HAVBRUKS-Havbruk - en næring i vekst

Johansson. D, Laursen, F., Fernö A., Fosseidengen, J-E., Klebert, P., Stien, L. H., Vågseth T. & Oppedal, F. Water current: a directive factor for atlantic salmon (Salmo salar L.) behaviour in sea cages. Presentation at EAS 2013 at Trondheim. Laursen, F., Johansson, D., Olsen, R-E., Oppedal, F & Fernö, A. Effect of water currents on postsmolt atlantic salmon (Salmo salar L.) Presentation at EAS 2013 at Trondheim. Oppedal, F., Johansson, D., Laursen, F., Remen, M., Folkedal, O., Nilsson, J., Gansel, L., Korsøen, Ø., Dempster, T., Stien, L.H., 2014. Responses of caged salmon to farm environment. WAS 2014, Adelaide, Australia, 8-12 June 2014. Johansson. D, Laursen, F., Fernö A., Fosseidengen, J-E., Klebert, P., Stien, L. H., Vågseth T. Oppedal, F., 2013. Water current: a directive factor for Atlantic salmon (Salmo salar L.) behaviour in sea cages. Aquaculture Europe 13, August 10, Trondheim. Johansson, D., Laursen, F., Fernö, A., Fosseidengen, J.E., Klebert, P., Stien, L., Vågseth, T., Oppedal, F., 2014. Vannström: hvordan påverkar den laksoppdrett på sjøen? Programkonferansen Havbruk 2014, Forskningsrådet, Tromsø, 31/3-2/4 2014. Laursen, F., Johansson, D., Oppedal, F., Fernö, A., Fraser, T.W.K., Olsen, R.E., 2014. Effect of water currents on postsmolt Atlantic salmon (Salmo salar). Programkonferansen Havbruk 2014, Forskningsrådet, 31/3-2/4 2014. Laursen, F., Johansson, D., Olsen, R-E., Oppedal, F., Fernö, A., 2013. Effect of water currents on postsmolt Atlantic salmon (Salmo salar L.). Aquaculture Europe 13, August 10, Trondheim. Samsing, F., Oppedal, F., Johansson, D., Dempster, T., 2014. Go with the flow: Manipulating flow hydrodynamics to reduce infestation levels with sea lice Lepeophtheirus salmonis in farmed Atlantic salmon, WAS 2014, Adelaide, Australia, 8-12 June 2014. Oppedal, F., Gansel., L, 2014. Pushing cages allows field investigations under controlled flow conditions, WAS 2014, Adelaide, Australia, 8-12 June 2014. Gansel, L., Oppedal, F., 2014. Drag og deformasjon på oppdrettsmerder i sjøen. Programkonferansen Havbruk 2014, Forskningsrådet, Tromsø, 31/3-2/4 2014. Klebert P., Andresen P. C., Rundtop P., Patursson O, Rasmussen H., Johansson D , Oppedal F., (2014). Deformation of a large fish cage in high. World Aquaculture Society (WAS) 2014 7-11 June Adelaide, Australia. Klebert P., Lader P., Enerhaug B and Patursson Ø, (2014), Submerged flexible circular porous structures in currents and waves. Proceedings of the HYDRALAB IV Joint User Meeting, Lisbon, July 2014.

The Norwegian salmon aquaculture industry has developed towards using more exposed, high-energy sites to obtain better access to high water quality. High current sites may lead to improved production due to high water quality and rates of exchange and sim ultaneously reduce ecological effects on the sea floor through better waste dispersion. While beneficial, high currents and high waves may challenge both salmon and sea-cage technologies. Deformation of the cage net in high currents may reduce the availab le culture volume, forcing fish into higher densities and thus causing stress. In addition, salmon may have to swim against high currents which may lead to high energy use and exhaustion at extreme levels. Establishing knowledge regarding the limits of sa lmon and performance of technologies in high currents will enable improvements to farms at exposed locations. Knowledge will be developed through three connected work packages (WPs) to improve salmon farming in high-energy sites. WP1 focuses on fish behav ior and physiology and will define current and wave conditions beyond which production efficiency diminishes and the upper operational limits for which fish farming in exposed areas is possible. WP 2 will determine the hydrodynamics inside the cage, throu gh laboratory and field experiments, and acquire knowledge on how current speed and wave height and frequency modify flows in cages and thereby affect fish behavior. WP3 will develop a common model for both fish behaviour and hydrodynamics inside cages. T he model will use a new numerical method, which is currently being developed at SINTEF Fisheries and Aquaculture. Model validation will be done using results from WPs 1 and 2. We foresee that the results of the project will enable the Norwegian aquacultur e industry to better use high current sites; the results will add value through ensuring acceptable fish welfare standards, improved farm management and operational efficiencies.