Versuch einer Begründung für den Wandel in der qualitativen und quantitativen Zusammensetzung des Fischbestandes im Bodensee während der letzten 60 Jahre und eine Bewertung der Besatzmassnahmen

Statistics for all important fish for the past 60 years and the management measures taken, together with the scientific results, have been evaluated, in order to recognize the development trend and the success or failure of the measures. Although total yields have increased by 500%, the catches for some species i.e. pike, pike-perch and lake trout, have decreased in the past 15 years in spite of enormous measures. The possible reasons are discussed. Cannibalism and decimation through rapacious fish regulate the yield and cause oscillations. Therefore studies on the biology of fish must rather consider the correlations between the single species. For good management, it is more important to plant alevins than fry.

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Meinem Mitarbeiter Heinz Quoss danke ich recht herzlich für die Zusammenstellung der einzelnen statistischen Werte und für die zahlreichen Berechnungen.