Sökning: "sea trout"

Visar resultat 16 - 20 av 26 uppsatser innehållade orden sea trout.

  1. 16. Utvärdering av rörelsemönster hos öring (Salmo trutta) utifrån otolitmikrokemi

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

    Författare :Magdalena Andersson; [2014]
    Nyckelord :öring; otolit; migration; mikrokemi;

    Sammanfattning : The classic view of trout (Salmo trutta) life history is that trout begins its life in freshwater, migrates to the ocean after about 1-4 years and then returns to freshwater to spawn. As trout fry have been caught at the mouth of the River Emån, near the Baltic Sea, researchers have speculated that some trout emigrate during their first year of life. LÄS MER

  3. 17. Screening of blood and mucus parameters towards breeding for resistance to salmon louse (lepeophtheirus salmonis) in atlantic salmon

    Master-uppsats, SLU/Dept. of Animal Breeding and Genetics

    Författare :Das Amit; [2012]
    Nyckelord :Sea lice; parasite resistance; disease resistance; genetic variation; Atlantic salmon; Rainbow trout; biological markers;

    Sammanfattning : Over the last three decades salmon farmers have experienced serious economic hardships due to losses caused by sea lice (Lepeophtheirus salmonis) infestations. In the absence of an effective vaccine, inefficiency of biological control methods and growing concerns over the usage of chemical treatments, there is a quest for alternative strategies to combat this problem. LÄS MER

  4. 18. Havsöringens (Salmo trutta) lekvandring i Själsöån, Gotland.

    Kandidat-uppsats, Institutionen för kultur, energi och miljö

    Författare :David Bystedt; [2012]
    Nyckelord :Havsöring Laxfiskar Salmo Reproduktion Gotland;

    Sammanfattning : In this study, the sea trout (Salmo trutta) spawning migration was studied in the river Själsöån, Gotland, to assess the main external factors determining upstream migration and seasonal changes in fish parameters. Additionally population trends were studied by examination of old data. LÄS MER

  5. 19. Vandring av vårlekande fisk och jämförelse av fångst mellan ryssja och strömöversiktsnät i Hammerstaån, Stockholms län

    Kandidat-uppsats, Institutionen för fysik, kemi och biologi

    Författare :Ulf Johansson; [2011]
    Nyckelord :Spring-spawning fish; inventory; Migation; bream; fyke nets; Strömöversiktsnät; Hammerstaån; Muskån; Vårlekande fisk; karpfiskar; vimma; inventering; provfiske;

    Sammanfattning : During the last two hundred years many wetlands and streams in Sweden have been lowered to provide land for agriculture and forestry. Some of the coastal wetlands and streams probably served as spawning sites for certain species of fish in the Baltic Sea, but the present situation is not well known. LÄS MER

  7. 20. Vandring av vårlekande fisk och jämförelse av fångst mellan ryssja och strömöversiktsnät i Hammerstaån, Stockholms län

    Kandidat-uppsats, Institutionen för fysik, kemi och biologi

    Författare :Ulf Johansson; [2011]
    Nyckelord :Migration; inventory; spring-spawning fish; bream; fyke nets; perch; strömöversiktsnät; Hammerstaån; Muskån; vårlekande fisk; vimma;

    Sammanfattning : During the last two hundred years many wetlands and streams in Sweden have been lowered to provide land for agriculture and forestry. Some of the coastal wetlands and streams probably served as spawning sites for certain species of fish in the Baltic Sea, but the present situation is not well known. LÄS MER