water bodies. By the beginning of the 1970s, the hydrographic network was replenished with a water management complex consisting of main canals, for example, the Greater Stavropol and Tersko-Kumsky. The total length of all channels was 4000 km (for comparison, the length of the Kuma River is ~ 800 km, the Kalaus River is ~ 400 km). The volume of annual water transfer through canals reached 2500 mn m3, and up to 90 % is the water of the Kuban River. Data from satellite remote sensing made it possible to establish the features of the environmental status, including long-term and seasonal dynamics of the area and other morphometric characteristics of the plain reservoir for the entire period of operation. Analysis of publications on the topic of remote monitoring and assessment of the dynamics of the state of water bodies and hydrographic networks in general has shown the high efficiency and prospects of using remote sensing methods. They provide multiscale and multi-time study. Ecosystems of water bodies are perfectly manifested in satellite images, they are not hidden in any way, they are single-tier, they are well decrypted both in texture and in spectral characteristics.

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Aim. The aim of the study is to analyze and reveal the features of the temperature regime of the Novotroitsky water reservoir surface based on remote sensing data; to determine the influence of the temperature regime of the surface waters of Novotroitsky reservoir on the ecological state of the reservoir, as well as to determine the areas of the surface water zones of the Novotroitsky reservoir with optimal and unfavorable temperature conditions for fish. Methods. The temperature values of the earth's surface (water area) were calculated according to the generally accepted methodology. Its essence lies in the fact that the calculation of the earth's surface temperature is performed after radiometric calibration of the images and compensation of the effect of the optical density of the atmosphere taking into account the emissivity of various objects on the earth's surface. The calculations were performed separately for the 10 and 11 channels of images from the Landsat 8 satellite, and then averaged. Results. Were established the quantitative characteristics of the inhomogeneity of the temperature fields of the water surface of Novotroitsky reservoir during the summer period due to discharges of the heated waters of the Stavropol GRES power plant. The peculiarities of the spatial variability of the temperature fields of the Novotroitsky water reservoir surface in summer season were revealed. It is shown that the use of the Novotroitsky water reservoir as a reservoir-cooler is potentially accompanied by the development of eutrophication processes and creation of risks for drinking purposes, as well as cultural, household and fishery use. The table shows the data demonstrating the temperature condition of the Novotroitsky reservoir water surface. The figure shows the temperature fields of the surface of the Novotroitsky water reservoir. Conclusions. In summer period, half of the water area of the Novotroitsky water reservoir can be attributed to the zones of optimum temperatures for the juvenile pikeperch. Were revealed the periods when the reservoir becomes practically unsuitable for growth and development of juveniles of oxyphilic fish. Excessive rise of water temperature in summer was established in accordance with SanPiN (Sanitary Rules and Regulations) 2.1.5.980-00.2.1.5. Such an increase in temperature is observed in 13-16% of the whole water area.

Резюме. Цель. Проанализировать видовую структуру уловов промысловых рыб в водоемах Ставропольского края для двух периодов с 1986 г по настоящее время. Методы. Условно выделен первый период с 1986-2003 гг. и второй период с 2009-2017 гг. Данные по линейным и площадным характеристикам территориальных объектов получены при использовании снимков спутника Landsat 8. Результаты. В сфере рыбоводства Ставропольского края в 2017 году было произведено 10,8 тысяч тонн товарной рыбы, что составило примерно 70% от максимума производства в 1990 г. Доля производства карпа составила 58%, белый и пестрый толстолобики -34%, амур белый -5%, прочие карповые виды рыб -3%, форель и осетровые -1%. В 2017 году произведено 1415 тонн рыбопосадочного материала, что составило 19 млн. штук, а это в 4 раза меньше, чем в 1990 году. Значение рыболовства в обеспечении населения края рыбой не столь велико в сравнении с рыбоводством. В различные периоды последних тридцати лет общий годовой вылов в краевых государственных водоемах (водохранилищах) колебался от максимальных 1065 тонн (1990 г.) до минимальных 82 тонн (2016 г.). Среднегодовой вылов всех госводоемов для периода 1986-2003 гг. составлял 357 т, рыбопродуктивность составляла 32 кг, при колебаниях по одиннадцати водоемам от 2 до 113 кг/га. За последние 9 лет, начиная с 2009 г., среднегодовой улов всех госводоемов сократился и составлял 285 т. Заключение. Для периода 1986-2003 гг. средний ежегодный вылов сазана (карпа) и серебряного карася составлял по 94 т, толстолобиков -79 т, на суммарную долю этих трех видов в выловах приходилось 85%. За последние 9 лет (2009-2017 гг.) суммарная доля этих рыб в уловах сократилась до 66%. Средний ежегодный вылов сазана (карпа) и толстолобиков сократился практически вдвое, тогда как вылов менее ценного серебряного карася вырос и достиг 103 т. Ключевые слова: биоресурсы, промысловые рыбы, рыбоводство, рыболовство, рыбохозяйственный комплекс.Формат цитирования: Мишвелов Е.Г., Бакуменко И.А. Видовая структура уловов промысловых рыб в водоемах Ставропольского края для периода конца XX -начала XXI веков // Юг России: экология, развитие.Abstract. Aim. The aim of the study is to analyze the species composition of commercial fish catches in water bodies of the Stavropol Territory for two periods from 1986 to the present. Methods. The first period from 1986 to 2003 is conventionally highlighted and the second period from 2009 to 2017. Data on linear and area characteristics of the territorial objects was obtained using Landsat 8 satellite imagery. Results. In 2017, in the fish industry of the Stavropol Territory, 10.8 thousand tons of marketable fish were produced, which was about 70% of the best production level in 1990. The share of common carp production was 58%, silver carp -34%, white Amur -5% , other carp fish species -3%, trout and sturgeon -1%. In 2017, 1415 tons of fish seeds were produced bringing the total to 19 million units, which is 4 times less than in 1990. The importance of fish catching in providing the population of the region with fish is not so...