Sökning: "Spawning habitat"

Visar resultat 6 - 10 av 43 uppsatser innehållade orden Spawning habitat.

  1. 6. Gäddans val av lekvikar : Vilka faktorer bestämmer tätheterna av vuxna gäddor i Bottenhavets vikar?

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Simon Ingvald; [2023]
    Nyckelord :Northern pike; Esox lucius; pike recruitment; spawning habitat; rod fishing inventory;

    Sammanfattning : Northern pike (Esox lucius L) populations have been declining along the east coast of Sweden, including the Gävleborg coast. This negative trend is believed to be caused by factors related to pike recruitment including loss of suitable spawning habitats. LÄS MER

  3. 7. Evaluation of restoration efforts in Dalälven - conditions for survival rate of Salmo trutta and Salmo salar

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Ville Svärd; [2023]
    Nyckelord :Restoration; river; salmonids; benthic fauna;

    Sammanfattning : Rivers are among the most anthropogenically affected ecosystems in the world by irrigation, transportation, channelizing, and hydropower. Habitat restorations have become a popular method to restore the heterogeneity and complexity of rivers aiming for improvement of biodiversity. LÄS MER

  4. 8. A recipe for fish and SNPs : Filling the blanks for conservation genomics of Swedish wels catfish (Silurus glanis) populations

    Master-uppsats, Uppsala universitet/Institutionen för ekologi och genetik; Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Lars Littmann; [2022]
    Nyckelord :Catfish; Silurus glanis; Genomics; Genetics; Conservation; Mitochondrial; Whole-genome; NGS; Sweden;

    Sammanfattning : Swedish populations of Wels catfish (Silurus glanis) experienced severe declines during the 19th and 20th centuries. The main causes for the decline were loss of suitable spawning habitat and fragmentation of populations. Currently, three native and two reintroduced populations remain in Sweden. LÄS MER

  5. 9. Evaluating an increased spill regime as a management tool to improve downstream passage of salmon smolt

    Master-uppsats, Karlstads universitet/Institutionen för miljö- och livsvetenskaper (from 2013)

    Författare :Mattias Hansson; [2022]
    Nyckelord :hydraulic modeling; hydroacoustic telemetry; time to event analysis; hydraulisk modellering; överlevnadsanalys; hydroakustisk telemetri;

    Sammanfattning : The anadromous Atlantic salmon (Salmo salar) is dependent on river connectivity to reach spawning and rearing habitats in rivers. Most rivers are today fragmented by artificial barriers such as hydroelectric powerplants (HEP) which impede this migratory movement. LÄS MER

  7. 10. Klimatförändringarnas påverkan på juvenila laxfiskars vinteröverlevnad och tillväxt i ett korttidsreglerat vattendrag

    Kandidat-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Författare :Joel Schill; [2022]
    Nyckelord :Korttidsreglering; öring; lax; Gullspångsälven; inSTREAM;

    Sammanfattning : Already within 10-20 years, the average temperature risks exceeding the 1.5 degree target limit and we can expect more extreme weather in the form of increased precipitation. Hydropower plants hinder the possibility of freshwater species to migrate between for example their spawning grounds and rearing habitat. LÄS MER