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Fish species diversity in tributaries of the Haná stream
Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan ; Koubková, B. ; Gelnar, M.
Fundamental ecological parameters of the fish assemblages in the Brodecký potok (BP) and Rostěnický potok (RP) were presented. In th BP, 18 fish species, in the RP 11 fish species and in the whole river system of the Haná 30 fish species were presented. Index of species diversity (H') in the BP ranged from 0.3358 to 1.7161, abundance was 14359-66818 exx.ha-1 and biomass was 51.6-576.6 kg.ha-1. Stone loach occurred in the localities, where predator species (Esox lucius, Sander lucioperca and Perca fluviatilis) absented, in dominance 3.72-94.06% and biomass 18.84-53.1 kg.ha-1. Index of fish species diversity in the RP ranged from 0.7496 to 1.7268 abundance was 4490-14578 exx.ha-1 and biomass was 72.1-961.1 kg.ha-1. Stone loach occurred only in the stream mouth of BP in the dominance 3.79% and biomass 3.9 kg.ha-1.
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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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Occurence of Gobio kesslerii Dybowski, 1862 in the River Morava
Merta, L. ; Lusk, Stanislav
Gobio kesslerii is among the rare species in the ichthyofauna of the Czech Republic. Until recently, this species has been only know to occur in the River Bečvy (a tributary to the Morava River). In the autumn of 2003, numerous G. kesslerii were ascertained in the River Morava between the mouth of the r. Bečva (r.km 210.7) up to the weir at Bolelouc (r.km 221.04).
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Fish fauna of artificial wetland within the Chomoutovské jezero nature reserve, PLA Litovelské Pomoraví
Horák, Václav ; Lusk, Stanislav ; Lusková, Věra ; Halačka, Karel ; Mendel, Jan
The Chomoutov wetland was inhabited naturaly during extreme flood in 1997. During the research period, 2001-2003, 15 fish species were found in total. Most numerous within the fish community were populations of the species Rutilus rutilus, Scardinius erythropthalmus, Carassius auratus and Perca fluviatilis.
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Diploid, triploid and tetraploid silver crucian carp Carassius auratus from the lower reach of Dyje River: the first results of reproductive characteristics and experimental hybridization
Flajšhans, Martin ; Lusková, Věra ; Vetešník, Lukáš ; Halačka, Karel ; Rodina, Marek ; Lusk, Stanislav ; Gela, David
Diploid, triploid and tetraploid males of silver crucian carp, Carassius auratus, produced live motile spermatozoa, capable of fertilization. Flow cytometry for the relative DNA content in male gametes revealed spermatozoa of diploid males to be haploid, those of triploid males to be aneuploid and those of tetraploid male to be aneuploid and/or diploid. Concentration of spermatozoa and the percentage of live spermatozoa showed a tendency to drop with increasing ploidy level and this effect was significant for the tetraploid male compared to those of lower ploidy levels.
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Biodiversity of fishes in the Czech Republic (5)
Contributions presented to the international symposium on the "Biodiversity of the ichthyofauna of the Czech Republic (V)" held in Brno on 4 November, 2003. The symposium was organised by the Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic and the Agency of Nature and landscape Protection of the Czech Republic.
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Distribution and diversity of fish fry in different habitats of the Slapy reservoir
Kratochvíl, M. ; Kubečka, Jan ; Matěna, Josef
The fish fry assemblages of the Slapy reservoir (Czech Republic) were studied in May and June 2002. The aim of this study was to estimate diversity and distribution of fish fry in three habitats – epipelagic (depth 0 – 4 m), bathypelagic (depth 10 – 16 m) and littoral areas. Percids were present both in epipelagic and bathypelagic areas, while cyprinids preferred living in upper layers of the water column. During the dusk, bathypelagic fish started migration towards surface layers, throughout the dawn they returned back to the deeper layers. The highest densities of fish fry were observed in epipelagic zone during nighttime. Perch was revealed as the dominant fry species in Slapy reservoir, pikeperch was also abundant in the open water. Both during day and night, perch was usually the most common species in all habitats, cyprinids were most abundant in the littoral zone in May, only.
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