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Showing result 1 - 5 of 7 essays matching the above criteria.

  1. 1. MODELLING THE SMOLT PRODUCTIVITY OF BROWN TROUT (SALMO TRUTTA) IN HAGA Å

    University essay from Göteborgs universitet / Instiutionen för biologi och miljövetenskap

    Author : Lukas Almgren; [2023-10-30]
    Keywords : Brown trout; Salmo trutta; Trout habitat score; THS; Haga å; electro-fishing survey;

    Abstract : The brown trout (Salmo trutta) is a facultatively anadromous species, some individuals migrate from the rearing environment in the rivers to the sea while other individuals stay in fresh water. To determine the suitability of a stream for juvenile trout the organization SGBALANST has developed what is called the "Trout habitat score" (THS) model. READ MORE

  3. 2. Sampling methods of the wels catfish (Silurus glanis) in freshwater lakes : management of a vulnerable species

    University essay from SLU/Dept. Of Aquatic Resources

    Author : David Östby; [2018]
    Keywords : sampling; gear; monitoring; Wels catfish; Silurus glanis; management; vulnerable spieces; electrofishing; acoustic camera; fyke nets; lake;

    Abstract : Sweden hosts the northernmost natural population of wels catfish (Silurus glanis) in the world. The populations of the species decreased severely in the 20th century, mainly due to different sources of anthropogenic impact. READ MORE

  4. 3. Naturvärdesbedömning och klassificering enligt blå målklasser av vattendrag : en utvärdering av metod och lämplighet för skogsbruksplaner

    University essay from SLU/Southern Swedish Forest Research Centre

    Author : Torbjörn Ingemarsson; [2012]
    Keywords : naturvärdesbedömning; vattendrag; metod; lämplighet; skogsbruksplaner;

    Abstract : Syftet med fältstudien var att validera WWF:s metod för naturvärdesbedömning av vattendrag och blå målklasser som trovärdiga redskap för att spegla fiskförekomsten och den biologiska mångfalden i vattendrag. Litteraturstudien visade vad som kan styra fiskförekomsten samt hur skogsbruket idag och historiskt har påverkat vattendragen och hur skogliga åtgärder kan påverka vattendragens naturvärde och vatten kvalitén. READ MORE

  5. 4. Enumerating Atlantic salmon smolt production in River Vindelälven based on habitat availability and parr densities : consequences of using different density estimation methods

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Stefan Ågren; [2010]
    Keywords : Salmo salar L.; Mapping; Juvenile nursery areas; Electrofishing abundance; Flow correlation; Population model;

    Abstract : Habitat mapping was conducted in the main stem of River Vindelälven in the autumn of 2009 along the salmon distribution area. The aim was to estimate the quantity of potential reproduction areas, including spawning and juvenile rearing habitats. The mapping included 61 km of various stream sections along the river length of 269 km. READ MORE

  6. 5. Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Johan Molin; [2008]
    Keywords : mapping; flow; substratum; electro-fishing; parr; radio-telemetry; spawning;

    Abstract : Even though the European Union has set up goals for rivers that support wild salmon to reach a production that is 50% of the MAXIMUM natural potential, there is a general lack of knowledge about the production capacity of salmonids in Sweden. To estimate the production of salmon and sea trout in the Sävarån river, I combined habitat mapping with available electro-fishing data. READ MORE