Essays about: "spawning bed"
Found 5 essays containing the words spawning bed.
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1. Aspects of erosion of restored trout spawning beds in two streams in Northern Sweden
University essay from SLU/Dept. of Wildlife, Fish and Environmental StudiesAbstract : 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. READ MORE
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2. Laxens uppströmsvandring i den restaurerade och flödesreglerande Umeälvens nedre del
University essay from SLU/Dept. of Wildlife, Fish and Environmental StudiesAbstract : 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. READ MORE
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3. Predicting spawning bed erosion and longevity : a case study in tributaries to river Vindelälven, northern Sweden
University essay from SLU/Dept. of Wildlife, Fish and Environmental StudiesAbstract : 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. READ MORE
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4. Spawning site selection of brown trout in habitat restored streams
University essay from SLU/Dept. of Wildlife, Fish and Environmental StudiesAbstract : 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. READ MORE
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5. How can the Freshwater Pearl Mussel's (Margaritifera margaritifera) Situation Become Better in Lekhyttan
University essay from Fakulteten för samhälls- och livsvetenskaperAbstract : Abstract This study takes up a local issue in the village of Lekhyttan, where Johan Molin is concerned about the freshwater pearl mussels (Margaritifera margaritifera) situation. He is a landowner and wonders what the situation is for the mussels and what he himself possibly can do, to hopefully improve their situation. READ MORE
