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norskNorges fiskerihøgskole: Nye registreringer
Viser treff 701-720 av 1642
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A catch comparison study on different codend designs to evaluate bycatch reduction in the North-East Atlantic deep-water shrimp (Pandalus borealis) fishery
(Master thesis; Mastergradsoppgave, 2020-05-15)Currently, there is a growing interest in the North-East Atlantic deep-water shrimp (Pandalus borealis) fishery with more actors expected to take part in the coming years. As the species and size of targeted shrimp varies globally, selectivity in this fishery is based on a grid system in front of a small mesh sized codend to avoid bycatch while simultaneously maintaining shrimp catches. However, ... -
The Role of Silicate in the Parasitism of Pleurosigma sp. Diatoms by the Thraustochytrid Phycophthorum isakeiti
(Master thesis; Mastergradsoppgave, 2020-05-15)The recently described thraustochytrid diatom parasite Phycophthorum isakeiti has been isolated from the marine system of northern Norway (Hassett, 2020). Protist P. isakeiti’s ecological role, biodiscovery potential, and interactions with a possible diatom host, Pleurosigma sp. remain largely unexplored. Here I present culturing experiments to test whether P. isakeiti is an obligate parasite. To ... -
Keratocyttlignende celler fra hornhinne og hud hos atlantisk laks (Salmo salar L.). Mikro- og nanoplast, mitokondrieutveksling, fusjonering og celletunneler
(Master thesis; Mastergradsoppgave, 2020-05-15)Huden og hornhinnen utgjør fiskens forsvarsbarrierer mot ytre påkjenninger. Begge har mobile celler kalt keratocytter. Dette er en av de mest bevegelige cellene som er kjent. Cellene gjenoppretter raskt barrieren hvis vevet skades ved å vandre ut fra sårkantene mot midten av såret. Sårhelingen effektiviseres ved at cellene bedriver fagocyttisk aktivitet av fremmedlegemer. Siden cellene er meget ... -
Markedsadgang for atlantisk laks fra Chile til USA
(Master thesis; Mastergradsoppgave, 2020-05-14)Norge eksporterte laks for 72,5 milliarder kroner i 2019 og i verdiskapning er laks den største og viktigste arten for Norge innen sjømat. Til sammenligning eksporterte Chile atlantisk laks for 32,8 milliard i 2019. En stor del av den norske eksporten går til EU-markedene, mens Chiles viktigste eksportmarked er USA. Formålet med denne oppgaven er å se om Chile har bedre markedsadgang inn til USA ... -
EUs markedsadgang for fisk og sjømat til Japan og Sør-Korea - En komparativ analyse av handelsvilkårene til EU og Norge
(Master thesis; Mastergradsoppgave, 2020-05-14)Den Europeiske Union (EU) er verdens største marked med en felles ytre tollmur, målt i verdi. EU er også Norges aller viktigste handelspartner for sjømateksport, og står for importen av om lag 2/3 av all norsk sjømateksport. Dette gjør at Norge står i en utsatt posisjon om EU skulle bortfalle som marked, og det er derfor interessant å skulle se på hvordan EUs markedsadgang er for sjømat i eksterne ... -
Trålernes leveringsplikt, en legitim ordning? En analyse av debatten omkring pliktsystemet og mulige konsekvenser ved bortfall av leveringsforpliktelsene.
(Master thesis; Mastergradsoppgave, 2018-11-15)Langs kysten av Nord-Norge, på stortinget, og i media går debatten varm når enkelte tråleiere, ikke lever opp til samfunnets forventninger som råstoffleverandør, og samfunnsbærende næring i fiskeriavhengige kommuner. Mer spesifikt handler debatten om politiske virkemidler, heretter kalt pliktsystemet, som har med hensikt å trygge bosetting og sysselsetting i tilgodesette kommuner. Gjennom pliktsystemet ... -
Spatial and temporal distributions in the Norwegian cod fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-25)Fisheries are characterized by variations in space and time. This study investigates the characteristics of seasonality in cod trawl fisheries in two distinct areas: the coast along the northern Norway and the high sea area of the Barents Sea. Catch per unit effort (CPUE) is used to proxy variation in stock abundance. A CPUE function has been estimated in the frequency‐domain framework, to detect ... -
Phylogenetic analysis of killer whale (Orcinus orca) and humpback whale (Megaptera novaeangliae) populations along the Northern Norwegian fjords and adjacent waters
(Master thesis; Mastergradsoppgave, 2020-06-08)Killer whales (Orcinus orca) and humpback whales (Megaptera novaeangliae) are two widely distributed cetacean species and both seasonally congregate in the waters off the fjords in Northern Norway to feast on the Norwegian Spring Spawning herring (Clupea harengus). With phylogenetic analysis of complete mitochondrial genomes, obtained by shotgun sequencing, from individuals sampled through four ... -
Shark discards in selective and mixed-species pelagic longline fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-31)The conservation status of several pelagic shark species is considered vulnerable with declining populations, yet data on shark fishing mortality remain limited for large ocean regions. Pelagic sharks are increasingly retained by mixed-species fisheries, or are discarded and not reported by selective fisheries for tunas (<i>Thunnus</i> spp.) or swordfish (<i>Xiphias gladius</i>). We estimated the ... -
Morphological and gene expressional effects of a 30 second warmwater treatment on Atlantic salmon (Salmo salar L.).
(Master thesis; Mastergradsoppgave, 2020-05-15)Vi undersøkte effektene av en 30 sekunders behandling ved 34 °C på Atlantisk laks (Salmo salar L.) under kontrollerte omstendigheter i et laboratorium. Disse effektene ble så sammenliknet med en Thermolicer-behandling fra felt. Effektene som ble undersøkt var: makroskopiske velferdsindikatorer, histologiske endringer og endringer i genuttrykket til laksen før/etter og på tvers av behandlinger. Vi ... -
Bioeconomic Modelling of Coastal Cod and Kelp Forest Interactions: Co-benefits of Habitat Services, Fisheries and Carbon Sinks
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-26)Ecosystem-based fisheries management seeks to expand upon the traditional one-stock fisheries management measures by internalizing the effects of fishing on marine ecosystems, and accounting for biological interactions among marine resources. The fact that marine resources provide multiple, often competing benefits, makes the accomplishment of these ecosystem-based fisheries management objectives ... -
Size selectivity and catch efficiency of bottom trawl with a double sorting grid and diamond mesh codend in the North-east Atlantic gadoid fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-28)This study investigated the size selectivity and catch efficiency in the North-east Atlantic demersal trawl fishery targeting cod (<i>Gadus morhua</i>) and haddock (<i>Melanogrammus aeglefinus</i>). The use of a sorting grid followed by a size selective codend is compulsory in this fishery. Experimental fishing was conducted with a commercially rigged trawl, flexigrid section, and diamond-mesh codend. ... -
Antimicrobial activity of small synthetic peptides based on the marine peptide turgencin A: Prediction of antimicrobial peptide sequences in a natural peptide and strategy for optimization of potency
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-30)Turgencin A, a potent antimicrobial peptide isolated from the Arctic sea squirt <i>Synoicum turgens</i>, consists of 36 amino acid residues and three disulfide bridges, making it challenging to synthesize. The aim of the present study was to develop a truncated peptide with an antimicrobial drug lead potential based on turgencin A. The experiments consisted of: (1) sequence analysis and prediction ... -
Dissemination of Piscine orthoreovirus-1 (PRV-1) in Atlantic Salmon (Salmo salar) during the Early and Regenerating Phases of Infection
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-20)<i>Piscine orthoreovirus-1</i> (PRV-1) can cause heart and skeletal muscle inflammation (HSMI) in farmed Atlantic salmon (<i>Salmo salar</i>), but the line of events from infection, pathologic change, and regeneration has not been thoroughly described. In this study, the cellular localization and variation of PRV-1 RNA and protein levels were analyzed at different times post-exposure in experimentally ... -
The Geopolitics of Fish in the Arctic
(Research report; Forskningsrapport, 2020)Climate change and declining sea-ice in the Central Arctic Ocean (CAO) has brought concerns that fish stocks may expand into the high Arctic. While the sub-Arctic seas of the North Pacific and the North Atlantic have abundant fish resources subject to major commercial fisheries for generations, the CAO has little or none. Concerns that fish stocks could expand into the CAO provided the impetus for ... -
Profit and Resource Rent in Fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-19)The difference between the concepts of profit and rent are discussed theoretically and by using aggregated data from the Icelandic and Norwegian fish harvesting industries. The former is a basic indicator for gauging the business performance of firms and industries, and the latter is important for the evaluation of the economic welfare contribution of resources and industries. The importance of ... -
Testing a size sorting grid in the brown shrimp (Crangon Crangon Linnaeus, 1758) beam trawl fishery
(Journal article; Tidsskriftartikkel, 2020-08-12)The North Sea brown shrimp (<i>Crangon crangon</i> Linnaeus, 1758) fishery became Marine Stewardship Council (MSC) certified in 2017. As part of the certification, the fishermen proposed to incrementally increase the mesh size of the codend used from 22 mm to 26 mm. As this increase in mesh size could result in a substantial loss of marketable sized brown shrimp (shrimp with total length equal or ... -
Assessments and their status in international law
(Conference object; Konferansebidrag, 2020-03)The workshop addressed the issue of "environmental impact assessments" in the new implementation agreement under the law of the sea convention on biodiversity beyond national jurisdiction (BBNJ. This was the opening presentation. The purpose was to give a brief overview of different types of assessments and their status in international law. I also made several comments to the negotiations. At the ... -
Bioactivity of Serratiochelin A, a Siderophore Isolated from a Co-Culture of Serratia sp. and Shewanella sp.
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-14)Siderophores are compounds with high affinity for ferric iron. Bacteria produce these compounds to acquire iron in iron-limiting conditions. Iron is one of the most abundant metals on earth, and its presence is necessary for many vital life processes. Bacteria from the genus <i>Serratia</i> contribute to the iron respiration in their environments, and previously several siderophores have been isolated ... -
Towards enhancing trustworthiness of socially interactive and culture aware robots
(Journal article; Tidsskriftartikkel, 2014-05-05)Building fine-tuned socially believable autonomous agents interacting with humans in virtual environments is an important aspect of agent design, as humans are influenced more by virtual agents with a high degree of behavioral realism. However, modeling complex psychological processes such as the trust-building between humans and culturallyadaptable agents in a realistic manner is not a trivial task. ...
