Browsing Department of Biological Sciences by Subject "759906"
Now showing items 21-40 of 88
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Development of a vaccine against salmon louse (Lepeophtheirus salmonis)
(Master thesis, 2018-06-26)Aquaculture is a growing industry whilst facing a major problem, the ectoparasite Lepeophtheirus salmonis. Parasite control in 2015 was estimated to cost 5 billion NOK. The challenges with the parasite are complex, and the ... -
Diel vertical migration and feeding pattern of M. muelleri in Masfjorden in late autumn
(Master thesis, 2009-03-20)The purpose of this study was to investigate diel vertical migration, feeding pattern and diet composition of mesopelagic fish Maurolicus muelleri in Masfjorden in late autumn and compare these with the previous studies. ... -
The effect of pot design on behaviour and catch efficiency of gadoids
(Master thesis, 2015-05-29)The behavioural response of fish to pots is poorly understood but is a vital component of the fish capture process. Here, the behaviour of gadoids prior to and after capture in different baited fish pot designs was observed ... -
Effekt av ferskvassbehandling på gjeller hjå laks (Salmo salar L.) med amøbegjellesjukdom (AGD): gjellepatologi, prevalens og tettleik av Paramoeba perurans
(Master thesis, 2020-06-23)Eit av dei største problema ein opplever i sjøfasen hjå oppdrettslaks er dårleg gjellehelse. Det har eit komplekst årsakstilhøve og er ofte assosiert med eit breitt spekter av patogen. Eit av patogena som kan infisere ... -
Effekt av ulike immuniseringsregimer mot pankreassykdom (PD) hos Atlantisk laks (Salmo salar L.), og betydningen av lakselus (Lepeophtheirus salmonis Krøyer) som stressfaktor ved immunisering.
(Master thesis, 2016-05-31)Den kommersielle vaksinestrategien som hittil har vært brukt i Norge for å bekjempe pankreassykdom (PD) har ikke hatt optimal effekt, ettersom en fremdeles opplever sykdom og dødelighet, til tross for vaksinasjon. Det er ... -
Eksperimentell eksponering av laksefiskyngel for salmonid alphavirus (SAV3) – Sammenligning av mottakelighet og konsekvens hos brunørret (Salmo trutta L.) og atlantisk laks (Salmo salar L.)
(Master thesis, 2018-12)Salmonid alfavirus (SAV) forårsaker pankreassyke (PD) hos laksefisk i oppdrett. PD er utbredt i Norge og var den mest rapporterte virussykdommen i 2017. Det er en bekymring at rømt oppdrettsfisk som er infisert med viruset ... -
Energy dilution with α-cellulose in diets for Atlantic cod (Gadus morhua L.) juveniles - effects on growth, feed intake, liver size and digestibility of nutrients
(Master thesis, 2009-05-03)Atlantic cod (Gadus morhua) is known to grow large livers, especially farmed cod, but commercially, muscle growth is preferred, due to profits. Therefore, main focus in this feeding trial was to achieve lowered liver size, ... -
Et longitudinelt studium av utvalgte gjellepatogener assosiert med gjellesykdom hos oppdrettslaks i Vest-Norge.
(Master thesis, 2015-01-08)Studien var en longitudinel undersøkelse av forekomst av gjellepatogener. En populasjon av høstutsatt Atlantisk laks på Vestlandet ble fulgt gjennom ett år i sjø (oktober 2013 - september 2014). Det ble utført månedlige ... -
Extracting single target information from a simple echo sounder mounted on a drifting fish aggregating device (FAD)
(Master thesis, 2015-06-29)Fish aggregating devices (FADs) are widely used by purse seiners in the tropical tuna fisheries. Many species of fish including juvenile tuna often associate with these FADS. There are global decline in tuna catch largely ... -
Factors affecting the efficiency and selectivity of the Andaman Sea demersal sampling trawl
(Master thesis, 2011-12-05)The average catch per unit of swept area (CPUE) from bottom trawl surveys by research vessels are used as an index of abundance for the demersal fish resources of the Thai waters of the Andaman Sea. The surveys are carried ... -
Feltoppfølging av rognkjeks vaksinert mot Aeromonas salmonicida A-lagstype V og VI
(Master thesis, 2017-06-16)Efficient sea-lice control is still one of the most important challenges for the salmon farming industry, and use of cleaner fish as biological delousing has increased considerably in recent years. Mortality of lumpsucker ... -
A first examination of its biology, ecology and fisheries: What is the role of European Hake (Merluccius merluccius) in the waters of the northern North Sea and along the Norwegian coast?
(Master thesis, 2015-05-29)Based on the results from the annual stock assessment of the European hake (Merluccius merluccius) by the International Council for the Exploration of the Sea, a fourfold increase of the spawning stock biomass can be ... -
Francisella philomiragia subsp. noatunensis i torskeleukocytter
(Master thesis, 2009-06-22)Det er velkjent at en rekke intracellulære bakterier, inkludert flere arter innen slekten Francisella, har evne til å oppholde seg og formere seg i immuncellene. I dette studiet ble det utført smitteforsøk in vitro der det ... -
Fresh- or seawater eels, or mixed life history strategies: what do the parasites tell?
(Master thesis, 2020-07-08) -
Genetic variation of Piscine orthoreovirus and the presence of HSMI in farmed Atlantic salmon from Arctic Norway
(Master thesis, 2021-06-22)Piscine orthoreovirus-1 (PRV1) is ubiquitous throughout the world and can cause heart- and skeletal muscle inflammation (HSMI) in farmed Atlantic salmon (Salmo salar). HSMI was first diagnosed in Norway in 1999. The virus ... -
Herring (Clupea harengus) in Lindåspollene before and during spawning: spatial decisions and school dynamics
(Master thesis, 2011-06-01)Abstract This study reports on the school dynamics of a self-sustained local population of Atlantic herring (Clupea harengus) in Lindåspollene, south-western Norway, during pre-spawning and spawning, observed over a period ... -
Histochemical characterization of AGD lesions in ballan wrasse (Labrus bergylta)
(Master thesis, 2017-07-07)With the increasing problem of sea lice (Lepeoptheirus salmonis) in production of Atlantic salmon (Salmo salar), the use of biological and non-drug treatments, such as cleaner fish, like ballan wrasse (Labrus bergylta) and ... -
Holocene forest development and tree-limit changes in Ridalen, in the Røros mountains
(Master thesis, 2010-07-02)Holocene forest development, tree migration and tree-line fluctuations have been reconstructed from peat sequences, derived from two study localities situated along an altitudinal transect between the north boreal and low ... -
Identification of immunogenic surface proteins of Pasteurella atlantica genomovar salmonicida
(Master thesis, 2023-06-02)