Browsing Publikasjoner fra CRIStin by Author "Dempster, Tim"

Now showing items 1-15 of 15

    • A metapopulation model reveals connectivity-driven hotspots in treatment resistance evolution in a marine parasite 

      Coates, Andrew; Robinson, Nicholas Andrew; Dempster, Tim; Samsing, Francisca; Johnsen, Ingrid Askeland; Phillips, Ben L. (Peer reviewed; Journal article, 2022)
      In salmon aquaculture, the sustainable management of salmon lice (Lepeophtheirus salmonis) is limited by the adaptive capacity of the parasite. This is evident in the repeated evolution of pesticide resistance in the salmon ...

    • Applying genetic technologies to combat infectious diseases in aquaculture 

      Robinson, Nicholas Andrew; Robledo, Diego; Sveen, Lene; Daniels, Rose Ruiz; Krasnov, Aleksei; Coates, Andrew; Jin, Ye Hwa; Barrett, Luke T.; Lillehammer, Marie; Kettunen, Anne Helena; Phillips, Ben L.; Dempster, Tim; Doeschl-Wilson, Andrea; Samsing, Francisca; Difford, Gareth Frank; Salisbury, Sarah; Gjerde, Bjarne; Haugen, John-Erik; Burgerhout, Erik; Dagnachew, Binyam Sime; Kurian, Dominic; Fast, Mark D.; Rye, Morten; Salazar, Marcela; Bron, James E.; Monaghan, Sean J.; Jacq, Celeste; Birkett, Mike; Browman, Howard I.; Skiftesvik, Anne Berit; Fields, David M.; Selander, Erik; Bui, Samantha; Sonesson, Anna Kristina; Skugor, Stanko; Østbye, Tone-Kari K; Houston, Ross D. (Peer reviewed; Journal article, 2022)
      Disease and parasitism cause major welfare, environmental and economic concerns for global aquaculture. In this review, we examine the status and potential of technologies that exploit genetic variation in host resistance ...

    • Aquaculture-derived trophic subsidy boosts populations of an ecosystem engineer 

      White, Camille; Bannister, Raymond; Dworjanyn, Simon; Husa, Vivian; Nichols, Peter D.; Dempster, Tim (Journal article; Peer reviewed, 2018)
      Environmental management of coastal aquaculture is focused on acute impacts of organic and nitrogenous wastes close to farms. However, the energy-rich trophic subsidy that aquaculture provides may create cascades with ...

    • Cyclic hypoxia exposure accelerates the progression of amoebic gill disease 

      Oldham, Tina Marie Wier; Dempster, Tim; Crosbie, Phil; Adams, Mark; Nowak, Barbara (Peer reviewed; Journal article, 2020)
      Amoebic gill disease (AGD), caused by the amoeba Neoparamoeba perurans, has led to considerable economic losses in every major Atlantic salmon producing country, and is increasing in frequency. The most serious infections ...

    • Efficacy of salmon lice prevention via snorkel technology depends upon salinity at the farm site, with minimal effects on salmon production and welfare 

      Oppedal, Frode; Bui, Samantha; Overton, Kathy; Stien, Lars Helge; Dempster, Tim (Journal article; Peer reviewed, 2019)
      Sea lice are a critical health issue in most salmonid farming regions. New cage-based technologies can prevent infestations from occurring, such as the ‘snorkel’, which introduces an impermeable barrier that separates ...

    • Evolutionary predictions for a parasite metapopulation: Modelling salmon louse resistance to pest controls in aquaculture 

      Coates, Andrew; Robinson, Nicholas Andrew; Dempster, Tim; Johnsen, Ingrid Askeland; Phillips, Ben L. (Peer reviewed; Journal article, 2023)
      Pests often evolve resistance to pest controls used in agriculture and aquaculture. The rate of pest adaptation is influenced by the type of control, the selective pressure it imposes, and the gene flow between farms. By ...

    • Farmed salmonids drive the abundance, ecology and evolution of parasitic salmon lice in Norway 

      Dempster, Tim; Overton, Kathy; Bui, Samantha; Stien, Lars Helge; Oppedal, Frode; Karlsen, Ørjan; Coates, Andrew; Phillips, B. L.; Barrett, Luke T. (Peer reviewed; Journal article, 2021)
      Sea cage fish farming is typically open to the environment, with disease transmission possible between farmed and wild hosts. In salmonid aquaculture, salmon louse Lepeophtheirus salmonis infestations cause production ...

    • Full production cycle, commercial scale culture of salmon in submerged sea-cages with air domes reduces lice infestation, but creates production and welfare challenges 

      Warren-Myers, Fletcher; Vågseth, Tone; Folkedal, Ole; Stien, Lars Helge; Fosse, Jan Olav; Dempster, Tim; Oppedal, Frode (Peer reviewed; Journal article, 2021)
      Structural modification of sea cages is continually changing to counter major production issues associated with commercial salmon farming. For example, snorkels and skirts are added to cages to reduce salmon lice infestations, ...

    • In situ sea lice egg sterilization with UVC light 

      Bui, Samantha; Oppedal, Frode; Barrett, Luke; Dempster, Tim; Pert, Cassie (Rapport fra havforskningen;2019 - 29, Research report, 2019)
      Sea-cage salmon farming creates ideal conditions for population growth of the salmon louse Lepeophtheirus salmonis, potentially leading to poor welfare and mortality in farmed salmon and nearby wild salmonids. Frequent ...

    • Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar 

      Oldham, Tina; Dempster, Tim; Fosse, Jan Olav; Oppedal, Frode (Peer reviewed; Journal article, 2017)
      Dissolved oxygen (DO) conditions in marine aquaculture cages are heterogeneous and fluctuate rapidly. Here, by temporarily wrapping a tarpaulin around the top 0 to 6 m of a marine cage (~2000 m3), we manipulated DO to ...

    • Prevention not cure: a review of methods to avoid sea lice infestations in salmon 1 aquaculture 

      Barrett, Luke T.; Oppedal, Frode; Robinson, Nicholas Andrew; Dempster, Tim (Peer reviewed; Journal article, 2020)
      The Atlantic salmon aquaculture industry still struggles with ectoparasitic sea lice despite decades of research and development invested into louse removal methods. In contrast, methods to prevent infestations before they ...

    • Salmon lice treatments and salmon mortality in Norwegian aquaculture: a review 

      Overton, Kathy; Dempster, Tim; Oppedal, Frode; Kristiansen, Tore S; Gismervik, Kristine; Stien, Lars Helge (Journal article; Peer reviewed, 2018)
      With the expansion of Atlantic salmon aquaculture, the economic and ecological impacts of salmon lice (Lepeophtheirus salmonis) has increased. Norway battles this problematic parasite with various control and preventative ...

    • Sentinels in Salmon Aquaculture: Heart Rates Across Seasons and During Crowding Events 

      Warren-Myers, Fletcher; Hvas, Malthe; Vågseth, Tone; Dempster, Tim; Oppedal, Frode (Peer reviewed; Journal article, 2021)
      Advances in tag technology now make it possible to monitor the behavior of small groups of individual fish as bioindicators of population wellbeing in commercial aquaculture settings. For example, tags may detect unusual ...

    • Submerged cage aquaculture of marine fish: a review of the biological challenges and opportunities 

      Sievers, Michael; Korsøen, Øyvind Johan; Warren-Myers, Fletcher; Oppedal, Frode; Macauley, Georgia; Folkedal, Ole; Dempster, Tim (Peer reviewed; Journal article, 2021)
      Surface-based cages are the dominant production technology for the marine finfish aquaculture industry. However, issues such as extreme weather events, poor environmental conditions, interactions with parasites, and conflicts ...

    • Tag use to monitor fish behaviour in aquaculture: a review of benefits, problems and solutions 

      Macaulay, Georgia; Warren-Myers, Fletcher; Barrett, Luke T.; Oppedal, Frode; Føre, Martin; Dempster, Tim (Peer reviewed; Journal article, 2021)
      A variety of tagging techniques are now available to monitor fish behaviour, physiology and their environmental experience. Tagging is frequently used in aquaculture research to monitor free-swimming individuals within ...