Abstract
A review of literature suggested that yield of Eurasian perch, Perca fluviatilis, in Lake Constance was greatest with moderate eutrophication. During eutrophication (1950–76), changes also took place in food, growth, distribution, and diseases of perch. Differences in perch between Lake Constance and other German or Alpine lakes of various degrees of eutrophy were found with respect to growth, yield, the relation of growth to yield, food, and the relation of food to growth. Similarities were apparent for perch in these lakes in terms of their age composition, age at maturity, and mortality. Only limited data were available for pikeperch, Stizostedion lucioperca, mainly on stocking success, yield, and growth. The status of percids in Lake Constance indicates that eutrophication has led to conditions favoring percids. Key words: Percidae, Lake Constance limnology, eutrophication, yield, Perca fluviatilis, food, growth, distribution, disease, Stizostedion lucioperca
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