Abstract
About 20 ovaries of the whitefish ‘Blaufelchen’ (Coregonus lavaretus L.) of Lake Constance (Bodensee) were collected annually from 1964‐1991. Absolute and relative fecundity peaked in the early 1980s, lagging about 2 years behind the maximum of total‐P in the water (during the circulation period). Out of the biological time‐series of Lake Constance, whitefish fecundity is the only one known to follow the phosphorus curve, and this may be the first time‐series documented case of parallel trend reversal in the trophic state of a lake and fish biology. It is concluded that fish fecundity serves, at best, as an unspecific monitor of the overall well‐being of the fish.
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