Comparative biological and morphometric studies were carried out on vendace from lakes Drawsko and Pełcz in two seasons of the year. The summer sample covered 106 specimens of this fish from Drawsko Lake and 120 specimens from Pełcz Lake, while the autumn sample consisted of 110 and 104 specimens, respectively. This survey demonstrated a number of significant differences in the individual weights, the condition of the fish, as well as in the mensural and meristic characters. Out of a total of 28 analysed linear parameters, such differences were recorded in 15 characters in summer and in as many as 19-in autumn. Also 3 out of 11 meristic parameters showed differences. Vendace of Pełcz Lake, among other things, had larger (related to fork length, FL) linear dimensions of individual body parts and they had smaller maximal body depth. The reasons behind the above-mentioned differences may be different environmental conditions of both lakes.
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