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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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The influence of ploidy on the complete blood count in silver crucian carp
Vetešník, Lukáš ; Halačka, Karel ; Lusková, Věra ; Lusk, Stanislav
In the sample of 27 specimens of silver crucian carp (Carassius auratus) of different ploidy (5 diploids, 21 triploids and 1 tetraploid), the red component of complete blood count was found. Using the analysis of variance test, highly significantly lower erythrocyte count, insignificantly lower haemoglobin count and haematocrit value were proved. The mean corpuscular volume was increasing significantly with the ploidy increased, and mean corpuscular haemoglobin was increasing highly significantly with the ploidy increased.The tetraploid specimen indicated similar trend depending on the higher ploidy level.
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