Abstract
The feeding activity of adult roach (Rutilus rutilus), perch (Perca fluviatilis) and ruffe (Gymnocephalus cernuus) was studied over a one year cycle to show trophic relations between fish and the prey communities in eutrophic Lake Aydat.
Daily consumption rates were referred to the stock of the different age classes of fish. Seven food compartments (phytoplankton, macrophytes, Cladocera, Copepoda, macroinvertebrates, fish and sediment) were used by the fish. The main prey compartment ofR. rutilus were macroinvertebrates (39.7%), sediment (29.0%), macrophytes (15.4%) and phytoplankton (14.9%). Little zooplankton was consumed (2.4%).P. fluviatilis fed mainly on macroinvertebrates and fish fry (both 41.8%) and some zooplankton (15.0%). ForG. cernuus, macroinvertebrates dominated in the diet (97.4%). During spring, Bacillariophyceae and macroinvertebrates represented the principal preys. During summer, insect larvae, phytoplankton and macrophytes were the principal components of the diet. At the end of summer, macrofauna was scare and fish tended to move to the pelagic zone feeding on plankton. In autumn, the prey spectrum was large. During winter, sediment was the most important item consumed, together with some macroinvertebrates. The impact of this fish community through consumption is highest on macroinvertebrates (40.7%), flora (27.7%) and sediment (28.4%). The predation of these three fish on zooplankton was low (1% per day of the zooplankton biomass) and restricted to periods when the other items were scarce. Interspecific competition is not excluded for macroinvertebrates.
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Jamet, JL. Feeding activity of adult roach (Rutilus rutilus (L.)), perch (Perca fluviatilis L.) and ruffe (Gymnocephalus cernuus (L.)) in eutrophic Lake Aydat (France). Aquatic Science 56, 376–387 (1994). https://doi.org/10.1007/BF00877183
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DOI: https://doi.org/10.1007/BF00877183