Essays about: "öring"

Showing result 16 - 20 of 29 essays containing the word öring.

  1. 16. Foraging efficiencies on drifting and benthic prey in juvenile salmonids - effect of light

    University essay from Karlstads universitet/Institutionen för miljö- och livsvetenskaper

    Author : Pia L. M. Larsson; [2016]
    Keywords : Foraging; benthic; prey; drifting; salmon; trout; salmonids; light; day; night;

    Abstract : Stream living salmonids are generally regarded as drift feeders that rely upon their vision when foraging. It has been shown that salmonids become nocturnal at low water temperatures, but have a low foraging efficiency as light intensity is low, due to their dependence upon vision. READ MORE

  3. 17. Dispersal of young-of-the-year brown trout (Salmo trutta L.) from spawning beds : effects of parental contribution, body length and habitat

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

    Author : Susanna Andersson; [2016]
    Keywords : egg stocking; electrofishing; SNP; dispersal distances; habitat preferences;

    Abstract : Stocking of brown trout eggs Salmo trutta L. and construction of spawning beds are common measures in habitat restored streams. However, knowledge about how young-ofthe-year (YOY) trout disperse from stocking points and spawning beds, and how it relates to biotic and abiotic factors, are sparse. READ MORE

  4. 18. Freshwater pearl mussel as indicators of Swedish streams - a comparison between freshwater pearl mussel and biological quality elements

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

    Author : Kristin Forsell; [2014]
    Keywords : flodpärlmussla; biologiska kvalitetsfaktorer; freshwater pearl mussel; biological quality elements;

    Abstract : The freshwater pearl mussel (Margaritifera margaritifera) is a large freshwater mussel. Because of its sensitivity to human impact, such as eutrophication, acidification and alterations of hydromorphology, the species is considered as a robust indicator of stream water quality and biodiversity. READ MORE

  5. 19. 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 Studies

    Author : Viktor Tylstedt; [2013]
    Keywords : Salmo trutta; stream restoration; longevity; erosion; spawning bed; Vindelälven;

    Abstract : 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

  6. 20. Död ved i vatten - funktionella strukturer och dess påverkan på öring (Salmo trutta, L.)

    University essay from SLU/School for Forest Management

    Author : Anton Bondesson; [2013]
    Keywords : LWD; Hedströmmen; half log;

    Abstract : The background to this work was to see if there was a connection between large woody debris (LWD) and the presence of brown trout in our Swedish forest streams. Previous researches by Degerman et al. (2004) have shown that there is a strong correlation between the amount of dead wood and the presence of brown trout. READ MORE