Regularities of vendace management and methodical aspects of its assessment on a long-term basis

Abstract

Analyses were performed of the records pertaining to vendace management in 60 lakes of total area 29.8 thousand ha and the period of 42 years. The lakes were arranged according to decreasing effectiveness of this management, and then divided into 3 groups characterised by different intensity of vendace management, viz. high, moderate and low. Trends of stockings and catches as well as the effectiveness of stocking with vendace were determined for all lakes and for the distinguished groups. Correlation was calculated between stocking with vendace and vendace landings. The most effective stocking rates have been determined, and possibilities of optimising vendace management have been discussed.