Effectiveness of vendace stockings as affected by stocking frequencies

Abstract

Analyses were performed of long-term data on coregonid management in 114 lakes of total area 59.1 thousand ha. Long-term mean values were calculated of vendace landings (in kg/ha) and stockings with larvae (fish/ha), and the index of stocking frequency was determined. Basic parameters characterising vendace management in lakes stocked with different frequency were determined, and multiple correlation was used to determine the dependencies between mean vendace yields, mean stocking rates and stocking frequency. This relationship proved to be statistically highly significant. The obtained equation of multiple regression was used to work out a practical table which can be used to optimise allocation of the stocking material.