Browsing Articles by Author "Halvorsen, Kim Aleksander Tallaksen"

Now showing items 1-20 of 22

    • A contrastive learning approach for individual re-identification in a wild fish population 

      Olsen, Ørjan Langøy; Sørdalen, Tonje Knutsen; Goodwin, Morten; Malde, Ketil; Knausgård, Kristian Muri; Halvorsen, Kim Aleksander Tallaksen (Peer reviewed; Journal article, 2023)
      In both terrestrial and marine ecology, physical tagging is a frequently used method to study population dynamics and behavior. However, such tagging techniques are increasingly being replaced by individual re-identification ...

    • “A cleaner break”: Genetic divergence between geographic groups and sympatric phenotypes revealed in ballan wrasse (Labrus bergylta) 

      Seljestad, Gaute; Sanchez, Maria Quintela; Faust, Ellika; Halvorsen, Kim Aleksander Tallaksen; Besnier, Francois; Jansson, Eeva; Dahle, Geir; Knutsen, Halvor; André, Carl; Folkvord, Arild; Glover, Kevin (Peer reviewed; Journal article, 2020)
      Capture and long‐distance translocation of cleaner fish to control lice infestations on marine salmonid farms has the potential to influence wild populations via overexploitation in source regions, and introgression in ...

    • Cleaner fish escape salmon farms and hybridize with local wrasse populations 

      Faust, Ellika; Halvorsen, Kim Aleksander Tallaksen; Andersen, Per; Knutsen, Halvor; André, Carl (Journal article; Peer reviewed, 2018)
      The genetic impact of farmed fish escaping aquaculture is a highly debated issue. However, non-target species, such as cleaner fish used to remove sea lice from farmed fish, are rarely considered. Here, we report that wild ...

    • Genetic study reveals local differentiation persisting in the face of high connectivity and a genomic inversion likely linked with sexual antagonism in a common marine fish 

      Jansson, Eeva; André, Carl; Quintela, Maria; Halvorsen, Kim Aleksander Tallaksen; Besnier, Francois; Ayllon, Fernando; Faust, Ellika; Knutsen, Halvor; Strand, Åsa; Glover, Kevin Alan (Peer reviewed; Journal article, 2023)
      Sustainable harvest of wild populations requires knowledge of the underlying population structure. The focus of this study is on goldsinny wrasse (Ctenolabrus rupestris), a small marine fish inhabiting coastal waters of ...

    • Global, regional, and cryptic population structure in a high gene-flow transatlantic fish 

      Jansson, Eeva; Faust, Ellika; Bekkevold, Dorte; Quintela, Maria; Durif, Caroline; Halvorsen, Kim Aleksander Tallaksen; Dahle, Geir; Pampoulie, Christophe; Kennedy, James; Whittaker, Benjamin; Unneland, Laila; Post, Søren; André, Carl; Glover, Kevin Alan (Peer reviewed; Journal article, 2023)
      Lumpfish (Cyclopterus lumpus) is a transatlantic marine fish displaying large population sizes and a high potential for dispersal and gene-flow. These features are expected to result in weak population structure. Here, we ...

    • Goldsinny wrasse (Ctenolabrus rupestris) have a sex-dependent magnetic compass for maintaining site fidelity 

      Cresci, Alessandro; Larsen, Torkel; Halvorsen, Kim Aleksander Tallaksen; Durif, Caroline; Bjelland, Reidun Marie; Browman, Howard; Skiftesvik, Anne Berit (Peer reviewed; Journal article, 2021)
      The goldsinny wrasse (Ctenolabrus rupestris) is a commercially important fish that inhabits coastal areas across the eastern Atlantic. This species moves from a shallow home territory along the coast into deeper waters in ...

    • Harvesting changes mating behaviour in European lobster 

      Sørdalen, Tonje Knutsen; Halvorsen, Kim Aleksander Tallaksen; Harrison, Hugo B.; Ellis, Charlie D.; Vøllestad, Leif Asbjørn; Knutsen, Halvor; Moland, Even; Olsen, Esben Moland (Journal article; Peer reviewed, 2018)
      Removing individuals from a wild population can affect the availability of prospective mates and the outcome of competitive interactions, with subsequent effects on mating patterns and sexual selection. Consequently, the ...

    • Highly mixed impacts of near-future climate change on stock productivity proxies in the North East Atlantic 

      Kjesbu, Olav Sigurd; Sundby, Svein; Sandø, Anne Britt; Alix, Maud; Hjøllo, Solfrid Sætre; Tiedemann, Maik; Skern-Mauritzen, Mette; Junge, Claudia; Fossheim, Maria; Broms, Cecilie; Søvik, Guldborg; Zimmermann, Fabian; Nedreaas, Kjell Harald; Eriksen, Elena; Höffle, Hannes; Hjelset, Ann Merete; Kvamme, Cecilie; Reecht, Yves; Knutsen, Halvor; Aglen, Asgeir; Albert, Ole Thomas; Berg, Erik; Bogstad, Bjarte; Durif, Caroline; Halvorsen, Kim Aleksander Tallaksen; Høines, Åge Sigurd; Hvingel, Carsten; Johannesen, Edda; Johnsen, Espen; Moland, Even; Myksvoll, Mari Skuggedal; Nøttestad, Leif; Olsen, Erik Joel Steinar; Skaret, Georg; Skjæraasen, Jon Egil; Slotte, Aril; Staby, Arved; Stenevik, Erling Kåre; Stiansen, Jan Erik; Stiasny, Martina H.; Sundet, Jan Henry; Vikebø, Frode Bendiksen; Huse, Geir (Peer reviewed; Journal article, 2021)
      Impacts of climate change on ocean productivity sustaining world fisheries are predominantly negative but vary greatly among regions. We assessed how 39 fisheries resources—ranging from data-poor to data-rich stocks—in the ...

    • Lobster reserves as a management tool in coastal waters: Two decades of experience in Norway 

      Knutsen, Jan Atle; Kleiven, Alf Ring; Olsen, Esben Moland; Knutsen, Halvor; Espeland, Sigurd Heiberg; Sørdalen, Tonje Knutsen; Thorbjørnsen, Susanna Huneide; Hutchings, Jeffrey; Chacon, Albert Fernandez; Huserbråten, Mats Brockstedt Olsen; Villegas-Ríos, David; Halvorsen, Kim Aleksander Tallaksen; Kleiven, Portia Joy Nillos; Langeland, Thomas Kiland; Moland, Even (Peer reviewed; Journal article, 2022)
      The positive effects of reduced fishing pressure in marine protected areas (MPAs) are now well documented globally. Yet, evidence of MPA benefits from long-term replicated before-after control-impact (BACI) studies and ...

    • Marine protected areas rescue a sexually selected trait in European lobster 

      Sørdalen, Tonje Knutsen; Halvorsen, Kim Aleksander Tallaksen; Vøllestad, Leif Asbjørn; Moland, Even; Olsen, Esben Moland (Peer reviewed; Journal article, 2020)
      Marine protected areas (MPAs) are increasingly implemented worldwide to maintain and restore depleted populations. However, despite our knowledge on the myriad of positive responses to protection, there are few empirical ...

    • Marine protected areas rescue a sexually selected trait in European lobster 

      Sørdalen, Tonje Knutsen; Halvorsen, Kim Aleksander Tallaksen; Vøllestad, Leif Asbjørn; Moland, Even; Olsen, Esben Moland (Peer reviewed; Journal article, 2020)
      Marine protected areas (MPAs) are increasingly implemented worldwide to maintain and restore depleted populations. However, despite our knowledge on the myriad of positive responses to protection, there are few empirical ...

    • Mind the depth: The vertical dimension of a small-scale coastal fishery shapes selection on species, size, and sex in wrasses 

      Halvorsen, Kim Aleksander Tallaksen; Sørdalen, Tonje Knutsen; Larsen, Torkel; Browman, Howard; Rafoss, Trond; Albretsen, Jon; Skiftesvik, Anne Berit (Peer reviewed; Journal article, 2020)
      Small‐scale fisheries (SSFs) tend to target shallow waters, but the depth distributions of coastal fish can vary depending on species, size, and sex. This creates a scope for a form of fishing selectivity that has received ...

    • Movement patterns of temperate wrasses (Labridae) within a small marine protected area 

      Halvorsen, Kim Aleksander Tallaksen; Larsen, Torkel; Browman, Howard; Durif, Caroline; Aasen, Nicolai; Vøllestad, Leif Asbjørn; Cresci, Alessandro; Sørdalen, Tonje Knutsen; Bjelland, Reidun Marie; Skiftesvik, Anne Berit (Peer reviewed; Journal article, 2021)
      The movement patterns of three commercially important wrasse (Labridae) species inside a small marine protected area (~ 0.15 km2) on the west coast of Norway were analysed over a period of 21 months. The mean distance ...

    • Movement patterns of temperate wrasses (Labridae) within a small marine protected area 

      Halvorsen, Kim Aleksander Tallaksen; Larsen, Torkel; Browman, Howard; Durif, Caroline; Aasen, Nicolai; Vøllestad, Leif Asbjørn; Cresci, Alessandro; Sørdalen, Tonje Knutsen; Bjelland, Reidun Marie; Skiftesvik, Anne Berit (Peer reviewed; Journal article, 2021)
      The movement patterns of three commercially important wrasse (Labridae) species inside a small marine protected area (~ 0.15 km2) on the west coast of Norway were analysed over a period of 21 months. The mean distance ...

    • Not that clean: Aquaculture-mediated translocation of cleaner fish has led to hybridization on the northern edge of the species' range 

      Faust, Ellika; Jansson, Eeva; André, Carl; Halvorsen, Kim Aleksander Tallaksen; Dahle, Geir; Knutsen, Halvor; Sanchez, Maria Quintela; Glover, Kevin Alan (Peer reviewed; Journal article, 2021)
      Translocation and introduction of non-native organisms can have major impacts on local populations and ecosystems. Nevertheless, translocations are common practices in agri- and aquaculture. Each year, millions of wild-caught ...

    • Potential for managing life history diversity in a commercially exploited intermediate predator, the goldsinny wrasse (Ctenolabrus rupestris) 

      Olsen, Esben Moland; Halvorsen, Kim Aleksander Tallaksen; Larsen, Torkel; Kuparinen, Anna (Peer reviewed; Journal article, 2019)

    • Protection from fishing improves body growth of an exploited species 

      Sørdalen, Tonje Knutsen; Halvorsen, Kim Aleksander Tallaksen; Olsen, Esben Moland (Peer reviewed; Journal article, 2022)
      Hunting and fishing are often size-selective, which favours slow body growth. In addition, fast growth rate has been shown to be positively correlated with behavioural traits that increase encounter rates and catchability ...

    • Protection from fishing improves body growth of an exploited species 

      Sørdalen, Tonje Knutsen; Halvorsen, Kim Aleksander Tallaksen; Olsen, Esben Moland (Peer reviewed; Journal article, 2022)
      Hunting and fishing are often size-selective, which favours slow body growth. In addition, fast growth rate has been shown to be positively correlated with behavioural traits that increase encounter rates and catchability ...

    • Restoration of Abundance and Dynamics of Coastal Fish and Lobster Within Northern Marine Protected Areas Across Two Decades 

      Moland, Even; Fernández-Chacón, Albert; Sørdalen, Tonje Knutsen; Villegas-Rios, David; Thorbjørnsen, Susanna Huneide; Halvorsen, Kim Aleksander Tallaksen; Huserbråten, Mats Brockstedt Olsen; Olsen, Esben Moland; Kleiven, Portia Joy Nillos; Kleiven, Alf Ring; Knutsen, Halvor; Espeland, Sigurd Heiberg; Freitas, Carla; Knutsen, Jan Atle (Peer reviewed; Journal article, 2021)
      This article reviews a suite of studies conducted in a network of coastal Marine Protected Areas (MPAs) in Skagerrak, Southeast Norway. In 2006, Norway’s first lobster reserves were implemented, with the aim of protecting ...

    • Temperate fish detection and classification: a deep learning based approach 

      Knausgård, Kristian Muri; Wiklund, Arne; Sørdalen, Tonje Knutsen; Halvorsen, Kim Aleksander Tallaksen; Kleiven, Alf Ring; Lei, Jiao; Goodwin, Morten (Peer reviewed; Journal article, 2021)
      A wide range of applications in marine ecology extensively uses underwater cameras. Still, to efficiently process the vast amount of data generated, we need to develop tools that can automatically detect and recognize ...