Subjects of research: Amasay Lake System (ALS) on the middle reach of river Syrdarya, Mejdurechye Wwater Rreservoir (MWR) on the lower reach of Amudarya River, phytoplankton, fishes.
Purpose of work: development of comparative evaluation of hydro ecological condition and fisheries potential in the large polytypic water bodies on the base of detailed investigations of hydrophysical, hydrochemical, hydrobiological, ecotoxicological and fisheries indicators using ecosystem approach, as well as creation of the computerized database with main fisheries ecosystems indicators.
Methods of research: hydrobiological, hydrochemical, ecotoxicological, icthyological, hydrobiological, geoinformation methods of research.
The results obtained and their novelty: conducted detailed researches using ecosystem approach some particularities of dynamics of a hydrochemical regime and hydrochemical processes were established for the first time. Features of qualitative, quantitative and bioproduction parameters changes of hydrobionts under influence of natural and anthropogenous changes of environmental conditions of hydroecosystems of ALS and MWR were revealed. The bioecological and toxicological characteristics of modem commercial fish fauna is given and the conditions negatively influencing existence and fate of fish populations are clarified. On the basis of the obtained actual results significant improvement of ecotoxicological situation in investigated hydroecosystems is discovered. For the first time the ecohydrologycal data base, with application of program ArcView GIS_3.2 on the basis of own and literature data is developed, which provides possibility to evaluate modem ecosystem conditions.
Practical value: the received results of researches can be used for drawing up -conclusions about the condition of bioresources and ecosystems as a whole with the purpose of acceptance of optimum decisions in regulation and optimization of sustainable use and increase in bioproductivity.
Degree of embed and economic cffectivity: developed «Ecohydrologycal data Base » is given to the State biological control Agency at The state Committee on Nature Protection, Center of fish culture development at the Ministry of agriculture and water resources, and biology-soil science faculty of National University of Uzbekistan for practical application.
Field of application: wildlife management, fisheries, the higher and special educational institutions.
