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Opportunities for advancing ecosystem-based management in a rapidly changing, high latitude ecosystem
(Journal article; Peer reviewed, 2018)Unprecedented and rapid changes are ongoing in northern high latitude, marine ecosystems, due to climate warming. Species distributions and abundances are changing, altering both ecosystem structure and dynamics. At the ... -
Opposite selection on behavioural types by active and passive fishing gears in a simulated guppy Poecilia reticulata fishery
(Peer reviewed; Journal article, 2015) -
Optimal estimation of lice release from aquaculture based on ambient temperatures
(Peer reviewed; Journal article, 2020)Models for mapping and forecasting infective pressure from salmon louse Lepeophtheirus salmonis larvae are of major importance in the Norwegian government’s management of salmonid aquaculture. These models use site-reported ... -
Optimalt fôr som gir fast filet
(Nofima rapportserie, Research report, 2010)Formålet med studien var å undersøke om fôr tilsatt aminosyrene arginin eller glutamat kan forbedre teksturen av oppdrettslaks. I tillegg ønsket vi å undersøke om bløt filet kan knyttes til nedsatt leverfunksjon eller andre ... -
Optimization of the Balance between Protein, Lipid and Carbohydrate in Diets for Lumpfish (Cyclopterus lumpus)
(Peer reviewed; Journal article, 2022)The aim of this study was to investigate how the dietary balance between protein, lipid, and carbohydrate affects growth, welfare, and health with focus on immune responses, in lumpfish of body weight ranges 1.7-10 g and ... -
Optimizing copper spheres for precision calibration of hydroacoustic equipment
(Journal article; Peer reviewed, 1982)n operational definition of backscattering cross section is developed for the wideband reception of finite echoes. This is supported by relative measurements on a set of copper spheres by each of four echo sounders operating ... -
Optimizing size selectivity and catch patterns for hake (Merluccius merluccius) and blue whiting (Micromesistius poutassou) by combining square mesh panel and codend designs
(Peer reviewed; Journal article, 2022)Gear modifications in fisheries are usually implemented to obtain catch patterns that meet management objectives. In the Basque bottom trawl fishery, gear regulations include the use of a square mesh panel (SMP) placed at ... -
Optimizing the use of quicklime (CaO) for sea urchin management — A lab and field study
(Peer reviewed; Journal article, 2020)Mass blooms of sea urchins sometimes cause kelp forest collapses that can last for decades. Quicklime has historically been used to reverse those conditions, but the efficacy of liming has varied along latitudinal and ... -
Orientation behavior and swimming speed of Atlantic herring larvae (Clupea harengus) in situ and in laboratory exposures to rotated artificial magnetic fields
(Peer reviewed; Journal article, 2020) -
Origin and expansion of the world’s most widespread pinniped: Range-wide population genomics of the harbour seal (Phoca vitulina)
(Peer reviewed; Journal article, 2022)The harbour seal (Phoca vitulina) is the most widely distributed pinniped, occupying a wide variety of habitats and climatic zones across the Northern Hemisphere. Intriguingly, the harbour seal is also one of the most ... -
Origin of marine invertebrate larvae on an Arctic inflow shelf
(Peer reviewed; Journal article, 2022)Many benthic invertebrate taxa possess planktonic early life stages which drift with water currents and contribute to dispersal of the species, sometimes reaching areas beyond the current ranges of the adults. Until recently, ... -
Osmotic cataract causes reduced vision in wild Atlantic salmon postsmolts
(Journal article; Peer reviewed, 2003-07-08)Osmotic cataracts were diagnosed in all of 191 Atlantic salmon Salmo salar L. postsmolts caught during 8 trawl hauls on the western side of the Vøringsplateau, Norwegian Sea, in June 2001. The changes varied from a hazy ... -
Ossification of Atlantic cod (Gadus morhua) – Developmental stages revisited
(Peer reviewed; Journal article, 2017)In studies of marine larvae, it is common to use days post-hatch as a developmental reference point. We show that age is a poor measure of morphological and physiological development in Atlantic cod. Therefore, we propose ... -
Otolith δ13C values as a metabolic proxy: Approaches and mechanical underpinnings
(Journal article; Peer reviewed, 2019)Knowledge of metabolic costs associated with maintenance, foraging, activity and growth under natural conditions is important for understanding fish behaviours and the bioenergetic consequences of a changing environment. ... -
Otolith “spawning zones” across multiple Atlantic cod populations: Do they accurately record maturity and spawning?
(Peer reviewed; Journal article, 2021)Specific changes identified in the otolith macrostructure of Northeast Arctic cod as “spawning zones” are presumed to represent spawning events, but recent experimental studies have challenged this relationship. Because ... -
Out-of-season spawning affects the nutritional status and gene expression in both Atlantic salmon female broodstock and their offspring
(Peer reviewed; Journal article, 2020)The Atlantic salmon aquaculture industry relies on adjustments of female broodstock spawning season to meet the demand for delivery of embryos outside the natural spawning season. Earlier results from zebrafish have shown ... -
Overexploitation, Recovery, and Warming of the Barents Sea Ecosystem During 1950–2013
(Peer reviewed; Journal article, 2021)The Barents Sea (BS) is a high-latitude shelf ecosystem with important fisheries, high and historically variable harvesting pressure, and ongoing high variability in climatic conditions. To quantify carbon flow pathways ... -
Overexpression of cyclooxygenase-2 in adipocytes reduces fat accumulation in inguinal white adipose tissue and hepatic steatosis in high-fat fed mice
(Journal article; Peer reviewed, 2019)Cyclooxygenases are known as important regulators of metabolism and immune processes via conversion of C20 fatty acids into various regulatory lipid mediators, and cyclooxygenase activity has been implicated in browning ... -
Overvåking av forurensningsituasjonen i indre Oslofjord 1998 [Fagrådsrapport nr. 71]
(NIVA-rapport;OR-4058, Research report, 1999-06-01)Vannkvaliteten i fjordens overflatelag sommeren 1998 var omtrent like bra som i 1996/1997, som var meget bra år sammenlignet med 1994 og 1995, hvor overløp og flom (1995) preget forholdene. Den milde vinteren var lite ... -
Overvåking av forurensningsituasjonen i indre Oslofjord 1999 [Fagrådsrapport nr. 77]
(NIVA-rapport;OR-4246, Research report, 2000-06-01)Vannkvaliteten i fjordens overflatelag sommeren 1999 var noe dårligere enn i 1998, men klart bedre enn i 1994/95, hvor den var påvirket av ekstra store overløp og storflom. Juni 1999 var relativt kald og nedbørrik. Intensive ...