Nature-like fish passes have been designed with the intent to re-connect river corridors and provide passage for all species occurring in a system. Nature-like fish pass designs have been constructed in Europe and elsewhere with some success, but performance of these designs has not been evaluated for North American species. Re-establishing passage for adult anadromous clupeids to their spawning areas is critical considering their recent dramatic population declines. Two nature-like fish pass designs in New England were evaluated for passage of anadromous adult alewives (Alosa pseudoharengus) using passive integrated transponder (PIT) telemetry and showed differing results. At Town Brook in Plymouth, Massachusetts the 32 m long perturbation boulder rock ramp with a 1:24 slope passed 94% of attempting fish with most ascending in under 22 minutes. At East River in Guilford, Connecticut the 48 m long steppool bypass design with a 1:14 slope passed only 40% of attempting fish with a median transit time of 75 minutes. Two technical fishway designs at the field sites were also evaluated and showed contrasting performance. At Town Brook a 14 m long 1:7 slope pool and weir fishway exhibited attraction and passage deficiencies. At East River two 3.05 m long steeppass fishways both passed the majority of attempting fish but one steeppass fishway may have had poor attraction efficiency. At both sites tagged fish passed rapidly downstream through the fish passes after spawning. Nature like fish pass designs are suitable for the passage of alewife but further evaluations are required to more precisely identify the influence of vertical drop per pool and specific local hydraulics on behaviors and passage performance for this species.

Sistemas para a Transposição de Peixes são implantados para atenuar os efeitos negativos dos barramentos sobre os peixes migradores ou de piracema. No Brasil, como na maioria dos paises subdesenvolvidos, devido a fatores históricos, financeiros, políticos, institucionais e culturais desfavoráveis, há uma defasagem tecnológica quanto aos Sistemas para a Transposição de Peixes, pelo menos secular, com conseqüências imensuráveis ao ambiente e ao universo dos peixes. A importância dos nossos peixes fluviais, onde se destacam os migradores como os de maior interesse comercial e esportivo, é indiscutível. Assim, esta dissertação propõe-se a inventariar o "estado da arte" dos Sistemas para a Transposição de Peixes, isto é, conhecer as necessidades dos nossos peixes, estudar alternativas hidráulico-estruturais de transposição e, também, vencer as correntes retrógradas. Os estudos e projetos internacionais não devem ser aplicados indiscriminadamente para a realidade nacional, pois diferem quanto à diversidade dos nossos peixes, sob a pena de incorrer nos insucessos como os australianos africanos e os brasileiros. Nesta dissertação, após à introdução, há um breve relato sobre a importância entre as relações ecológicas e ambientais; relações entre os elementos vivos e o meio aquático e as interferências humanas; conhecimentos físicos e biológicos sobre os peixes; história, conceitos fundamentais e legislação sobre os STP's; estudos para viabilização de estruturas-tipo, em modelo reduzido e estudos futuros. / Fish Transponding System are usually adopted to mitigate negative effects of dam and reservoir construction on migratory fishes. In Brazil, as with most undeveloped countries, owing to historical, political, economical and cultural adverse factors, there is a centenary technological gap relating Fish Transponding System, which has caused unbearable consequences to environment and to the fish realm. The importance of our fluvial fishes, among which the migratory ones represent major commercial and sportive interest, is unquestionable. This dissertation intends to furnish information on the State of the Art in Fish Transponding System, to present native fish habits and needs, to compare hydraulic and structural transponding system types and, last but not least, to introduct a new way of facing and dealing with fish transponding problems, in a contribution to breaking the prevailing retrograde vision. This dissertation shows that international current projects and practices should not be adopted widespread to national reality, as they usually don’t match our fishes habits and needs; the adoption of those practices could lead to a project breakdown, according to some recorded Australian, African, and even Brazilian experiences. The work also presents a brief explanation on: ecological and environmental relations; living specimens, aquatic media and human actions; Fish physical and biological knowledge; history, basic concepts and legislation about FTS; considerations aiming to make feasible standard structures, reduced scale models and further investigations.

Sistemas para a Transposição de Peixes são implantados para atenuar os efeitos negativos dos barramentos sobre os peixes migradores ou de piracema. No Brasil, como na maioria dos paises subdesenvolvidos, devido a fatores históricos, financeiros, políticos, institucionais e culturais desfavoráveis, há uma defasagem tecnológica quanto aos Sistemas para a Transposição de Peixes, pelo menos secular, com conseqüências imensuráveis ao ambiente e ao universo dos peixes. A importância dos nossos peixes fluviais, onde se destacam os migradores como os de maior interesse comercial e esportivo, é indiscutível. Assim, esta dissertação propõe-se a inventariar o "estado da arte" dos Sistemas para a Transposição de Peixes, isto é, conhecer as necessidades dos nossos peixes, estudar alternativas hidráulico-estruturais de transposição e, também, vencer as correntes retrógradas. Os estudos e projetos internacionais não devem ser aplicados indiscriminadamente para a realidade nacional, pois diferem quanto à diversidade dos nossos peixes, sob a pena de incorrer nos insucessos como os australianos africanos e os brasileiros. Nesta dissertação, após à introdução, há um breve relato sobre a importância entre as relações ecológicas e ambientais; relações entre os elementos vivos e o meio aquático e as interferências humanas; conhecimentos físicos e biológicos sobre os peixes; história, conceitos fundamentais e legislação sobre os STP's; estudos para viabilização de estruturas-tipo, em modelo reduzido e estudos futuros. / Fish Transponding System are usually adopted to mitigate negative effects of dam and reservoir construction on migratory fishes. In Brazil, as with most undeveloped countries, owing to historical, political, economical and cultural adverse factors, there is a centenary technological gap relating Fish Transponding System, which has caused unbearable consequences to environment and to the fish realm. The importance of our fluvial fishes, among which the migratory ones represent major commercial and sportive interest, is unquestionable. This dissertation intends to furnish information on the State of the Art in Fish Transponding System, to present native fish habits and needs, to compare hydraulic and structural transponding system types and, last but not least, to introduct a new way of facing and dealing with fish transponding problems, in a contribution to breaking the prevailing retrograde vision. This dissertation shows that international current projects and practices should not be adopted widespread to national reality, as they usually don’t match our fishes habits and needs; the adoption of those practices could lead to a project breakdown, according to some recorded Australian, African, and even Brazilian experiences. The work also presents a brief explanation on: ecological and environmental relations; living specimens, aquatic media and human actions; Fish physical and biological knowledge; history, basic concepts and legislation about FTS; considerations aiming to make feasible standard structures, reduced scale models and further investigations.

The construction of fish passes has been a longstanding measure to improve river ecosystem status by ensuring the passability of weirs, dams and other in- channel structures for migratory fish. Many fish passes have a low biological effectiveness because of unsuitable hydrodynamic conditions hindering fish to rapidly detect the pass entrance. There has been a need for techniques to quantify the hydrodynamics surrounding fish pass entrances in order to identify those passes that require enhancement and to improve the design of new passes. This PhD thesis presents the development of a methodology for the rapid, spatially continuous quantification of near-pass hydrodynamics in the field. The methodology involves moving-vessel Acoustic Doppler Current Profiler (ADCP) measurements in order to quantify the 3-dimensional water velocity distribution around fish pass entrances. The approach presented in this thesis is novel because it integrates a set of techniques to make ADCP data robust against errors associated with the environmental conditions near engineered in-channel structures. These techniques provide solutions to (i) ADCP compass errors from magnetic interference, (ii) bias in water velocity data caused by spatial flow heterogeneity, (iii) the accurate ADCP positioning in locales with constrained line of sight to navigation satellites, and (iv) the accurate and cost-effective sensor deployment following pre-defined sampling strategies. The effectiveness and transferability of the methodology were evaluated at three fish pass sites covering conditions of low, medium and high discharge. The methodology outputs enabled a detailed quantitative characterisation of the fish pass attraction flow and its interaction with other hydrodynamic features. The outputs are suitable to formulate novel indicators of hydrodynamic fish pass attractiveness and they revealed the need to refine traditional fish pass design guidelines.

The purpose of my diploma thesis was tracking of new build fish pass on upper part of the Blanice river in cadastral area of Zábrdí.This fish pass is situated in area up stream from road bridge in village Zábrdí.For the data collection it was used a direct fishing of fish by portable electric unit.Direct fishing were carried out on 50 meters section under fish pass and in fish pass itself.Catching of fish was carried out in period from January to October 2008. There was realized total 10 catches .For a evaluation of migration permeability was used 336 pieces from 6 fish species,concretely it was Salmo trutta m. fario, Thymallus thymallus , Cottus gobio , Leuciscus cephalus, Leuciscus leuciscus, Lota lota, which was caught in tracked section of Blanice river ( 50 m section towards body of weir ) and 105 pieces from 4 fish species (Salmo trutta m. fario,Thymallus thymallus , Cottus gobio, Lota lota),caught in a body of fish pass. Of these results specific and size characteristics were determinated.Caught fish was determinated,measured and returned to aquatic environment.

The Diploma Thesis deals with the design of rekonstruction of the controlled weir ´´Prizrenice“ on the river Svratka to a new gate weir structure. The first part focuses on teoretical intro and the processing of data on the area of interest and the selection of appropriate design solution for the reconstruction of the weir, where there are described several types of movable gate. As a part of sollution, there will be design of small hydro power station. At the end of this part the current condition of the buildings and the channel of the Svratka river in the area of interest is evaluated. In the second part, the Thesis deals with the design of the gate weir structure and its subsequent assessment. At first, the solid substructure and the height of the gate is designed and assessed. Subsequently, the stilling basin is designed and in conclusion, the overall stability of the designed structure is assessed.

The content of this diploma thesis is a feasibility study of a small hydropower station within the navigation lock Přelouč II. This work builds on the framework proposal of one variation of layout arragement of the navigation lock. In this variant is considered to build a lock, which also includes a small hydropower station. At the beginning, the location of individual building objects is resolved with respect to the conditions in the locality. This is followed by a more detailed development of the building and technological part of a small hydropower plant. Part of the thesis is accompanying and technical report, drawing documentation, hydrotechnical and hydroenergetic calculations and photographic documentation.

This thesis describes the current state of the river Oslava in Oslavany design and reconstruction of the existing fixed weir in the affected location. As a best alternative reconstruction of the existing fixed weir reconstruction was chosen the hard threshold floating weir inflatable weirs. The next part of the thesis describes the proposed solution, and the last part of the thesis deals with the assessment of the proposed solutions.

This present work deals with the design of revitalization measures for the weir in Uherčice (Vranovice) on the river Svratka. The current condition of weir constuction does not allow aquatic animals to migrate, weir constuction is transverse barrier. In this river section are found many fish species like barbel, vimba, nase and chub, for which is migration completely natural part of their behavior. There is concrete weir with a movable flap and on the right bank is located a small hydroelectric power plant. Close to hydroelectric power plant outlet is mouth of Šatava river. Weir revitalization consists of fish pass construction. Proposed fish pass is located on the right bank of the stream. There is a close-to-nature bypass channel that will ensure a continuity of water flow of already mentioned river Svratka between Věstonice lake and Rajhrad weir. Entrance to the fish pass will use a part of Šatava mount, then will continue in the artificial channel to the upstream part of Svratka river. Fish pass exit cannot breake the function of protective anti-flood embankment of Svratka river, hence there will be used block off construction. During condition of flooding will exist the possibility to shut down proposed fish pass.