The effect of lake morphometry on the effectiveness of vendace management

Abstract

Analyses were carried out of long-term data on vendace management in 114 lakes of total area 59.1 thousand ha and on morphometric characters of these lakes. Statistical methods were used to determine the relationships between lake morphometry and the effectiveness of fishery management. Four morphometric parameters were taken into consideration: lake area, average depth, maximal depth and development of the shore line. It was found that the effects of vendace management, expressed as vendace yield and effectiveness of stocking, were most strongly related to average lake depth. Multiple regression equation was obtained, which related vendace yields to stocking rates and average lake depth. The equation was used to construct a table helpful in undertaking management decisions as to the allocation of vendace stocking material.