Blar i forfatter "Alvestad, Anja Helene"

Viser treff 1-4 av 4

    • Alternative materialer til plast brukt i snurrevadtau og trålmatter 

      Alvestad, Anja Helene; Grimaldo, Eduardo; Lilleng, Grethe; Syversen, Tore; Vollstad, Jørgen; Johnsen, Hilde Rødås (Research report; Forskningsrapport, 2023-10-30)
      Dette prosjektet studerte ulike løsninger for å redusere effekten av slitasje fra fossilbasert, ikke-nedbrytbare plastmaterialer som brukes i snurrevad og trålmatter. Prosjektet testet ulike natur-, syntetiske og biologisk nedbrytbare materialer i laboratorium og i felt. Prosjektet kvantifiserte og sannsynliggjorde hvor mye reduksjon i utslipp ulike tiltak og løsninger kan bidra med. Det inkluderes ...

    • Gyrodactylus triglopsi n. sp. (Monogenea: Gyrodactylidae) from the Gills of Triglops nybelini Jensen, 1944 (Teleostei: Cottidae) in the Barents Sea 

      Hansen, Haakon; Alvestad, Anja Helene; MacKenzie, Ken; Darrud, Mari; Karlsbakk, Egil; Hemmingsen, Willy; Arneberg, Per (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-28)
      <i>Introduction</i> - Monogeneans of the genus <i>Gyrodactylus</i> were found on the gills of specimens of the bigeye sculpin <i>Triglops nybelini</i> Jensen, 1944 caught by trawl in the Barents Sea in January–February 2016.<p> <p><i>Methods</i> - Morphological preparations of the parasites were examined and photographed under a microscope at magnifcations of×100–1000 and morphometric analyses ...

    • Parasites of Northeast Arctic cod (Gadus morhua) in the Barents Sea: effects on reproduction 

      Alvestad, Anja Helene (Master thesis; Mastergradsoppgave, 2017-07-15)
      Parasites play a key role in the biodiversity and dynamics of an ecosystem, either by affecting host mortality and/or host reproduction. Spawning comes with a great cost in time and energy, and in times of poor conditions this time and energy is better directed into growth and survival to increase future success. The phenomenon of skipped spawning, where sexually mature fish skip a reproductive ...

    • Reducing plastic pollution caused by demersal fisheries 

      Grimaldo, Eduardo; Karl, Christian; Alvestad, Anja Helene; Persson, Anna-Maria Märta Ruth; Kubowicz, Stephan; Olafsen, Kjell; Hatlebrekke, Hanne Hjelle; Lilleng, Grethe; Brinkhof, Ilmar Leone (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-07)
      Marine microplastics generated by wear and tear of bottom trawls and demersal seines during their service life is a growing environmental concern that requires immediate attention. In Norway, these fishing gears account for more than 70 % of the landings of demersal fish species, but they are also the leading sources of microplastics generated by fisheries. Because these two fishing gears are widely ...