Seasonal dynamics of fish assemblage in a pond canal |
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Authors: | Ji?í Musil Zdenek Adámek Christian Baranyi |
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Institution: | (1) Department of Aquaculture and Hydrobiology, University of South Bohemia in České Budějovice, Research Institute of Fish Culture and Hydrobiology Vodňany, Zátiší 728/II, 389 25 Vodnany, Czech Republic;(2) Department of Fish Ecology, Institute of Vertebrate Biology AS CR, Květná 8, 60365 Brno, Czech Republic;(3) Department of Microbial Ecology, Vienna Ecology Center, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria |
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Abstract: | The annual dynamics of fish assemblage in a pond-connecting canal of a South Moravian pond aquaculture facility was studied
to reveal potential assemblage effects on pond stocks and vice versa. The species richness of fish assemblage and seasonal
dynamics of its development were predominantly dependent upon the fish stock of the interconnected ponds (particularly due
to escapees during the period of pond harvesting), which contributed to a considerable increase of commercial fish species
occurrence. Using a seasonal parameter, the season proved to have a major impact on fish assemblage dynamics (r = −0.71, P < 0.001). Spring samples were dominated by commercial fishes of aquaculture origin (mainly Cyprinus carpio). Occurrence of several fish species originating from the wild (bleak, Alburnus alburnus, chub, Leuciscus cephalus and roach, Rutilus rutilus) was also reported.
The pond canal was found to be an important reservoir site of persistent survival and potential subsequent spreading of some
undesirable alien fishes such as topmouth gudgeon (Pseudorasbora parva) and gibel carp (Carrasius auratus). Moreover, more attention should be paid to the potential negative impacts of all fishes of aquaculture origin upon the
natural ecosystem and to the adverse effects due to the immigration of wild fish into aquaculture pond farming units. |
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Keywords: | Fish assemblage Pond canal Species richness Seasonal dynamics Alien species |
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