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Alien fish species in the Odra basin on Moravien and Silesian
Lojkásek, B. ; Lusk, Stanislav ; Papoušek, Ivo
In the territory of Moravian and Silesian, the upper part of basin of the River Odra is found, where the riverine net is formed by smaller streams. The original ichthyofauna species structure is therefore, relative poor, representing 2 lamprey and 33 fish species, from which at present, 1 lamprey and 3 fish species are considered to be extinct. During the 19th and 20th centuries within human activities, 8 alien exotic species were introduced and 5 non-native species for this area were dislocated. All introduced and dislocated species are subject to fishery management. Regards to the fact that the species Carassius carassius and Pseudorasbora parva reproduce naturally, their relationships and influence are negative to the native species, they are assessed as invasive alien species.
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The Red List of lampreys and fishes in the Czech Republic - Version 2005
Lusk, Stanislav ; Hanel, L. ; Lusková, Věra ; Lojkásek, B. ; Hartvich, P.
The new Red List was compiled on the basis of data obtained in the course of five past years. Besides the overall evaluation for the Czech Republic, the data were separately evaluated for the North Sea, Baltic Sea, and Black Sea basins. The status and degree of danger imminent to the populations of the particular species were evaluated also separately for each of the 16 water regions. Compared to the 2000 evaluation, classification was changed for following species: Salmo salar (previously EW, now CE), Acipenser ruthenus (NE / CE), Sabanejewia balcanica (EX / CE), Zingel streber (EX / CE), Chondrostoma nasus (EN / VU), Lota lota (VU / NT), Rhodeus amarus (NT / EN), Leucaspius delineatus (NT / EN), Alburnoides bipunctatus (VU / EN), and Carassius carassius (VU / EN). The degree of jeopardy for Alburnoides bipunctatus, Vimba vimba, Rhodeus amarus, Carassius carassius, Misgurnus fossilis is basically different in different water regions, varying between Extinct and Near Threatened.
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Problems posed by the protection of lamprey and fish localities of European importance in the drainage areas of the Dyje, Morava, and Odra rivers
Lusk, Stanislav ; Lusková, Věra ; Lojkásek, B. ; Halačka, Karel
In consequence of the accepted legislation concerning the protection of lamprey and fish species of European importance, potential sites of community interest (pSCI) have been selected for such species. At present, the national list of the proposed pSCI is being examined by the European Commission. If approved upon, the pSCI will be proclaimed "special areas of conservation" within the NATURA 2000 system. Although such pSCI and their populations are protected by legislation, there occur risks that endanger, both directly and indirectly, the quality of the pSCI and the population of the particular species. The examples mentioned in the paper indicate that such risks include local emergency pollution, construction of weirs and small hydraulic power plants, extraction of sediments from streambeds, cruising vessels, and stream modification. Such risks are due to the inconsequence and reluctance in observing the legal protection measures by concrete authorities of nature conservation.
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Fishes in streams of the Beskydy Protected landscape region
Lusk, Stanislav ; Lusková, Věra ; Halačka, Karel ; Lojkásek, B.
The river network of the Beskydy PLR (1,620 km2 ) belongs to the hydrological systems of Baltic and Black seas. It mainly consists of minor streams of the orders I and II. The basic components of their fish stock include Salmo trutta m. fario and Cottus poecilopus.In lower part of bigger streams are also additional species (Thymallus thymallus, Leuciscus cephalus, Alburnoides bipunctatus, Gobio gobio, Cottus gobio, etc.).
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