<abstract xmlns="http://www.w3.org/1999/xhtml">The study summarises results of the ichthyologic research of the Podolský and Stříbrný brooks in Hrubý Jeseník. The research was organised for the purpose of finding the actual situation in the fish settlements in the sections of interest and to make suggestions for their further management benefiting the original fish communities.The results have shown that there is the community of water organisms with naturally reproducing <italic>Cottus poecilopus</italic> and <italic>Salmo trutta</italic> in both partly adjusted water flows which have not been restocked by man since 1996.The facts found within the research suggest that the biologically correct way for the further development of fish populations in the Podolský and Stříbrný brooks may be the maintenance of the existing natural conditions while no local adjustments of the flow beds along roads should be excluded.The research results have proved that the existing natural conditions and the very limited anthropogenic pressure put on the water biocenoses have been the decisive factors during the formation of the now existing fish population structures which can be assessed as good from the ecological point of view. Because of that we have recommended to the manager of the water flows neither interfering in the development of the current fish populations nor restocking any fishes.We consider the finding that the age structure and the high numbers of <italic>Salmo trutta</italic> and <italic>Cottus poecilopus</italic> have been, in the given situations, the indicators of their populations’ ability, even at the sympatric presence of <italic>Lutra lutra</italic> and <italic>Ciconia nigra</italic>, resistant against the predators’ pressure, as very important.</abstract>

The study summarises results of the ichthyologic research of the Podolský and Stříbrný brooks in Hrubý Jeseník. The research was organised for the purpose of finding the actual situation in the fish settlements in the sections of interest and to make suggestions for their further management benefiting the original fish communities.The results have shown that there is the community of water organisms with naturally reproducing Cottus poecilopus and Salmo trutta in both partly adjusted water flows which have not been restocked by man since 1996.The facts found within the research suggest that the biologically correct way for the further development of fish populations in the Podolský and Stříbrný brooks may be the maintenance of the existing natural conditions while no local adjustments of the flow beds along roads should be excluded.The research results have proved that the existing natural conditions and the very limited anthropogenic pressure put on the water biocenoses have been the decisive factors during the formation of the now existing fish population structures which can be assessed as good from the ecological point of view. Because of that we have recommended to the manager of the water flows neither interfering in the development of the current fish populations nor restocking any fishes.We consider the finding that the age structure and the high numbers of Salmo trutta and Cottus poecilopus have been, in the given situations, the indicators of their populations’ ability, even at the sympatric presence of Lutra lutra and Ciconia nigra, resistant against the predators’ pressure, as very important.

Ichthyocenosis of the Podolský Brook spring section in the Hrubý Jeseník mountains (Upper River Odra basin) within the context of the presence of fish predators

Lesy České republiky s.p., Správa toků - oblast povodí Odry, Frýdek-Místek, Pracoviště Krnov, V Osadě 22, CZ

Acta Musei Silesiae, Scientiae Naturales

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The study summarises results of the ichthyologic research of the Podolský and Stříbrný brooks in Hrubý Jeseník. The research was organised for the purpose of...

Ichthyocenosis of the Podolský Brook spring section in the Hrubý Jeseník mountains (Upper River Odra basin) within the context of the presence of fish predators

Published Online: Dec 01, 2019

Page range: 179 - 187

DOI: https://doi.org/10.2478/cszma-2019-0018

Keywords
Ichthyocenosis, Hrubý Jeseník Mountains, predation, natural coexistence

© 2019 Bohumír Lojkásek et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Ichthyocenosis of the Podolský Brook spring section in the Hrubý Jeseník mountains (Upper River Odra basin) within the context of the presence of fish predators

Published Online: Dec 01, 2019

Page range: 179 - 187

DOI: https://doi.org/10.2478/cszma-2019-0018

KeywordsIchthyocenosis, Hrubý Jeseník Mountains, predation, natural coexistence

© 2019 Bohumír Lojkásek et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Ichthyocenosis, Hrubý Jeseník Mountains, predation, natural coexistence