Blar i Department of Biological Sciences på emneord "Atlanterhavslaks"
Viser treff 1-20 av 21
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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 ... -
Betydinga av oppvekstmiljø for fødeåtferd hjå lakseyngel
(Master thesis, 2017-01-16)Fisk nytta til styrking av populasjonar som veks opp hjå klekkeri, har vist seg å ha høgare dødelegheit enn vill fisk. Hovudårsakane til dette er svolt og predasjon. Med føremål å auke andelen fisk som overlev har ein i ... -
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 ... -
Can enrichment improve the post-release survival of hatchery-reared Atlantic salmon fry (Salmo salar)? – A field experiment
(Master thesis, 2018-06-26)Release of captive-reared fish to supplement reduced, wild populations has become a common tool for conservation and management. Such attempted population enhancements have, however, had limited success, and several previous ... -
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 ... -
The effect of water currents on post-smolt Atlantic salmon, Salmo salar (L.). A welfare approach to exposed aquaculture
(Doctoral thesis, 2017-06-27)The future development of Atlantic salmon (Salmo salar L.) aquaculture is limited by the availability of space and suitable environments along coastal areas. Utilising exposed areas is a possible solution to this problem. ... -
Effects of gas supersaturation on migrating Atlantic salmon smolt (Salmo salar) in Evangervatnet
(Master thesis, 2016-11-21)Total dissolved gas supersaturation (TDGS) downstream of power plants may cause harmful effects on the fauna in many rivers. The harmful effects of TDGS are known as gas bubble disease (GBD). TDGS has been proposed as one ... -
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 ... -
Environmental and biological requirements of post-smolt Atlantic salmon (Salmo salar L.) in closed-containment aquaculture systems
(Doctoral thesis, 2017-06-22)Production of Atlantic salmon (Salmo salar L.), exceeds 2 million tonnes globally, and accounts for 90% of the salmon on the market. Presently, the predominant production of post-smolt Atlantic salmon occurs in open sea ... -
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 ... -
Fish protein hydrolysates based on Atlantic salmon by-products. Enzyme cost-efficiency and characterization of sensory, surface-active and nutritional properties
(Doctoral thesis, 2016-06-21)The world fisheries and fish farming industries generate large amounts of by-products after the primary processing of fish to edible products. In Norway alone, this accounted for almost 900,000 tons in 2014. Based on present ... -
Functional analysis of the nonvisual opsins melanopsin and vertebrate ancient opsin (VA opsin) in Atlantic salmon (Salmo salar)
(Master thesis, 2017-06-15)The role of nonvisual photoreceptors is yet to be elucidated regarding the link to biological function. This study aims to characterise the expression pattern of melanopsin and vertebrate ancient opsin during early ... -
The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar)
(Master thesis, 2018-06-27)The increased use of plant-based ingredients in aquafeeds for Atlantic salmon has led to an increase in phytate, an antinutrient binding micro minerals and reducing their bioavailability. It has been suggested that the ... -
In vitro bacterial and viral response in head kidney leukocytes of Atlantic salmon (Salmo salar) fed dietary insects meal.
(Master thesis, 2018-06-07)With the fast growth of today’s aquaculture industry, the demand for aqua-feeds is expanding dramatically. Insects, which are part of the natural diet of salmonids, could represent a sustainable ingredient for aquaculture ... -
Neuroendocrine factors involved in appetite control and feed intake in Atlantic salmon (Salmo salar) reared in Recirculating Aquaculture Systems (RAS).
(Master thesis, 2018-11-15)The control of appetite in vertebrates is a complex process that depends on a range of signals from peripheral tissues and neuro- and endocrine signals originating in the brain. The hypothalamus is believed to be the main ... -
Nutritional and environmental impacts on skin and mucus condition in Atlantic salmon (Salmo salar L.)
(Doctoral thesis, 2015-10-09)The skin and associated mucus layer of Atlantic salmon constitutes its first line of defence against the aqueous environment. Through intensive farming, a range of stressors including both mechanical and environmental ... -
Regulation of appetite and growth of Atlantic salmon (Salmo salar L.) and effect of water oxygen, temperature and dietary energy
(Doctoral thesis, 2017-06-27)High water temperature combined with low dissolved oxygen (LO or hypoxia) is one of the most challenging environmental conditions farmed fish experience. The oxygen requirement of fish increases in parallel to this, which ... -
Respiratory burst assay for leukocytter fra Atlantisk laks (Salmo salar L.) og Atlantisk torsk (Gadus morhua L.)
(Master thesis, 2009-06-22)Fagocytose er en viktig funksjon i det uspesifikke immunforsvaret hos fisk, og medvirker til at leukocytter kan drepe infiserende patogener. Leukocytters evne til å ta opp, drepe og bryte ned fagocytterte patogener, er ... -
Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism
(Doctoral thesis, 2016-12-14)In salmon aquaculture, fish occasionally escape from net pens. These domesticated salmon are genetically maladapted for living in natural environments however they still manage to interbreed with wild fish, resulting in ...