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Hevlín – place in the landscape
Kubíčková, Karolína ; Veselá, Markéta (referee) ; Foretník, Jan (advisor)
The aim of the thesis is to create a landscape that supports water retention and helps the river Dyje to create a branched, meandering watercourse. The design also deals with the permeability of the territory and the design of wooden objects that respond in function and shape to the created landscape.
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Hevlín – place in the landscape
Kubíčková, Karolína ; Veselá, Markéta (referee) ; Foretník, Jan (advisor)
The aim of the thesis is to create a landscape that supports water retention and helps the river Dyje to create a branched, meandering watercourse. The design also deals with the permeability of the territory and the design of wooden objects that respond in function and shape to the created landscape.
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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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Exploatation characteristic of barbel, nase, chub and ide in the riverine and lake ecosystems
Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan
The exploatation characteristics of four potamodromous fish species, barbel (Barbus barbus), nase (Chondrostoma nasus), chub (Leuciscus cephalus) and ide (L. idus) obtained in the riverine and so-called lacustrine (man-made lake) ecosystem, exemplified on the fishing ground Dyje 7 on the river Dyje, is documented. Based on the analyse of many-year catch data of mentioned fish species, the influence of stream fragmentation was revealed upon the abundance reduction of natural populations of rheophilic fish species of concerning Dyje river sectin (located at the Mušov reservoir), as well as a necessity of strengthening these populations in the adjacent stream sections, especially by stocking of artificially produced fry, and in near future also by the construction of the new functional fish ladders.
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Phases of the ontogenesis of the Mušov Reservoir of the waterwork Nové Mlýny - fish yield and condition parameters of silver bream (Blicca bjoerkna)
Baruš, Vlastimil ; Peňáz, Milan ; Prokeš, Miroslav
Overall yields of the carp and of the non-preferred group of coarse "other fish" exhibited in the Mušovská nádrž Reservoir (Fishing ground MRS Dyje 7) significant changes during 1981-2001. The decrease of yield during 1996-1999 is significantly correlated with a decreased fishing pressure (number of fishing visits per year and hectare of fishing ground) while it insignificantly correlates with the quantity of annually stocked carps. The length/weight relationship of the silver bream, if comparing the values from 1980 with those from 1996, exhibit a significant drop. It was concluded, that the reservoir is actually in a phase of stabilised production and characteristic by a feeding competition between the carp as a preffered game fish and the coarse fishes. Also an increased predation by wells exhibited on the non-predatory fishes including the stocked carp can not be excluded.
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