Karelian Lakes Expert System:
3. Model Approach to Studying Fish Communities

V. V. Menshutkin^a, N. N. Filatov^b, S. P. Kitaev^c, and A. L. Chukharev^b

^a St. Petersburg Economics and Mathematics Institute, RAS, ul. Chaikovskogo 1, St. Petersburg, 191187 Russia

^b Northern Water Problems Institute, Karelian Research Center, RAS

^c Institute of Biology, Karelian Research Center, RAS, prosp. Aleksandra Nevskogo 50, Petrozavodsk, 185030 Russia

E-mail: nfilatov@nwpi.krc.karelia.ru

Received October 14, 2010

Abstract—The final work on the development of an expert system for the assessment of the state and the ratio-
nal use of lake’s resources is presented. A block of expert system for the assessment of ichthyocenoses is
described. For this purpose, databases and knowledge bases on 12 species of most abundant Karelian fishes
were used and a model of community, based on the principle of trophic chain, was proposed. The system was
developed for water bodies with different compositions of ichthyocenoses and different food and abiotic con-
ditions. The model makes it possible to assess the ichthyomasses and age structure of populations and to deter-
mine the rational ways to commercial use of the community for maximizing the catches with the preservation
of biodiversity.

Keywords: lake ecosystem, model, fish community, trophic network, ichthyomass, catches

DOI: 10.1134/S0097807812030049

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