Sökning: "Fishing gear"

Visar resultat 11 - 15 av 16 uppsatser innehållade orden Fishing gear.

  1. 11. Selective fishing gear : A review on the effects of selective fishing gear on cod in the Baltic Sea

    Kandidat-uppsats, Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

    Författare :Karl Johan Modig; [2013]
    Nyckelord :Baltic Sea; Atlantic cod Gadus morhua ; fishing mortality; fisheries induced evolution;

    Sammanfattning : The populations of Atlantic cod (Gadus morhua) in the Baltic Sea has been heavily exploited for decades, with fishing mortalities close to, and for several occasions, even above one. The larger part of the spawning stock biomass is consequently being removed each year. LÄS MER

  2. 12. Evolutionary pressures under the current fishing practices in European hake (Merluccius merluccius)

    Master-uppsats, Lunds universitet/Examensarbeten i biologi

    Författare :Dunja Jusufovski; [2013]
    Nyckelord :Biology and Life Sciences;

    Sammanfattning : Abstract There is a rising concern involving the impact of modern fisheries on the dynamics and viability of the exploited fish populations. The increasing fishing pressure has been recorded to cause declines in age and size at maturation in variety of marine fish species. LÄS MER

  3. 13. Threats and opportunities for the survival of the Yangtze finless porpoise

    Kandidat-uppsats, SLU/Dept. of Animal Environment and Health

    Författare :Angelica Åsberg; [2012]
    Nyckelord :yangtze finless porpoise; freshwater cetacean; threats; future prospects; behaviour;

    Sammanfattning : The Yangtze finless porpoise (Neophocaena phocaenoides asiaorientalis), is a small freshwater cetacean which has recently fallen dramatically in number. It is an endemic species for the Yangtze River and unless drastic action is taken, it risks the same fate as the now functionally extinct Yangtze river dolphin (Lipotes vexillifer). LÄS MER

  4. 14. Is gear-based management of herbivorous fish a viable tool to prevent or reverse phase shifts in coral reefs? : Linking resilience theory to practice

    Master-uppsats, Stockholms universitet/Stockholm Resilience Centre

    Författare :Quentin Dilasser; [2011]
    Nyckelord :Coral reefs; resilience; gear-based management; herbivores; preventers and reversers; phase shifts; fisheries; Zanzibar;

    Sammanfattning : Herbivorous reef fish are a key functional group for the ecological resilience of coral reefs. Asthey feed on algae, a major resource competitor of coral polyps, they can prevent and reversecoral-macroalgal phase shifts. LÄS MER

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

    Kandidat-uppsats, Linköpings universitet/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