Abstract
In this paper, we record the introduction or invasion of 41 non-indigenous fish species into natural ecosystems of the Czech Republic over the past two centuries. Of these, only 12 species have survived to the present day. Fully naturalised species that have established natural populations include Ameirus nebulosus, Carassius auratus gibelio, Gasterosteus aculeatus, Pseurorasbora parva, and Neogobius melanostomus. Oncorhynchus mykiss and Salvelinus fontinalis form occasional and locally stable populations. The occurrence of the remaining species (Coregonus maraena, Coregonus peled, Ctenopharyngodon idella, Aristichthys nobilis, and Hypophthalmichthys molitrix) is reliant upon aquaculture, including hand-stripping. The six-year annual average of total production of alien species in the Czech Republic for 2001–2006 reached 2054 tonnes. Of these alien species, only C. auratus gibelio has been shown to have a significantly negative impact upon native ichthyofauna. At present, apart from Mylopharyngodon piceus, no further officially sanctioned imports of alien species are under consideration.
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Lusk, S., Lusková, V. & Hanel, L. The list of alien species in the ichthyofauna of the Czech Republic. Russ J Biol Invasions 1, 172–175 (2010). https://doi.org/10.1134/S2075111710030057
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DOI: https://doi.org/10.1134/S2075111710030057