Abstract
This study investigated changes in the structure of catches and growth rate of whitefish in the background regions of Lake Imandra (Babinskaya Imandra) in different periods of the lake’s transformation (1996–1997 and 2011). A reduction in the number of age groups with a reliable increase in the observed size-weight characteristics and back-calculation of fish lengths (TL) has been found. The increase of growth rate, in turn, has led to the naturally earlier achievement of optimal linear dimensions of the first spawning fish and to an earlier age of entry of males and females in the spawning population. No effect of whitefish puberty on the growth rate has been shown.
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