Abstract
To study the impact of cyprinids on algae, zooplankton and physical and chemical water quality, ten drainable ponds of 0.1 ha (depth 1.3 m) were each divided into two equal parts. One half of each pond was stocked with 0 + cyprinids (bream, carp and roach of 10–15 mm), the other was free of fish. The average biomass of the 0 + fish at draining of the ponds was 466 kg ha−1, to which carp contributed about 80%.
The fish and non-fish compartments showed significant differences. In the non-fish compartments the density of Daphnia hyalina was 10–30 ind. l−1 and that of Daphnia magna 2–4 ind. l-−1, whereas in the fish compartments densities were c. 1 ind. l−1. Cyclopoid copepods and Bosmina longirostris, however, showed higher densities in the fish compartments. The composition of algae in the two compartments differed only slightly, but the densities were lower in the non-fish compartments. The significant difference in turbidity was probably caused by resuspension of sediment by carp. No significant difference in nutrient concentration between the compartments was found.
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Meijer, M.L., Lammens, E.H.R.R., Raat, A.J.P. et al. Impact of cyprinids on zooplankton and algae in ten drainable ponds. Hydrobiologia 191, 275–284 (1990). https://doi.org/10.1007/BF00026063
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DOI: https://doi.org/10.1007/BF00026063