Production and food consumption of predatory fish in the Vistula River

Vital statistics for six predatory fish species occurring in the Vistula River were estimated. The mixed, six species population, in its predatory phase, had an average biomass of 0‐96 g/m2 and produced 043 g/ma. Less than 45% of annual production was exploited by man and eggs shed amounted to about 10% of the production. Annual consumption by the population amounted to about 3 ‐44 kcal or g/ma. Accuracy of all estimates is low.