Search for dissertations about: "Fish Migration"

Showing result 16 - 20 of 58 swedish dissertations containing the words Fish Migration.

  2. 16. Predation as a driver of reproductive isolation - from adaptive divergence to hybrid inviability

    Author : Varpu Pärssinen; Enhet akvatisk ekologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; reproductive isolation; ecological speciation; predation; adaptive radiation; evolution; behaviour; fish;

    Abstract : Natural selection can play an important role in the origin of new species. When reproductive isolation evolves as a result of ecologically-based divergent natural selection, the process is referred to as ecological speciation. In most organisms, sufficient reproductive isolation is considered to be essential for the establishment of new species. READ MORE

  4. 17. Development of photoreceptor organs in teleosts, Molecular and immunocytochemical studies

    Author : Johan Forsell; Tumörmikromiljö; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fish; opsin; extraretinal; retina; Development; pineal organ; Zoology; Zoologi;

    Abstract : Many vertebrate animals are known to have multiple sites for photoreception that are not involved in vision. Extraretinal photoreception is indicated to play a crucial role in early development, physiology and behavior, as well as in later biological processes. READ MORE

  5. 18. Cross-scale mechanisms and adaptation strategies in Small-Scale Fisheries

    Author : Blanca González-Mon; Maja Schlüter; Beth Fulton; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Small-Scale fisheries; networks; agent-based modelling; trade; migration; mobility; diversification; Sustainability Science; vetenskap om hållbar utveckling;

    Abstract : Small-Scale Fisheries (SSF) are increasingly facing shocks and changes that affect their capacity to provide food and maintain the livelihoods of millions of people who depend on fishing activities. At the same time, SSF influence and are influenced by interactions across scales, where interdependencies between different places are increasingly evident. READ MORE

  6. 19. Towards a Better Understanding and Control of Factors Affecting the Physical Quality of Fish Feed

    Author : Julia Wolska; Bioteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fish Feed; Physical quality; Durability; Aging; Crosslinking; Transglutaminase;

    Abstract : As aquaculture expands, the volume of fish feed produced and transported must also increase. Therefore a better understanding and increased control of the factors that influence the physical quality of feed pellets is required. To achieve this goal, reliable methods measuring the physical quality of feed are needed. READ MORE

  7. 20. Trophic interactions and behaviour : Studies relevant to a Baltic Sea biomanipulation

    Author : Per B. Holliland; Sture Hansson; Elena Gorokhova; Peter Tiselius; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; zooplankton; non-indigenous species; selectivity; food web; rearing environment; fish stocking; Sander lucioperca; diel vertical migration; ontogeny; ovigerous; Marine Ecology; marin ekologi;

    Abstract : The main theme of this thesis is the interactions of animals with the environment and each other. The thesis was written within the framework of a biomanipulation project “Pikeperch in Himmerfjärden”. READ MORE