Browsing Department of Biological Sciences by Subject "751599"
Now showing items 1-20 of 30
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Adaptive Humoral Immune Response in Lumpfish, Cyclopterus lumpus L.
(Master thesis, 2015-10-05)The lumpfish, Cyclopterus lumpus L. is an emerging and most promising aquaculture fish currently used for a biological control against sea lice in salmonids. However, the lumpfish is prone to a number of bacterial diseases ... -
Atlantic halibut reovirus (AHRV): Reservoirs and transmission in culture systems.
(Master thesis, 2015-11-27)The ability to expand within the aquaculture industry is essentially based on reliable production of healthy juvenile fish. In 2013 a new aquareovirus was found to be associated with high juvenile mortality at a Norwegian ... -
Changes in gill Na+K+ATPase alfa subunit isoform expression during smoltification and in maturing male Atlantic salmon
(Master thesis, 2011-06-22)Distinct freshwater and seawater chloride cells have been identified in salmon gills and recent studies also suggest that there are specific freshwater (α1a) and seawater (α1b) isoforms of the α subunit ... -
Characterization of some Kunitz domain containing genes - possible link to Salivary gland
(Master thesis, 2015-10-15)As a hematophagous parasite, anticoagulants are crucial for L. salmonis. In hematophagous animals specific anticoagulants are produced by salivary gland in order to keep the blood liquid and to allow the parasite to process ... -
Characterization of the Atlantic cod (Gadus morhua L) eggs for estimation of spawning time and proportion of spawning females
(Master thesis, 2011-05-29)A set of eggs from first time spawning Atlantic cod (Gadus morhua L) was investigated for the understanding of variations in egg sizes, e.g. with time in the spawning season, daily inter and intra variations, daily ... -
The distribution of Skagerrak coastal cod (Gadus morhua) in relation to oxygen depletion, temperature and salinity, studied by acoustic telemetry in the Tvedestrand fjord in south-eastern Norway
(Master thesis, 2013-06-02)Decreased oxygen levels in coastal waters due to human activities are receiving increased attention as a potential threat to marine biodiversity and harvestable resources. Hydrographic measurements and hydroacoustic single ... -
Effect of different filter methods on water quality to a marine scallop hatchery
(Master thesis, 2010-05-31)Water quality in marine hatcheries is a critical aspect in the production of spat. Different filtering methods have been used to treat the intake seawater in the hatcheries. The Scalpro AS hatchery uses two different types ... -
The effect of low temperatures and photoperiods on growth in Atlantic salmon (Salmo salar)
(Master thesis, 2015-07-01)This thesis examines the growth response of Atlantic salmon post-smolt (Salmo salar) in a factorial experiment with three temperatures and two light regimes. The aim of this study was to investigate under laboratory ... -
Effect of tryptophan enriched diets on aggression in hierarchical groups of juvenile Atlantic salmon (Salmo salar)
(Master thesis, 2010-07-01)Aggression in fish hierarchies often leads to one dominant individual monopolizing resources (food/shelter), thus increasing their fitness. Meanwhile individuals in subordinate ranks, endure high stressful conditions, which ... -
Effects of chronic and periodic exposures to ammonia on growth and eye health in juvenile Atlantic halibut (Hippoglossus hippoglossus)
(Master thesis, 2010-02-20)The effect of chronic and periodic peaks of un-ionised ammonia (UIA-N) exposure on growth and eye health in juvenile Atlantic halibut, Hippoglossus hippoglossus, were examined. Fish with mean initial weight 51.7 g (SD, ... -
The effects of leptin and ghrelin on voluntary feed intake and appetite in Atlantic salmon Salmo salar
(Master thesis, 2013-10-01)Salmon farming has expanded dramatically in recent years, increasing the demand for both traditional feed ingredients and alternative proteins and oils. Developing new feed requires a deep understanding of appetite, feed ... -
Eksperimentell smitte av grønngylt, Symphodus melops, med V.tapetis - isolatene CECT 4600, LP2 og NRP45
(Master thesis, 2011-08-30)The use of wrasse (Labridae) as cleanerfish in salmonid aquaculture is the only method for removal of salmon lice that does not have any negative impact on the environment. The use of wild-caught wrasse has increased during ... -
Factors leading to variation of spawning time in the Barents Sea capelin (Mallotus villosus)
(Master thesis, 2015-11-20)Barents Sea capelin (Mallotus villosus) is a semalparous fish species, and the timing of spawning both in terms of age and season is variable. The present thesis explores potential factors leading to variation in timing ... -
Faunal Colonization of Submarine Mine Tailings: An Intertidal Experiment to Investigate the Infuence of Sediment Organic Carbon Content
(Master thesis, 2014-06-02)Current financial estimates of mineral mining in Norway are approximately 12 billion NOK per year. Most of the industry is located close to the coastline and the inert waste produced ( tailings', granulometrically similar ... -
Finding the way to food - Patch quality evaluation performed by young of the year freshwater pearl mussels (Margaritifera margaritifera)
(Master thesis, 2014-03-11)The freshwater pearl mussel Margaritifera margaritifera is considered a key species in aquatic environments. The juvenile stage is considered to be the most volnarable stage for the young mussels due to pollution challenges ... -
Genetic ontogeny of pancreatic enzymes in Labrus bergylta larvae and the effect of feed type on enzyme activity and gene regulation
(Master thesis, 2012-06-01)In the later years increased interest in the use of Labrus bergylta (ballan wrasse) as a cleaner fish on Salmo salar (Atlantic salmon) has caused the emergence of commercial farming of L. bergylta. In order to cultivate ... -
Gill and labial palp areas in blue mussels (Mytilus edulis) at sites with different food quantity
(Master thesis, 2013-06-01)Suspension feeding bivalves captures and process particles with their gills and labial palps. These foraging apparatus are known to be flexible in size related to seston quantity and quality. It is important to understand ... -
The importance of feeding in determining the sensitivity of benthic invertebrates to future climate change in the tunicate species Ciona intestinalis
(Master thesis, 2016-03-14)Anthropogenically induced global climate change is one of the worlds biggest threats today, with marine ecosystems particularly vulnerable. In the future, the ocean temperature is expected to rise with 2 °C followed by a ... -
Methods for acoustic identification and measurements of copepod abundance at specific North Sea sandeel grounds
(Master thesis, 2011-04-15)In recent years there has been a decline in both size and the geographical distribution of the sandeel stock. The decline has been particularly profound in the Norwegian economic zone where the sandeel play an important ... -
Microbial winter and spring bloom dynamics in a high Arctic fjord
(Master thesis, 2014-06-02)Knowledge of the seasonal dynamics within the Arctic marine microbial network is scarce, particularly during the polar night period. The abundances of different microbial groups in Adventfjorden, Svalbard were investigated ...