Browsing Published externally by Author "Albretsen, Jon"
Now showing items 21-40 of 57
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Impact of variable physical conditions and future increased aquaculture production on lice infestation pressure and its sustainability in Norway
Myksvoll, Mari Skuggedal; Sandvik, Anne Dagrun; Johnsen, Ingrid A.; Skardhamar, Jofrid; Albretsen, Jon (Peer reviewed; Journal article, 2020)Salmon lice infestation is a challenge for wild post-smolt salmon during migration from their natal river to the sea in several regions of Norway. The traffic-light management system regulates growth in the aquaculture ... -
Impact of variable physical conditions and future increased aquaculture production on lice infestation pressure and its sustainability in Norway
Myksvoll, Mari Skuggedal; Sandvik, Anne Dagrun; Johnsen, Ingrid Askeland; Skardhamar, Jofrid; Albretsen, Jon (Peer reviewed; Journal article, 2020)Salmon lice infestation is a challenge for wild post-smolt salmon during migration from their natal river to the sea in several regions of Norway. The traffic-light management system regulates growth in the aquaculture ... -
Impacts of salmon lice on mortality, marine migration distance and premature return in sea trout
Serra Llinares, Rosa Maria; Bøhn, Thomas; Karlsen, Ørjan; Nilsen, Rune; Freitas, Carla; Albretsen, Jon; Haraldstad, Tormod; Thorstad, Eva Bonsak; Elvik, Kristine Marit Schrøder; Bjørn, Pål Arne (Peer reviewed; Journal article, 2020)Brown trout Salmo trutta (L.) is a facultative anadromous species, where a portion of individuals in populations with access to the sea perform migrations to use the richer feeding resources. We investigated the effect of ... -
Implementation and evaluation of open boundary conditions for sea ice in a regional coupled ocean (ROMS) and sea ice (CICE) modeling system
Duarte, Pedro; Brændshøi, Jostein; Shcherbin, Dmitry; Barras, Pauline; Albretsen, Jon; Gusdal, Yvonne; Szapiro, Nicholas; Martinsen, Andreas Rostrup; Samuelsen, Annette; Wang, Keguang; Debernard, Jens Boldingh (Peer reviewed; Journal article, 2022)The Los Alamos Sea Ice Model (CICE) is used by several Earth system models where sea ice boundary conditions are not necessary, given their global scope. However, regional and local implementations of sea ice models require ... -
Kartfesting og klassifisering av marin natur på Svalbard – et prosjekt for Svalbards miljøvernfond
Bekkby, Trine; Albretsen, Jon; Kuipers, Boele; Renaud, Paul Eric; Gundersen, Hege; Włodarska-Kowalczuk, M (Research report, 2017)Dette prosjektet har hatt som mål å integrere, modellere og tilgjengeliggjøre marine grunnkart for Svalbard. Dyp, strøm, saltholdighet, temperatur, ulike terrengforhold (inkl. skråning, bassenger) og områder med skred og ... -
Lemon sole Microstomus kitt in the northern North Sea: a multidisciplinary approach to the early life-history dynamics
Geffen, Audrey J.; Albretsen, Jon; Huwer, Bastian; Nash, Richard David Marriott (Peer reviewed; Journal article, 2021)Lemon sole Microstomus kitt is a commercially valuable flatfish species that occurs in shelf waters around the northeast Atlantic. Only the most basic life-history information is available for the North Sea. Spawning is ... -
Linking bacterial community structure to advection and environmental impact along a coast-fjord gradient of the Sognefjord, western Norway
Storesund, Julia Endresen; Sandaa, Ruth-Anne; Thingstad, T. Frede; Asplin, Lars; Albretsen, Jon; Erga, Svein Rune (Peer reviewed; Journal article, 2017) -
Marine naturverdier i Telemark – status, trusler og muligheter. Innspill til kystsoneplan for Telemark.
Rinde, Eli; Olsen, Marianne; Steen, Henning; Dahl, Einar; Espeland, Sigurd Heiberg; Albretsen, Jon (NIVA-rapport, Research report, 2018)Denne rapporten er skrevet på oppdrag for Telemark fylkeskommune. Rapporten gir en kunnskapsstatus over forekomst og utbredelse av marine naturverdier, deres tilstand og hvilke kjente trusler disse er utsatt for med hensyn ... -
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 ... -
Modeling key processes affecting Al speciation and transport in estuaries
Simonsen, Magne; Teien, Hans-Christian; Lind, Ole Christian; Sætra, Øyvind; Albretsen, Jon; Salbu, Brit (Journal article; Peer reviewed, 2019)Assessments of the impacts of aluminium (Al) to aquatic organisms in estuarine waters have suffered from the lack of available models that can accurately predict the presence of toxic physico-chemical forms (species) of ... -
Modeling the Distribution of Habitat-Forming, Deep-Sea Sponges in the Barents Sea: The Value of Data
Gonzalez-Mirelis, Genoveva; Ross, Rebecca; Albretsen, Jon; Buhl-Mortensen, Pål (Peer reviewed; Journal article, 2021)The use of species occurrence as a proxy for habitat type is widespread, probably because it allows the use of species distribution modeling (SDM) to cost-effectively map the distribution of e.g., vulnerable marine ecosystems. ... -
Modelled salmon lice dispersion and infestation patterns in a sub-arctic fjord
Skardhamar, Jofrid; Albretsen, Jon; Sandvik, Anne Dagrun; Lien, Vidar Surén; Myksvoll, Mari Skuggedal; Johnsen, Ingrid Askeland; Asplin, Lars; Ådlandsvik, Bjørn; Halttunen, Elina; Bjørn, Pål Arne (Journal article; Peer reviewed, 2018)Salmon lice infestation is a major challenge for the aquaculture industry in Norway, threatening wild salmonid populations and causing welfare problems for farmed salmon. Lice dispersion and infestation patterns are simulated ... -
Modelling drift of pelagic offspring: the importance of egg surveys in providing a realistic model initialization.
Espeland, Sigurd Heiberg; Albretsen, Jon; Olsen, Esben Moland; Bodvin, Torjan (Journal article; Peer reviewed, 2015-07-11)Having valid information about the location and dynamics of biological processes is important for coastal management. In this context modelling, the pelagic drift of early life stages has been shown to be an important tool ... -
Modelling of the Svalbard fjord Hornsund
Jakacki, Jaromir; Przyborska, Anna; Kosecki, Szymon; Sundfjord, Arild; Albretsen, Jon (Peer reviewed; Journal article, 2017) -
Mulighetskartlegging for kystbaserte næringer i Østfold
Kaste, Øyvind; Dahl, Einar; Gaeta, Federico Håland; Hess-Erga, Ole-Kristian; Johnsen, Kathrine Ivsett; Kildahl, Henriette Othilie Bøe; Steen, Henning; Albretsen, Jon (NIVA-rapport, Research report, 2020)En rekke utredninger og strategidokumenter, både på internasjonalt og nasjonalt nivå, peker på at det er et stort potensial for økt vekst og verdiskaping knyttet til marine næringer. Viken fylkeskommune og kommunene langs ... -
New validation method for hydrodynamic fjord models applied in the Hardangerfjord, Norway
Dalsøren, Stig B.; Albretsen, Jon; Asplin, Lars (Peer reviewed; Journal article, 2020)We introduce a new intuitive evaluation method for comparison of fjord model results and current measurements. The approach is tested using high resolution model simulations and measurements in the Hardangerfjord, a large ... -
Of three sharks and one chimaera: varied habitat preferences across a latitudinal range revealed by coastal and offshore surveys
Jac, Romaric; Höffle, Hannes; Albretsen, Jon; Jakobsdottir, Klara; Staby, Arved; Søvik, Guldborg; Junge, Claudia (Peer reviewed; Journal article, 2021)Using national and international research survey data and applying a combination of models and mapping tools, this study revealed temperature and depth as the crucial environmental drivers of both the distribution and the ... -
Pilotprosjekt - Kartlegging av marin natur i Møre og Romsdal. Årsrapport 2017
Bekkby, Trine; Sigurd, Espeland; Dolan, Margaret; Rinde, Eli; Moy, Frithjof Emil; Elvenes, Sigrid; Gundersen, Hege; van Son, Thijs Christiaan; Sogn Andersen, Guri; Thormar, Jonas; Frigstad, Helene; Moy, Siri Røang; Beylich, Bjørnar; Albretsen, Jon; Naustvoll, Lars Johan; Tveiten, Lise Ann (Research report, 2018) -
Polar cod egg and larval drift patterns in the Svalbard archipelago
Eriksen, Elena; Huserbråten, Mats Brockstedt Olsen; Gjøsæter, Harald; Vikebø, Frode Bendiksen; Albretsen, Jon (Journal article; Peer reviewed, 2019)Spawning of polar cod (Boreogadus saida) in the vicinity of the Svalbard archipelago has not been directly observed. From the distribution pattern of polar cod 0-group observed during annual monitoring of the Barents Sea, ... -
Productive detours – Atlantic water inflow and acoustic backscatter in the major troughs along the Svalbard shelf
Menze, Sebastian; Ingvaldsen, Randi Brunvær; Nikolopoulos, Anna; Hattermann, Tore; Albretsen, Jon; Gjøsæter, Harald (Peer reviewed; Journal article, 2020)Atlantic Water (AW) flowing along the western and northern Svalbard shelf-break extends the Atlantic domain into the Arctic and is the region’s major source of heat, nutrients and advected plankton. We investigated the ...