Browsing Department of Biological Sciences by Subject "759906"
Now showing items 1-20 of 66
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Acoustic attenuation by air bubble in bad weather conditions; a comparison of hull- and keel-mounted transducers
(Master thesis, 2009-08-25)Echo integration in bad weather conditions is problematic due to vessel- and wind-induced air bubble layer that is formed below the hull of a vessel, where acoustic transducers are mounted. The bubbles below the hull ... -
Age and growth determination and stock identification using statolith microstructure of Indian squid, Loligo duvauceli
(Master thesis, 2010-05-29)Age and growth and stock identification of Indian squid, Loligo duvauceli were examined by statolith microstructure and morphological measurements. The Indian squid were sampled from the Gulf of Thailand and the Andaman ... -
Age determination of Atlantic halibut (Hippoglossus hippoglossus L.) - Size at age and regional growth differences along the coast of Norway
(Master thesis, 2011-05-25)The traditional method for estimating age of Atlantic halibut (Hippoglossus hippoglossus) is through surface readings. Previous studies have not been compared to find the best practice for surface reading techniques. Based ... -
Analyses of bacteriophages to Yersinia ruckeri and the salmon (Salmo salar L.) antibody response to the bacteriophages.
(Master thesis, 2017-06-30)New technologies for producing Atlantic salmon like the recirculation aquaculture systems (RAS) have gained popularity, and has overthrown the traditional flow through systems used in the freshwater stages of the Atlantic ... -
Assessment of growth performance and liver lipid accumulation in Atlantic salmon (Salmo salar) fed an insect-based diet
(Master thesis, 2018-06-26)Increase in price and reduced availability of fish meal (FM) has caused the aquaculture industry to look at alternative sources for nutrients for feed production. Vegetable protein sources can replace a substantial part ... -
Atypiske Vibrio anguillarum: Karakterisering og virulenstesting på torskeyngel Gadus morhua
(Master thesis, 2009-06-02)Atlantisk torsk Gadus morhua er en av de viktigste artene i norsk oppdrettsnæring, og produksjonen er stigende. Sykdomsproblemene er betydelige, og blant annet klassisk vibriose (infeksjoner med Vibrio anguillarum) forårsaker ... -
Bacteriophages targeting pathogenic bacteria isolated from lumpfish (Cyclopterus lumpus L.) and Atlantic salmon (Salmo salar L.)
(Master thesis, 2020-12-03)Bacterial diseases in aquaculture lead to reduced health and mortality of fish as well as economic consequences for the producer. Antibiotics are an important antimicrobial to control bacterial diseases, however, concerns ... -
Betydning av Paranucleospora theridion og Salmonid Alfavirus (SAV) for utvikling av sykdom hos Atlantisk laks (Salmo salar L.) - Dobbelsmitte av laks med P. theridion og SAV, og betydning av temperatur for densitet av P. theridion i laks.
(Master thesis, 2014-06-02)Sykdomsproblemer som rammer lakseoppdrettnæringen på Vestlandet er i stor grad knyttet til gjelleproblemer, Pankreassykdom (PD) og lakselus (Lepeophtheirus salmonis). Disse sykdommene fører til redusert fiskevelferd og ... -
The biological indicators and temporal spawning habits of wrasse (Family: Labridae) from Sunnhordland
(Master thesis, 2015-06-15)The salmonid industry in Norway has grown exponentially. The greatest cost and danger to the salmonid industry are ectoparasitic sea lice (Lepeophtheirus salmonis). Sea lice attach to salmon causing damage and increasing ... -
Brood size in a subsocial bark beetle breeding in live plants
(Master thesis, 2009-06-01)Maternal care is found in many insect species, and maternal care affects both offspring survival and growth significantly. The effect of maternal care was tested on the monogynous bark beetle Scolytodes gunnerae which ... -
Can fresh water diets influence recovery in Atlantic salmon post-smolts after SAV3 challenge in sea water?
(Master thesis, 2020-07-08)Pankreas sykdom (PD) forårsaket av salmonid alfavirus (SAV) er en betydelig utfordring i norsk oppdrettsnæring. Å undersøke om forskjeller i fôrsammensetning før overføring til sjøvann kan påvirke sykdommens progresjon og ... -
Changes in histidine metabolism through smoltification and effect on cataract development in Atlantic Salmon (Salmo salar L.)
(Master thesis, 2021-01-20)Cataract is the collective definition of any light scattering opacities of the eye. Cataractogenesis is caused when there is a noticeable irregular light scattering because there has been a change in the tridimensional ... -
Cladorhizid sponges from hydrothermal vents and cold seeps in the NE Atlantic Ocean
(Master thesis, 2009-09-30)Sponges are known to frequently contain a great number of symbiotic organisms. Symbiosis is also a characteristic trait of vent and seep animals worldwide. Sponges in the deep sea family Cladorhizidae, otherwise also known ... -
Co-infection with Norwegian Salmonid Alphavirus (NSAV) and Infectious Pancreatic Necrosis Virus (IPNV) in Chinook Salmon Embryo Cells (CHSE-214).
(Master thesis, 2009-06-02)Infectious pancreatic disease (IPN) and pancreas disease (PD) of salmon are viral diseases caused by Infectious Pancreatic Necrosis Virus (IPNV) (Birnaviridae) and Salmonid Alphavirus (SAV) (Togaviridae). Both IPNV- and ... -
Competition of pathogens and probionts in cod yolk sac larvae measured in vivo, and the impact of increased temperature
(Master thesis, 2011-09-14)Aquaculture are today one of the biggest food-producing sectors in the world. Over the recent decades there has been a great increase in intensity and commercialization of aquaculture production, which has led to an ... -
Desmozoon lepeophtherii as a pathogen in Norwegian salmon aquaculture
(Master thesis, 2011-06-01)During late summer and autumn 2008 the Norwegian Veterinary Institute Bergen received several diagnostic cases with similar histopathological changes. Due to unknown cause of the the condition it was subsequently called ... -
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 ...