Anthropogene Langzeiteffekte auf die Felchenpopulation des Bodensees

This thesis deals with anthropogenic effects on the whitefish stock of Lake Constance in the time period 1950-2000. Eutrophication, size selective-fishery as well as stocking affects different whitefish traits such as somatic growth, reproductive investment as well as vertical distribution. Most of the analysis are based on fisheries data documented during the last 50 years.This thesis shows that beside lake trophy, the practice of fishery itself could be a factor for ongoing growth depletion. Strong fluctuations in fish biomass acts strongly on growth rate as well