Browsing Brage IMR by Author "Johansson, David"
Now showing items 1-6 of 6
-
Fluctuating sea-cage environments modify the effects of stocking densities on production and welfare parameters of Atlantic salmon (Salmo salar L.)
Oppedal, Frode; Vågseth, Tone; Dempster, Tim; Juell, Jon-Erik; Johansson, David (Journal article; Peer reviewed, 2011-05-21)Stocking densities are commonly used to set limits for the production of fish in sea-cages, yet limited information exists to assess how environmental fluctuations modify the effects of stocking densities on the production ... -
Fluctuating sea-cage environments modify the effects of stocking densities on production and welfare parameters of Atlantic salmon (Salmo salar L.)
Oppedal, Frode; Vågseth, Tone; Dempster, Tim; Juell, Jon-Erik; Johansson, David (Journal article; Peer reviewed, 2011-05-21)Stocking densities are commonly used to set limits for the production of fish in sea-cages, yet limited information exists to assess how environmental fluctuations modify the effects of stocking densities on the production ... -
High host densities dilute sea lice Lepeophtheirus salmonis loads on individual Atlantic salmon, but do not reduce lice infection success
Samsing, Francisca; Oppedal, Frode; Johansson, David; Bui, Samantha; Dempster, Tim (Journal article; Peer reviewed, 2014-12-02)Host density likely plays a key role in host−parasite interactions, but empirical evidence in marine ecosystems remains limited. Classical models predict a positive relationship between host density and parasite infection ... -
High host densities dilute sea lice Lepeophtheirus salmonis loads on individual Atlantic salmon, but do not reduce lice infection success
Samsing, Francisca; Oppedal, Frode; Johansson, David; Bui, Samantha; Dempster, Timothy David (Peer reviewed; Journal article, 2014) -
Merd-miljø og fiskevelferd i lakseproduksjon på kyst- og fjordlokaliteter på Vestlandet
Johansson, David; Juell, Jon-Erik; Oppedal, Frode; Stiansen, Jan Erik; Fosseidengen, Jan Erik (Fisken og havet, Research report, 2004)This survey give detailed information about the complex variation of the physical, biological and chemical variation in environment at typical fjord and coastal farming sites in the autumn. Large variations with depth and ... -
The interaction between water currents and salmon swimming behaviour in sea cages
Johansson, David; Laursen, Frida; Fernö, Anders; Fosseidengen, Jan Erik; Klebert, Pascal; Stien, Lars Helge; Vagseth, Tone; Oppedal, Frode (Journal article; Peer reviewed, 2014-05-15)Positioning of sea cages at sites with high water current velocities expose the fish to a largely unknown environmental challenge. In this study we observed the swimming behaviour of Atlantic salmon (Salmo salar L.) at a ...