<p>Marked and capture-recapture methods are the main alternative to the methods of absolute count for determination of the populations size within the limits of biotope. Principal advantage of these methods is the absence of dependence between the calculation error of population size and biotope area. The basic lack of the methods is the results' dependence on a sample size.</p> <p>This article aims to fill the existent gaps in national ecological literature concerning the usage of these

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... and to present the algorithms of determination of population size from the data of marked and capture–recapture methods.</p> <p>Key words: population, marked methods, capture-recapture methods, mathematical methods.</p>