Abstract
Data from two projects carried out within the extensive (180 km2) reed belt of Lake Neusiedl, Austria – one about the fish community and the other about the colonial breeding piscivorous birds, great white egret, Casmerodius albus L., purple heron, Ardea purpurea L., grey heron, Ardea cinerea L., and spoonbill, Platalea leucorodia L. – were used to assess the impact of fish-eating birds on the fish population. Piscivorous birds ate about 12% of total fish standing stock within the reed belt. Their food intake was estimated to account for 21% of fish production within a size range of 3–25 cm total length (potential prey size). Competition between fish-eating birds and commercial fisheries was considered to be negligible.
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