Browsing Brage IMR by Author "Wright, Daniel William"
Now showing items 1-16 of 16
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Atlantic salmon Salmo salar instantaneously follow vertical light movements in sea cages
Wright, Daniel William; Glaropoulos, Alexis; Solstorm, David; Stien, Lars Helge; Oppedal, Frode (Journal article; Peer reviewed, 2015)Atlantic salmon in marine farming environments are exposed to potentially detrimental conditions through space and time. For instance, the vertical distribution of parasitic salmon lice larvae shifts in response to changing ... -
Avlusing med kaldt vann? – effektivitet og laksens velferd — sluttrapport FHF prosjekt 901488
Oppedal, Frode; Stien, Lars Helge; Wright, Daniel William; Moltumyr, Lene; Nilsson, Jonatan; Dempster, Timothy David; Overton, Kathy (Rapport fra havforskningen, Research report, 2019)Termisk behandling av oppdrettslaks med varmt vann blir hyppig brukt av næringen som avlusingsmetode. Behandlingen rapporteres å fjerne mobile lus effektivt, men kan også føre til dårligere fiskevelferd og økt dødelighet. ... -
Cleaner fish growth, welfare and survival in Atlantic salmon sea cages during an autumn-winter production
Geitung, Lena; Wright, Daniel William; Oppedal, Frode; Stien, Lars Helge; Vågseth, Tone; Madaro, Angelico (Peer reviewed; Journal article, 2020)Cleaner fish used as a biological control agent against salmon lice is rapidly increasing in Atlantic salmon aquaculture. However, concerns have been raised about the welfare and mortality of cleaner fish in salmon cage ... -
Differential effects of internal tagging depending on depth treatment in Atlantic salmon: a cautionary tale for aquatic animal tag use.
Wright, Daniel William; Stien, Lars Helge; Dempster, Timothy David; Oppedal, Frode (Journal article; Peer reviewed, 2019)Electronic tags are widespread tools for studying aquatic animal behavior; however, tags risk behavioral manipulation and negative welfare outcomes. During an experiment to test behavioral differences of Atlantic salmon ... -
The effectiveness of hyposaline treatments against host-attached salmon lice
Sievers, Michael; Oppedal, Frode; Ditria, Ellen; Wright, Daniel William (Peer reviewed; Journal article, 2019)Understanding how salinity affects marine parasites is vital to understanding their ecology and treatment, particularly for host-parasite systems that traverse marine and freshwater realms such as the globally important ... -
Effects of step salinity gradients on salmon lice larvae behaviour and dispersal
Crosbie, Thomas; Wright, Daniel William; Oppedal, Frode; Johnsen, Ingrid Askeland; Samsing, Fransisca; Dempster, Timothy (Peer reviewed; Journal article, 2019)In trying to deal with the problematic salmon louse Lepeophtheirus salmonis in salmon aquaculture, strategies to better prevent infestations are gaining traction. Successful prevention requires an accurate understanding ... -
Free-living Neoparamoeba perurans depth distribution is mostly uniform in salmon cages, but reshaped by stratification and potentially extreme fish crowding
Wright, Daniel William; Nowak, Barbara; Oppedal, Frode; Bridle, Andrew; Dempster, Timothy David (Peer reviewed; Journal article, 2017)Understanding the spatio-temporal positioning of hosts and their parasites in free-living states is useful in devising methods to diminish parasite encounters in animal production systems. We explored the potential for ... -
Impact of thermoclines on the vertical distribution of salmon lice larvae
Crosbie, Thomas; Wright, Daniel William; Oppedal, Frode; Dalvin, Sussie; Myksvoll, Mari Skuggedal; Dempster, Timothy (Peer reviewed; Journal article, 2020)Salmon louse Lepeophtheirus salmonis, a key parasite of salmonids, is managed by multiple methods at both salmon farm- and ecosystem-scale that are informed by an understanding of the abundance and distribution of the ... -
Salmon lice nauplii and copepodids display different vertical migration patterns in response to light
Szetey, Aylah; Wright, Daniel William; Oppedal, Frode; Dempster, Timothy David (Peer reviewed; Journal article, 2021)Light is a fundamental environmental cue which influences the migration of many marine organisms. For the salmon louse Lepeophtheirus salmonis, light is believed to drive the diel vertical migration behaviour of their ... -
Salmon lice threaten growth, osmoregulation and survival in anadromous Arctic char post-smolts
Fjelldal, Per Gunnar; Hansen, Tom Johnny; Karlsen, Ørjan; Wright, Daniel William (Peer reviewed; Journal article, 2019)High salmon lice (Lepeophtheirus salmonis) infestation levels resulting from intensive salmonid sea-cage aquaculture can threaten populations of wild salmonid hosts. This includes anadromous Arctic char (Salvelinus alpinus), ... -
Snorkel sea-cage technology decreases salmon louse infestation by 75% in a full-cycle commercial test
Geitung, Lena; Oppedal, Frode; Stien, Lars Helge; Dempster, Timothy David; Karlsbakk, Egil; Nola, Velimir; Wright, Daniel William (Journal article; Peer reviewed, 2019)Methods to prevent parasite infestations in farmed fish are becoming widespread, yet tests of their effectiveness often lack commercial relevance and statistical power, which may lead to technology misuse. Here, we examined ... -
Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare
Wright, Daniel William; Geitung, Lena; Karlsbakk, Egil; Stien, Lars Helge; Dempster, Timothy David; Oldham, Tina; Nola, Velimir; Oppedal, Frode (Journal article; Peer reviewed, 2018)Surface environment modification is a potential parasite control strategy in Atlantic salmon sea-cage farming. For instance, a temporary low salinity surface layer in commercial-scale snorkel sea-cages has coincided with ... -
Tapeworm (Eubothrium sp.) infestation in sea caged Atlantic salmon decreased by lice barrier snorkels during a commercial-scale study
Geitung, Lena; Wright, Daniel William; Stien, Lars Helge; Oppedal, Frode; Karlsbakk, Egil Erlingsson (Peer reviewed; Journal article, 2021)Reports of infestation by marine parasitic tapeworms (Eubothrium sp.) and an associated growth reduction in Norwegian farmed salmon are on the rise. With few acceptable treatment options available, due to drug resistance ... -
The gill parasite Paramoeba perurans compromises aerobic scope, swimming capacity and ion balance in Atlantic salmon.
Hvas, Malthe; Karlsbakk, Egil; Mæhle, Stig; Wright, Daniel William; Oppedal, Frode (Journal article; Peer reviewed, 2017)The parasitic amoeba Paramoeba perurans is an aetiological agent of amoebic gill disease (AGD), a serious problem in seawater salmonid aquaculture globally. Other finfish species are also infected and infection events may ... -
The Well – Mixing skirt and freshwater lens concepts with smart-lighting and -feeding to enhance lice prevention and safeguard fish welfare
Wright, Daniel William; Stien, Lars Helge; Oppedal, Frode; Sievers, Michael; Ditria, Ellen; Trengereid, Henrik (Rapport fra havforskningen, Research report, 2019)A commercial scale sea-cage design, combining skirt and freshwater lens concepts with smart lighting and feeding for improved lice prevention and fish welfare, was trialed. Environment, lice levels and fish welfare were ... -
Velferdsindikatorer for oppdrettslaks: Hvordan vurdere og dokumentere fiskevelferd - Del B. Bruk av operative velferdsindikatorer for ulike oppdretts- og produksjonssystem
Kolarevic, Jelena; Stien, Lars Helge; Espmark, Åsa Maria Olofsdotter; Gomez, David Izquierdo; Sæther, Bjørn-Steinar; Nilsson, Jonatan; Oppedal, Frode; Wright, Daniel William; Nielsen, Kristoffer Vale; Gismervik, Kristine; Iversen, Martin Haugmo; Noble, Chris (Others, 2017)