English
norskBlar i forfatter Artikler, rapporter og annet (Norges fiskerihøgskole) "Olsen, Ragnar Ludvig"
Viser treff 1-13 av 13
-
Determination of pH in pre rigor fish muscle - method matters
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-06)The determination of post mortem muscle pH are often carried out in studies on how pre-slaughter handling influences the development of rigor mortis and the quality of the fish products. The analysis might be performed by inserting a pH-electrode into the intact flesh or using a suspension containing a minced muscle sample. Although it has been known for a long time that mincing muscle tissue ... -
Fish silage hydrolysates: Not only a feed nutrient, but also a useful feed additive
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-06)Background:<br> Processing of fish and shellfish may result in substantial amounts of by-products and unless they can be used as food, the most realistic option in most cases is the production of preserved feed nutrients. If large volumes are available, reduction to fishmeal and fish oil is the preferred technology. However, fresh by-products are most often available in insufficient quantities ... -
Influence of different cold storage temperatures during the Rigor mortis phase on fillet contraction and longer-term quality changes of Atlantic cod fillets
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-05-01)Pre rigor produced fillets of Atlantic cod become shorter and more firm than post rigor produced fillets. In pre rigor excised muscle from warm-blooded animals and warm-water adapted fish, cold shortening, extensive contraction during cold storage, is known to occur. The aim of the present work was to study if the extent of fillet shortening in Atlantic cod could be reduced by a slight temperature ... -
Lipid yield from the diatom Porosira glacialis is determined by solvent choice and number of extractions, independent of cell disruption
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-17)Cell wall disruption is necessary to maximize lipid extraction yields in conventional species of mass-cultivated microalgae. This study investigated the effect of sonication, solvent choice and number of extractions on the lipid yield, lipid class composition and fatty acid composition of the diatom <i>Porosira glacialis</i>. For comparison, the diatom <i>Odontella aurita</i> and green alga <i>Chlorella ... -
Microplastics in fish and shellfish - A threat to seafood safety?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-23)Plastic litter in the oceans is a major environmental problem, and small size plastics (microplastics) have been detected in many species of fish and shellfish consumed by humans. The purpose of this paper is to evaluate the knowledge on microplastics in fish and shellfish in relation to a possible threat to seafood safety. In fish and crustacean species, the presence of microplastics has in most ... -
Nye FoU-tilbud til sjømatindustri. Forslag til strategi for fiskeriforskningsmiljøet i Tromsø
(Research report; Forskningsrapport, 2000)Rapport fra en arbeidsgruppe nedsatt for å fremme forslag til ny strategi for fiskeriforskningsmiljøet i Tromsø for nye FoU-tilbud til sjømatindustrien. Gruppen fikk i oppgave å gi innspill til styrene i Norges Fiskerihøgskole og Fiskeri¬forsk¬ning om hvordan de to institusjonene i samarbeid kan styrke satsingen overfor norsk fiske- og sjømatindustri. Gruppens anbefalinger er at styrene i ... -
Obesity-induced alterations in the gut microbiome in female mice fed a high-fat diet are antagonized by dietary supplementation with a novel, wax ester–rich, marine oil
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-09)Dietary supplementation with calanus oil, a novel wax ester–rich marine oil, has been shown to reduce adiposity in high-fat diet (HFD)–induced obese mice. Current evidence suggests that obesity and its comorbidities are intrinsically linked with unfavorable changes in the intestinal microbiome. Thus, in line with its antiobesity effect, we hypothesized that dietary supplementation with calanus oil ... -
Possible Health Effects of a Wax Ester Rich Marine Oil
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-26)The consumption of seafood and the use of fish oil for the production of nutraceuticals and fish feed have increased over the past decades due the high content of long-chain polyunsaturated omega-3 fatty acids. This increase has put pressure on the sustainability of fisheries. One way to overcome the limited supply of fish oil is to harvest lower in the marine food web. <i>Calanus finmarchicus</i>, ... -
Quality aspects of fillet, loin and tail products made from live-stored feed-deprived Atlantic cod (Gadus morhua L.) at different times post mortem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-18)During last decade, the amount of live-caught Atlantic cod stored in sea cages has increased. However, the issues of feeding regime during live-storage and time of processing after slaughter are central to provide high quality products. The goal of this study was to investigate how the quality of fresh fillet, loin and tail products can be affected by the length of feed-deprivation and the ... -
A simple method to isolate fatty acids and fatty alcohols from wax esters in a wax-ester rich marine oil
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-12)Calanus finmarchicus is one of the most important zooplankton species in the North Atlantic. The zooplankton is currently being harvested and industrially processed to a marine oil product for human consumption as a marine nutraceutical containing long-chain omega-3 polyunsaturated fatty acids. This oil is very rich in wax esters, a lipid class where fatty acids are esterified to long chain fatty ... -
Stability of lipids during wet storage of the marine diatom Porosira glacialis under semi-preserved conditions at 4 and 20 °C
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-17)Cultivation of diatoms may help alleviate the pressure on wild fish stocks for marine nutrient availability in aquaculture feed and for human consumption. However, the lipids in microalgae biomass are easily deteriorated, both trough lipolysis and degradation of polyunsaturated fatty acids (PUFA). Proper storage conditions are therefore necessary to maintain the lipid quality. Additionally, the ... -
Thee level of eicosapentaenoic (EPA),but not docosahexaenoic acid (DHA) is related to formulation and concentration of EPA and DHA in feed
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-22)The present study investigated how the concentration of PUFA in blood and muscle of Atlantic salmon (<i>Salmo salar</i> L.) changed when fed 4 diets containing very different amounts of LC-PUFA in fresh water for 84 days. The n-3 LC-PUFA constituted 4.4, 24.2, 18.4, and 51.5% of the total fatty acids in the diets made with rapeseed oil, anchoveta oil, a combination of rapeseed oil (60%) and anchoveta ... -
Torsk fra merd: Pre-rigor produksjon av loins med skinn
(Research report; Forskningsrapport, 2009-03)I dette forsøket ble torsk fanget levende og lagret i merd hvor den ble fôret med hhv. lodde og kommersielt torskefôr i 3 måneder. Etter skånsom slakting og utblødning i 30 minutter, ble fisken sløyd og de biologiske data registrert før maskinell filetering enten pre-rigor (innen 2 timer etter død) og post-rigor (etter 4 dagers is-lagring av sløyd fisk). Det ble produsert ryggfileter (Loins) enten ...
