Mosnitskyy V. Ecological state and measures for conservation of fish resources of small reservoirs of the Ukrainian West Polissia by the example of Khrinnyky reservoir

Object of study - ecological state of the fish fauna of the Khrinnyky reservoir. The purpose of the study – determine and characterize the species composition of the fish fauna of the Khrinnyky reservoir, to study the ecological features of the populations of the main commercial fish species, to determine the impact of commercial, amateur and illegal fishing on the state of stocks and living conditions of fish fauna in conditions of excessive eutrophication of ecosystem and develop a set of measures to stabilize the state of aquatic bioresources. Research methods: theoretical analysis; field and laboratory studies (ichthyological, ichthyoecological, hydrobiological, hydrochemical); mathematical-statistical analysis. Theoretical and practical results. The hydrological, hydrochemical and hydrobiological conditions of the ecosystem of the Khrinnyky reservoir are analysed and its key problem, which is expressed in irreversible eutrophication processes, is identified. The taxonomic representation of the fish fauna was established, and the dynamics of the ecological structure of the ichthyocenosis in the context of faunal complexes, ecological groups at the place of residence, and the characteristics of reproduction and nutrition were traced. The influence of local anthropogenic factors on the fish fauna of the ecosystem is studied. A number of environmental measures are proposed to ensure the restoration of the fish fauna and the conservation of its biodiversity, the provision of the status of nature protection territories to individual sections of the water area. Novelty. The species composition of Khrinnyky reservoir fish fauna is defined. It contains 29 species from 28 genus and 9 families; its ecological and biological structure is analyzed; population of dominant species is examined and dynamic pattern is studied; the significance of direct local anthropogenic effect on fish fauna is confirmed. The degree of introduction. The proposed measures for the conservation of biodiversity of fish fauna were implemented in the development of measures for the protection of fish resources in 2010-2018 by the territorial bodies of the State Agency for Fisheries of Ukraine. As part of the grant initiatives of the Global Environment Facility (GEF), herbivorous freshwater fish species of the family Cyprinidae were introduced to stabilize production and destruction processes and improve the quality of water in the Khrinnyky reservoir. The area of use: in the activities of the State Fisheries Agency of Ukraine, the State Ecological Inspection of Ukraine and their territorial units.