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První nález Romanogobio vladykovi v povodí Nidy, Polsko
Nowak, M. ; Mendel, Jan ; Szczerbik, P. ; Koščo, J. ; Klaczak, A. ; Popek, W.
The Danube whitefin gudgeon Romanogobio vladykovi Fang, 1943 belongs to the R. albipinnatus (Lukasch, 1933) species group. In the territory of Poland so-called whitefin gudgeon was recorded for the first time in the middle stretches of Vistula River (1965). Since then the species has been found in some 20 localities in the Vistula and Odra River drainages. In May and July 2009 two specimens identified initially as belonging to the R. albipinnatus species group were caught in the main course of Nida River. Molecular approach based on combination of both mitochondrial and nuclear markers confirmed occurrence of R. vladykovi on Polish territory. This conclusion alters the knowledge about the distribution of the species of the R. albipinnatus species group. Kottelat and Freyhof (2007) considered that the territory of Poland is inhabited by R. belingi, whereas R. vladykovi is restricted only to the drainage area of Danube River.
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Molecular biodiversity inventory of the ichthyofauna of the Czech Republic - presentation of the started project
Mendel, Jan ; Halačka, Karel ; Vetešník, Lukáš ; Papoušek, Ivo ; Bartoňová, Eva ; Šanda, R. ; Koníčková, Milena ; Urbánková, Soňa
The study based on international cooperation would like to contribute in a significant way to identification and description of the species diversity of the complete Czech ichthyofauna using a comprehensive approach. The inventory and subsequent cataloguing concentrate on recent native and non-native species of fishes and lampreys living in natural waters of CR. The obtained results are used for inter-continental comparison of all fish species using the "DNA barcode" within the BoLD platform. The final summary evaluation will contribute to updating of the data for monitoring within the system Natura 2000 and will provide vital information and recommendations to the ANCLP CR. The new system of species collections of type specimens designed on the basis of a comprehensive approach and creation of a detailed voucher will mean significant contribution to the Czech museums.
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Trout (Salmo trutta) catches in some districts in the Morava River Basin
Halačka, Karel
The study deals with differences in catch of salmonids (particularly the brown trout) by angling in various waters in Morava river drainage. Significant differences were found in average number of caught fish per hour (2 - 23), average length (17,1 - 21 cm) and in proportion of fish reaching the minimum size in a given water (0 - 5,8 %). The minimum size seems to be to high in many cases. Lowering of the minimum size can be recommended in order to preserve population numbers.
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The fish ladder on the Dyje river at Bulhary: the first year of operation
Klíma, Ondřej ; Lusk, Stanislav ; Lusková, Věra
In the autumn of 2007 a fish ladder started operating on the river Dyje near Bulhary (river km 39.9). It is a near-natural fish ladder of the "bypass" type. The bypass is 210 m in length, its longitudinal slope is 1 : 56, there are 29 rock bars, the difference in water levels above and below a bar being 0.1 m, and the water discharge is round 2 m3.s-1. The function of the bypass was monitored throughout 2008. In all, 25 fish species were ascertained, indicating perfect permeability of the bypass. The occurrence of Leuciscus cephalus, Chondrostoma nasus, Barbus barbus and Alburnus alburnus in the bypass was connected with their marked spawning migrations. Some of the L. cephalus and B. barbus staed in the bypass for long periods, as indicated by the presence of marked individuals. In that locality, the function of the bypass is affected by water discharge, those exceeding 50 m3.s-1 increasing the water level below the weir, the water filling the lower part of the bypass.
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The round goby, a new alien species found in the confluence of the Morava and Dyje Rivers (Czech Republic)
Lusk, Stanislav ; Bartoňová, Eva ; Lusková, Věra ; Klíma, Ondřej
In 2008, the occurrence of the Round Goby (Neogobius melanostomus) was ascertained in the confluence area of the Morava and Dyje Rivers. This non-native species invaded the hydrographic network of the Czech Republic through its own migration activity from the Danube. In 2009, the species is already common in that area. Successful reproduction of this species has been evidenced by the occurrence of yearlings. Genetic analyses of mitochondrial gene cytochrome b ascertained high proximity hereof gene among populations from the Dyje and Dnieper Rivers. One haplotype only has been identified in the Dyje River which was as compared with the studies of Doherty et al. (1996) and Stepien & Tumeo (2006), closest to haplotype A. Analysis of the first intron of ribosomal protein has revealed five haplotypes, AM1 – AM5. The haplotypes AM1 – AM4 formed a separate group with haplotype AHC3 (Neilson & Stepien 2009) from the region of the Dnieper River near Kiev.
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Genetic diversity of grayling (Thymallus thymallus L.) populations in the Czech Republic inferred from microsatellite markers
Papoušek, Ivo ; Halačka, Karel ; Kohout, Jan ; Šlechta, Vlastimil ; Vetešník, Lukáš ; Mendel, Jan
The grayling is among the most valuable fish species in salmonid waters of the Czech Republic. Genetic diversity of twelve grayling populations from all three watersheds of the Czech Republic has been assessed by two multiplex analyses of ten microsatellite loci. Allele frequencies and tests of genotype frequencies for deviation from Hardy-Weinberg equilibrium were carried out. Relationships between respective populations were assessed by Factorial Correspondence Analysis and Principal Coordinate Analysis. Analysis of multilocus microsatellite genotypes from three watersheds of the Czech Republic has shown that significant variability is present in Czech grayling populations. However, this variability has no geographical structure; individuals from all three watersheds form no distinctive groups. It seems that the original genetic structure of Czech grayling populations has already been lost as they have been uniformized by artificial management.
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Fish assemblage and its exploitation in the Nové Mlýny reservoirs system
Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan
The fish assemblage and its exploitation in the Nové Mlýny reservoirs in 1986–2008 were analysed. Occurrence of 41 fish species (from 12 families) and 3-5 types of hybrids were registered. Newly the tubenose goby (Proterorhinus marmoratus) invaded the Věstonice and Nové Mlýny reservoirs. Dominance of autochthonous (riverine) fish species decreased. On the contrary, expressive increasing of Prussian carp (Carassius gibelio) and wels catfish (Silurus glanis) was ascertained. Average values of fish species diversity (H') and catch effort by entangling netting (C.P.U.E.) were 1,36 and 53.11 g.m2.h-1, respectively. The overall yearly yield in the Nové Mlýny reservoirs reached its maximum values in 1994 and 1995 with 153.1 and 148.8 kg.h-1 (474.6 and 461.3 tons). Annual fish catch (inclusive of common carp Cyprinus carpio) since 1995 to 2008 subsequently decreased. Currently (2008), it amounts 37.6 kg.h-1 and 116.5 tons, with a predominance of common carp (Dw = 64.5%).
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Spatio-temporal distribution of catches, growth and length-weight relationship of tagged common carp (Cyprinus carpio) in the fishing ground MRS Dyje 5, Novomlýnská reservoir, and in the related fishing grounds
Prokeš, Miroslav ; Baruš, Vlastimil ; Mareš, J. ; Habán, V. ; Peňáz, Milan
On the basis of spatio-temporal analyses of recaptured tagged common carp, the local movements (migrations), growth and length-weight parameters were monitored in the Novomlýnská reservoir. Generally, 28 % of fish migrated upstream within the distance of 28.9 km, 19 % of tagged recaptured fish migrated in downstream direction up to a distance of 30.5 km and 53 % of the studied fishs were stationary in the Novomlýnská reservoir. The highest migration activity was ascertained during the 1st and 2nd year after stocking. The recapture rate of the overall 10.000 stocked fish, was only 1 %. Already 12 months after stocking, the mean total length (TL) of recaptured fish reached 465 mm, weight (w) 2200 g and Fulton´s condition factor (FWCF) 2.45.
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