The objective of the present paper was to determine the variability of metric and meristic characters of the sample of flounder captured in the Pomeranian Bay. Moreover, the material studied allowed to describe a length distribution, age structure, growth rate of length and weight as well as the length-weight relationship. The population examined showed a high plasticity of metric characters testified by high coefficients of variability. It was stated that he relationship between the longer radius of otolith and total length of fish examined was curve-linear, therefore the growth rate of length by means of back- calculations was estimated followed the Vovk’s method. The growth rate of length and weight in the flounder studied from the Pomeranian Bay was calculated employing the v. Bertalanffy’s and modified v. Bertalanffy’s equations, respectively. In the case of 14 metric characters statistically significant differences between sexes were found used the non- parametric test of Kolmogorov- Smirnov. In meristic characters no statistically significant differences between sexes were noted.

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