The use of pelagic habitat by cyprinids in a deep riverine impoundment: Rimov Reservoir; Czech Republic
2008
Vasek, M.,Akademie Ved, Ceske Budejovice (Czech Republic). Hydrobiologicky Ustav | Jarolim, O.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Prirodovedecka Fakulta | Cech, M.,Akademie Ved, Ceske Budejovice (Czech Republic). Hydrobiologicky Ustav | Kubecka, M.,Akademie Ved, Ceske Budejovice (Czech Republic). Hydrobiologicky Ustav | Peterka, J.,Akademie Ved, Ceske Budejovice (Czech Republic). Hydrobiologicky Ustav | Prchalova, M.,Akademie Ved, Ceske Budejovice (Czech Republic). Hydrobiologicky Ustav
In the deep and slightly eutrophic dam part of the Rimov Reservoir (Czech Republic), the fish use of open water habitat was studied by means of gillnetting, hydroacoustics and diet analyses during the period from April to October 2005. The day and night acoustic surveys revealed majority of pelagic fish present in the upper 5 m of the water column. The highest gillnet catches of planktivorous fish in epipelagic waters were obtained in May and August. The lowest fish catches were recorded in April and October, which resulted in significant positive correlation betweeen the gillnet catch per unit effort and water temperature. The majority of captured fish were adults of three cyprinid species: Rutilus rutilus, Alburnus alburnus and Abramis brama. In the early spring the food of the three species was diversified as follows: bream consumed primarily cyclopoid copepods, bleak fed on terrestrial insects, and gut content of pelagic roach consisted mainly of littoral food components, algae and detritus. In the late spring and summer however, the diets of all three cyprinids were predominated by large cladocerans.
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