Essays about: "Sävarån"

Found 5 essays containing the word Sävarån.

  1. 1. Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Mattias Alftberg Melin; [2019]
    Keywords : Growth; Burbot; Temperature; Age distribution; Climate change;

    Abstract : Many populations of burbot (Lota lota)around the world have been extirpated, are endangered or are in serious decline both regarding numbers but also in size. The aim of this study was to investigate if growth and overall condition in populations of anadromous burbot in the Gulf of Bothnia has changed over time and if so, discuss potential causes behind. READ MORE

  3. 2. Life history trade-offs in Anadromous Burbot Lota lota (Linnaeus 1758) from Rickleån and Sävarån, Northern Sweden

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

    Author : Mikael Sandberg; [2015]
    Keywords : life history trade-offs; anadromous burbots; Bothnian Bay; Rickleån; Sävarån; otoliths;

    Abstract : Anadromous burbots Lota lota (Linnaeus 1758) from two similar rivers in the Gulf of Bothnia area, Sävarån and Rickleån, Northern Sweden, were compared. The aim was to test for and explain differences in ecology. Spawning burbots in Sävarån were smaller, younger, grew slower and were more densely populated. READ MORE

  4. 3. Laxsmoltens (Salmo salar) längd, vikt och konditionsfaktors betydelse för dess vandringstidpunkt i Sävarån

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Daniel Bertilsson; Adam Helleber; [2014]
    Keywords : Salmo salar; smolt; Sävarån; storlek; vandring; tidpunkt;

    Abstract : Atlantlaxen (Salmo salar) har en komplex livscykel. Den lever sitt liv i både i sötvatten och saltvatten och migrationen mellan dessa två är en viktig process för laxens överlevnad. Laxen i Östersjön har minskat kraftigt under de senaste hundra åren och mänsklig påverkan tros ha minskat laxproduktionen med upp till 95 %. READ MORE

  5. 4. Utvärdering av den nationella databasen över åtgärder i vatten i fem svenska huvudavrinningsområden

    University essay from SLU/Dept. of Aquatic Sciences and Assessment

    Author : Jenny Hesselgren; Linnea Ingesdotter; [2012]
    Keywords : akvatiska system; avrinningsområden; biotopvård; fisktrappa; restaurering;

    Abstract : Restoration projects are planned and carried out in order to reduce the impact due to anthropogenic influence and to achieve at least good ecological status according to the EU Water Framework Directive. The resilience effort of such restorations is however ambiguous. 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