Blar i Department of Biological Sciences på emneord "VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920"
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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 ... -
Anaesthesia of farmed fish with special empasis on atlantic cod (Gadus morhua) and atlantic habibut (Hippoglossus hippoglossus)
(Doctoral thesis, 2011-03-23)During the life cycle as farmed animals there are numerous situations where fish are subjected to handling and confinement. Netting, weighing, sorting, vaccination, transport and, at the end, slaughter are common events ... -
Behavioral responses of herring (Clupea harengus) to 1–2 and 6–7 kHz sonar signals and killer whale feeding sounds
(Peer reviewed; Journal article, 2009)Military antisubmarine sonars produce intense sounds within the hearing range of most clupeid fish. The behavioral reactions of overwintering herring Clupea harengus to sonar signals of two different frequency ranges 1–2 ... -
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 ... -
Does size matter? A bioeconomic perspective on optimal harvesting when price is size-dependent
(Peer reviewed; Journal article, 2011-09-09)Body size is a key parameter influencing demographic characteristics of fish populations as well as market value of landed catch. Yet in bioeconomic modelling body size is often an overlooked biological and economic ... -
Effects of habitat enrichment and food availability on the foraging behaviour of juvenile Atlantic Cod (Gadus morhua L)
(Peer reviewed; Journal article, 2011-04-13)The environment can play an important role in shaping how an animal behaves, and how well the animal performs in a particular environment can be influenced by early experiences. The tradition of releasing captive-reared ... -
Effects of reduced diameter of bag cultures on content of essential fatty acids and cell density in a continuous algal production system
(Peer reviewed; Journal article, 2011-02-16)Cell density and fatty acid (FA) content of Pavlova lutheri and Chaetoceros muelleri were analysed in a continuous algal production system (250-L bags) with reduced diameter. The cell density and FA content and composition ... -
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 ... -
Genomic Resources for Sea Lice: Analysis of ESTs and Mitochondrial Genomes
(Peer reviewed; Journal article, 2011-07-12)Sea lice are common parasites of both farmed and wild salmon. Salmon farming constitutes an important economic market in North America, South America, and Northern Europe. Infections with sea lice can result in significant ... -
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 ... -
Infectious salmon anaemia virus (ISAV): Evolution, genotyping, reservoirs and transmission
(Doctoral thesis, 2012-06-01)The first officially registered outbreak of infectious salmon anaemia (ISA) started in Norway in November 1984 (Thorud and Djupvik, 1988). It was a chronically proceeding disease among Atlantic salmon (Salmo salar) parr ... -
Molecular characterisation of key components of the mucosal immune system in Atlantic salmon (Salmo salar L) and transcriptome analysis of responses against the salmon louse (Lepeophtheirus salmonis)
(Doctoral thesis, 2012-04-17)Mucosal immunity in mammals is mediated mainly by secretory immunoglobulin A (SIgA), which is produced by IgA plasma cells commonly located in the lamina propria, and a transport system involving the polymeric Ig receptor ... -
Multiple-locus, variable number of tandem repeat analysis (MLVA) of the fish-pathogen Francisella noatunensis
(Peer reviewed; Journal article, 2011-01-24)Background: Since Francisella noatunensis was first isolated from cultured Atlantic cod in 2004, it has emerged as a global fish pathogen causing disease in both warm and cold water species. Outbreaks of francisellosis ... -
Prevalence of infectious salmon anaemia virus (ISAV) in wild salmonids in western Norway
(Peer reviewed; Journal article, 2005-08-09)Studies of infectious salmon anaemia virus (ISAV), an important pathogen of farmed salmon in Norway, Scotland, the Faeroe Islands, Ireland, Canada, the USA and Chile, suggest that natural reservoirs for this virus can be ... -
Review of the Tanzanian prawn Fishery
(Master thesis, 2011-05-30)A review of the prawn fishery of Tanzania from its development in early 1980's to closure in 2008 has been performed based on three major data sets; industrial prawn and fish catch data from Fisheries Division, river ... -
Shedding Light on Fish Otolith Biomineralization Using a Bioenergetic Approach
(Peer reviewed; Journal article, 2011-11-14)Otoliths are biocalcified bodies connected to the sensory system in the inner ears of fish. Their layered, biorhythm-following formation provides individual records of the age, the individual history and the natural ... -
Strategies for partition between reproductive investment and body growth in stationary and migratory stocks of Atlantic herring
(Master thesis, 2011-06-01)The present study focused on the trade-off between reproductive investment and body growth of migratory and stationary Atlantic herring (Clupea harengus) populations. Published data from Norwegian spring-spawning (NSS) ... -
Triploid induction in Atlantic cod (Gadus morhua L.) by the use of different pressure levels
(Master thesis, 2011-10-31)In the present experiment, different levels of pressure were investigated to see if it was possible to induce triploidy at a lower pressure level than previously used for Atlantic cod (Gadus morhua). Newly fertilized eggs ... -
Zooplankton abundance and distribution around on a seamount in the Andaman Sea, Thailand, measured with acoustic methods and biological sampling
(Master thesis, 2011-08-30)Studies of abundance and distribution of zooplankton with acoustic instruments is new methodology in Thailand. In order to evaluate if the zooplankton could be detected and measured, a specific area around a seamount in ...