Essays about: "parr"

Showing result 1 - 5 of 15 essays containing the word parr.

  1. 1. Effects of summer peaks on brown trout and Atlantic salmon growth and survival in hydropower-regulated Gullspång River

    University essay from Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Author : Oscar Hallberg; [2023]
    Keywords : hydropeaking; hydropower; fish; salmon; salmo salar; salmo trutta; summer; survival; growth; parr; fry; korttidsreglering; vattenkraft; salmonid; salmo salar; salmo trutta; tillväxt; överlevnad; lax; öring;

    Abstract : Daily demands for electrical power are met through sub-daily release of turbined water in the form of hydropeaking. Hydropeaking’s changes to stream flow are listed as a threat to biodiversity in river ecosystems as it causes rapid habitat alteration such as increased depth and velocity, affecting the species living downstream. READ MORE

  3. 2. Dispersal and habitat use of juvenile brown trout (Salmo trutta) following egg stocking : -A case study in the river Rotälven, Sweden

    University essay from Karlstads universitet/Institutionen för miljö- och livsvetenskaper (from 2013)

    Author : Jonathan Larsson; [2022]
    Keywords : brown trout; egg stocking; dispersal; alevin; fry; parr; redd; habitat preference; Öring; romutsättning; spridning; yngel; parr; habitatpreferens;

    Abstract : Egg stocking in rivers and streams is a common measure to support and re-introduce salmonid populations. To ensure the success of egg stocking programs, knowledge of the early life stages of juveniles including dispersal ability and habitat preferences of fry is a prerequisite. READ MORE

  4. 3. Future management of Laisriver Brown trout : what life history and enhancement strategy should be prioritized?

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

    Author : Isak Landström; [2021]
    Keywords : salmo trutta; acoustic telemetry; spawning migration; hatchery-reared; genetic assignment; sea-run; resident; laisälven;

    Abstract : The life history and coexistence of subpopulations of brown trout in the same drainage area are relatively well known. The three forms of trout; sea-run, lake-run and resident, can all be present in the same location at some period of their life cycle, e.g. during the parr stage or at spawning. READ MORE

  5. 4. Smoltification status of Atlantic salmon (Salmo salar) in relation to migratory success and migration speed in a regulated river

    University essay from Karlstads universitet

    Author : Johanna Högvall; [2020]
    Keywords : Atlantic salmon; juvenile downstream migration; parr-smolt transformation; regulated rivers; dams; migration delay; radio-telemetry; Atlantlax; vandringshinder; smoltifieringsgrad; reglerade älvar; radiotelemetri;

    Abstract : There is a concern that the ecosystems around the world are suffering from fragmentation. Ecosystems such as rivers have lost their connectivity to a large extent due to hydroelectric dams with no or insufficient passways for the natural flow of organisms, matter and energy. READ MORE

  6. 5. Liquefaction of Softwood Bark towards Biochemicals and Biofuels

    University essay from Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Author : Emma Nordström; [2018]
    Keywords : Softwood; Bark; Liquefaction; Hytrotropic acid; Lignin; Biofuel; Bio-oil; Spruce; Catalyst; Zeolite;

    Abstract : The energy consumption in the world is increasing at the same time as the fossil fuel resources are limited. This is causing a rising interest in renewable energy sources over the world. To reduce dependency on fossil fuel sources biomass is an excellent alternative. READ MORE