Sökning: "spawning bed"
Visar resultat 1 - 5 av 6 uppsatser innehållade orden spawning bed.
1. Aspects of erosion of restored trout spawning beds in two streams in Northern Sweden
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : Many rivers and streams in northern Sweden have been channelized due to timber floating. This has severely degraded the spawning habitats for salmon and trout, and therefore a common action when restoring channelized rivers is to establish new spawning beds by adding gravel to the streambed. LÄS MER
2. Laxens uppströmsvandring i den restaurerade och flödesreglerande Umeälvens nedre del
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : The expansion of hydroelectric power has negatively affected the Baltic stock of Atlantic salmon (Salmo salar L.). To enable spawning migration of salmon in flow controlled rivers with intact wild stocks, bypass channels and resting pools with smaller flows are constructed to help salmonids in their migration upstream. LÄS MER
3. Predicting spawning bed erosion and longevity : a case study in tributaries to river Vindelälven, northern Sweden
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : Timber floating operations in Scandinavia during the 19th and 20th centuries has contributed to severe negative impacts on riverine ecosystems. Increase in water velocity and lack of stream bed heterogeneity as a result of stream channelization lead to increased bed load transport. LÄS MER
4. Spawning site selection of brown trout in habitat restored streams
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : During the timber floating era, most of Sweden’s watercourses were altered. This decreased the amount of available spawning habitats for salmonids, and hence had a negative effect on the riverine brown trout (Salmo trutta) populations. Reconstruction of spawning grounds is today a common measure in restoration of altered streams in Sweden. LÄS MER
5. Förstudie av en ny regleringsdamm vid Finsjö - En projektspecifik studie för Finsjö Övre kraftverk
Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Avdelningen för Teknisk vattenresursläraSammanfattning : The hydropower plant at upper Finsjö is situated in the south-eastern part of Sweden. It is owned and operated by E.ON Vattenkraft Sverige AB. The dams are built in the beginning of the 20th century and regarding the safety of the dams they are in need of repairs. LÄS MER