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Computer simulations were employed to determine the ef­ ficiency of selected sampling methods used to determine the age composition of the catches. Both proportional (PROP) and stratified sampling schemes were analyzed. In the stratified sampling, the efficiency of drawing a constant number of fish from the stratum (S _ CON) as well as drawing a number of fish proportional to the product of the fish numbers and the stan­ dard deviation of age in the stratum (S_PROP*SD) were in­ vestigated. The S _PROP*SD sampling method was proven to be the most effective. The proportional sampling was shown to be the best when taking into consideration the sampling effi­ ciency and the practical possibilities of implementation of a given drawing scheme.

The comparison of selected sampling methods for determining the age distribution of fish in the catches