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Now showing items 1512-1531 of 1576
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Uptake of Polystyrene Nanoplastic and its Impacts on the Proteome of Salmonid cells
(Master thesis; Mastergradsoppgave, 2023-06-27)Micro- and nanoplastic particles, produced from the breakdown of larger plastic debris, represent a whole new field of hazardous pollution with the potential to cause great damage on a range of marine species. This escalating concern of plastic pollution in marine environments and its consequential impacts on marine species, has emphasized the urgency for an in-depth understanding of the uptake and ... -
Urinsyre som adjuvans i fiskevaksiner
(Master thesis; Mastergradsoppgave, 2013-12-15)Vaksinering av fisk er ansett som den sikreste og mest kostnadseffektive strategien for å forebygge smittsomme sykdommer. Dagens vaksiner er dessverre lite effektive mot intracellulære patogener og kan være gjenstand for bivirkninger av ulik grad. Det er derfor nødvendig å utvikle nye og bedre vaksiner. En måte å gjøre dette på, er å prøve ut nye adjuvanser med potensial til å øke immunogeniteten ... -
Use and non-use values in an applied bioeconomic model of fisheries and habitat connections
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-25)In addition to indirect support to fisheries, marine habitats also provide non-use benefits often overlooked in most bioeconomic models. We expand a dynamic bioeconomic fisheries model where presence of natural habitats reduces fishing cost via aggregation effects and provides non-use benefits. The theoretical model is illustrated with an application to cold-water corals in Norway where two fishing ... -
Use conflicts in ecosystem-based management - The case of oil versus fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-01-30)Coastal states around the world are currently adopting an integrated and ecosystem-based approach to the management of coastal and ocean areas. The main aim is to promote resource use while protecting the integrity of the marine ecosystems. Focus is therefore on the conflict between economic development and conservation. Less attention is paid to the complex uses of the ocean and the conditions for ... -
Use of biodegradable materials to reduce marine plastic pollution in small scale coastal longline fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-14)Pollution from lost, abandoned, or discarded fishing gear is recognized as a global nature conservation concern. Longlining with hooks is a commonly applied fishing method in fisheries around the world. The longline gear consists of a mainline with a number of baited hooks that are attached to it by thinner twine (snoods) which are often made of plastic material such as polyamide (nylon) or ... -
Use of semi-pelagic trawling for reducing bycatch in shrimp trawls. Trials onboard R/V Johan Ruud 02-06 February 2015
(Research report; Forskningsrapport, 2015)The present study evaluates whether lifting the trawl doors and sweeps from the seabed can reduce bycatch in shrimp trawl fisheries. We carried out a catch comparison and catch ratio analysis between two gear setups, one with the trawl doors and sweeps at the seabed (the traditional way) and the other with the doors and sweeps lifted. The study was carried out on American plaice. The results ... -
Used vs. new: Does it have consequences for the performance of fishing gear?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-06)Sea trials to test size selectivity equipment in trawls are often limited in time because they are costly, and the results can be influenced by multiple factors that are often overlooked. In the Barents Sea gadoid trawl fishery, the use of a size sorting grid in front of the codend is compulsory. The flexigrid, a netting section containing two flexible grids, is the most widely used grid section in ... -
Users' attitudes toward fisheries management on Lake Zeway, Ethiopia
(Master thesis; Mastergradsoppgave, 2002-06-03)A resource management system combines a set of regulatory scheme within a particular resource to achieve a management outcome. The effectiveness of these regulatory measures depends on the support gained from the resource user group and the way they themselves define their problem, their involvement in the decisionmaking process, in installing and enforcing the regulations. Through semi-struct ... -
Using DNA Metabarcoding to Characterize the Prey Spectrum of Two Co-Occurring Themisto Amphipods in the Rapidly Changing Atlantic-Arctic Gateway Fram Strait
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-04)The two congeneric hyperiids Themisto libellula and T. abyssorum provide an important trophic link between lower and higher trophic levels in the rapidly changing Arctic marine ecosystem. These amphipods are characterized by distinct hydrographic affinities and are hence anticipated to be impacted differently by environmental changes, with major consequences for the Arctic food web. In this ... -
Using Machine Learning to Uncover Latent Research Topics in Fishery Models
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-16)Modeling has become the most commonly used method in fisheries science, with numerous types of models and approaches available today. The large variety of models and the overwhelming amount of scientific literature published yearly can make it difficult to effectively access and use the output of fisheries modeling publications. In particular, the underlying topic of an article cannot always be ... -
Using mathematical modelling to investigate the adaptive divergence of whitefish in Fennoscandia
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-30)Modern speciation theory has greatly benefited from a variety of simple mathematical models focusing on the conditions and patterns of speciation and diversification in the presence of gene flow. Unfortunately the application of general theoretical concepts and tools to specific ecological systems remains a challenge. Here we apply modeling tools to better understand adaptive divergence of whitefish ... -
Utvanning av klippfisk. Prosessens betydning for fiskens kvalitet
(Master thesis; Mastergradsoppgave, 2007-05)For å imøtekomme nye kjøpstrender, er det viktig å kunne tilby såkalte klar-til-bruk produkter av utvannet klippfisk. Samtidig er det viktig å produsere produkter med så lang holdbarhet i kjølt tilstand som mulig. Tidligere forsøk har imidlertid vist at holdbarheten til kjølelagret utvannet klippfisk er svært kort sammenlignet med produkter av fullsaltet klippfisk. Målet med dette arbeidet har ... -
Utvikling av molekylær vaksinestrategi for atlantisk laks mot ekstra- og intracellulære patogener
(Master thesis; Mastergradsoppgave, 2012-05-15)DNA-vaksiner har vist seg meget effektive mot enkelte virussykdommer – som for eksempel mot infeksiøs hematopoietisk nekrose (IHN) og viral hemoragisk septikemi (VHS). Beskyttelsen er mest sannsynlig mediert av antistoffer og cytotoksisk antiviral respons. Det er også vist at antistoffer er viktig i beskyttelse mot ekstracellulære bakterier (for eksempel Vibrio sp.), mens både cytotoksiske og ... -
Utvikling av smoltegenskaper og sjøvannstoleranse hos kjønnscellefri atlantisk laks (Salmo salar L.)
(Master thesis; Mastergradsoppgave, 2020-06-01)Gjennom å fjerne kjønnscellelinjen allerede på embryonalstadiet, har det blitt utviklet en slik ny metode for sterilisering av atlantisk laks. Fjerning av kjønnscellelinjen vil imidlertid potensielt kunne påvirke viktige endokrine og fysiologiske mekanismer, og dermed fiskens produksjonsegenskaper. For at en slik steriliseringsmetode skal kunne benyttes i kommersiell sammenheng må en nøye evaluere ... -
Utviklingen av oppdrettsnæringen av laks og ørret på Færøyene sammenlignet med utviklingen i Norge.
(Master thesis; Mastergradsoppgave, 2006-09-01)Oppdrett av laks og ørret på Færøyene utgjorde rundt en fjerdedel av den samlede eksportverdien på Færøyene i år 2000. Dette gjør oppdrettsnæringen til den viktigste inntektskilden til Færøyene etter fiskerinæringen. Det var derfor interessant for meg å finne ut hvordan denne næringen ble til. Oppgaven beskriver hvordan oppdrett av laks og ørret startet på Færøyene. Oppgaven gir videre en kartlegging ... -
Vaccination of Atlantic cod (Gadus morhua L.) against atypical furunculosis using different adjuvants
(Master thesis; Mastergradsoppgave, 2003-05-22)In recent years increased attention has been focussed on fish vaccines and vaccination against diseases in farmed fish. In this study, efficacy and side effects of vaccination against atypical furunculosis in Atlantic cod (Gadus morhua L.) were studied in an experimental trial by using different adjuvants. The different adjuvanted vaccines were administered by intraperitoneal injection (i.p.) ... -
Vaccination of Atlantic lumpfish (Cyclopterus lumpus L.) at a low temperature leads to a low antibody response against Aeromonas salmonicida
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-12-11)We present a study on the effect of water temperature on immunization of Atlantic lumpfish. In total, 360 fish were vaccinated with either 50 μl of an oil‐based injection vaccine (VAX), with Aeromonas salmonicida and Vibrio salmonicida antigens, or PBS. Fish were vaccinated at three different water temperatures, 5°C, 10°C and 15°C, and sorted into six groups (N = 60). Lumpfish were weighed every 3 ... -
Vaccine adjuvants in fish vaccines make a difference: comparing the effects of three adjuvants (Montanide ISA763A oil, CpG/poly I:C combo and VHSV glycoprotein) used alone or in combination to formulate an inactivated salmonid alphavirus whole virus antigen
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014) -
Vaccine Adjuvants Induce Formation of Intraperitoneal Extracellular Traps in Flounder (Paralichthys olivaceus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-30)Adjuvants are used to increase the strength, quality, and duration of the immune response of vaccines. Neutrophils are the first immune cells that arrive at the injection site and can release DNA fibers together with granular proteins, so-called neutrophil extracellular traps (NETs), to entrap microbes in a sticky matrix of extracellular chromatin and microbicidal agents. Similar extracellular ... -
Vaksinering og smoltifisering av atlantisk laks (Salmo salar L.). Betydning av sjøvannstoleranse for mottakelighet for infeksiøs pankreas nekrose (IPN)
(Master thesis; Mastergradsoppgave, 2015-11-14)Dødelighet hos smolt etter sjøutsett er et stort problem for lakseoppdrettsnæringen, og en betydelig del av all fisk som settes ut i havet når ikke konsum. Nøye overvåking og analysering av smolten gjøres for å sikre at den skal håndtere overgangen fra ferskvann til sjøvann på best mulig måte. Tross dette har man ikke klart å kartlegge nøyaktig hvorfor så mange fisk dør i starten av sjøfasen, og ...
