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Optimal acoustic beam pattern corrections for split beam transducers
(ICES CM Documents;1990/B:30, Working paper, 1990)Precise in situ target strength estimates of fish can only be made when the effect of the transducer directivity is totally removed from the recorded target amplitudes. By guiding a standard calibration target through ... -
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 ... -
Optimal føringskapasitet og velferd for levende, villfanget torsk. Del 2: Praktiske forsøk - uttesting av etasjeskiller for økt hvileareal
(Rapport fra Havforskningen;Nr.1-2010, Working paper, 2010-01)Sluttrapport til Fiskeri- og Havbruksnæringens Forskningsfond. Optimal føringskapasitet og velferd for levende villfanget torsk Del 2: Praktiske forsøk – uttesting av etasjeskiller for økt hvileareal -
Optimal føringskapasitet og velferd for levende, villfanget torsk. Teknisk tilrettelegging ombord på MS Trino
(Rapport fra Havforskningen;Nr.7-2008, Working paper, 2008-05)Fangstbasert akvakultur har lange tradisjoner i Norge. Næringen har et betydelig potensial for økt verdiskaping, særlig for mellomlagring og oppforing av villfanget torsk. Med en sikker tilgang av villfanget torsk i et ... -
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 ... -
Optimising delousing strategies: developing best practice recommendations for maximal efficacy and positive welfare - Final Report
(Rapport fra havforskningen;, Research report, 2023)The salmon aquaculture industry currently uses a range of strategies to combat salmon louse epidemics, however acute delousing methods are limited due to poor efficacy, poor welfare and environmental impacts, or potential ... -
Optimization of purse seines by large meshed sections and low lead weight. Theoretical considerations, sinking speed measurements and fishing trials.
(ICES CM Documents;1988/B:25, Working paper, 1988)Theoretical considerations on material requirements and sinking speed by use of different mesh size and lead weight in purse seines are outlined. Measurements confirmed that the sinking speed varied with mesh size and ... -
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 nutrient reduction strategies in the marine environment - a simplified example from the north sea
(Fisken og havet, Research report, 1998)A coupled three dimensional physical, biological model (NORWECOM) has been used to study the effect of different reduction scenarios of nutrient inputs to the North Sea. Six different simulations where the nutrient loads ... -
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 ... -
Optimum size of sampling unit for estimating the density of marine populations
(ICES CM Documents;1989/D:22, Working paper, 1989)Data from several trawling experiments and from some scallop dredge surveys indicate that, within limits, a srnaller sampling unit can be more effective than a larger unit for marine abundance surveys. Taking into account ... -
Organic waste and antibiotics from aquaculture
(ICES CM Documents;1988/F:14, Working paper, 1988)During the past year three joint projects have been conducted concerning the fate of organic waste and antibiotics from various Norwegian fish farms. The projects are investigating the following topics: - decomposition ... -
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) -
Orientation measurements of cod in Lofoten obtained from underwater photographs and their relation to target strength
(ICES CM Documents;1971/B:17, Working paper, 1971) -
Orientation of homing salmon (Salmo salar L.) mapped in relation to geomagnietic field.
(ICES CM documents;2009/B:05, Working paper, 2009) -
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, ... -
Oseanografiske forhold i området Malangsgrunnen - Fugløybanken - Tromsøflaket: En oversikt
(Fisken og havet - Serie B, Working paper, 1976)