With rapidly increasing temperatures, reducing ice cover and lower albedo, the physico-chemical conditions in the Arctic fluctuate more than any other place on the planet, especially in the light of the current climate change. This has a severe effect on e.g. Arctic marine eco- systems, which make marine species good indicators, as they are in close contact with environmental gradients. One of which ...

The utilization of algae in aquaculture is environmentally friendly, safe, and cost-effective and can effectively substitute for fish meal and fish oil in aquatic feeds. Incorporating algae as dietary supplements leads to significant enhancements in aquatic animals’ health and also improves the aquatic ecosystem. Algae are rich sources of nutrients and serve as the foundational food source in ...

The feed legislation allows the use of fish protein hydrolysates in feed for the same species in which it came from, since enzymatic hydrolysis degrades the proteins and eliminates potential prions, which have caused disease in mammals, but not in fish. In this trial, we investigated the effects of partially replacing dietary fishmeal (FM) with salmon protein hydrolysate (FPH) on the intestinal gene ...

Mountain hare is a cold-adapted species threatened by climate change, but despite its emblematic nature, our understanding of the causes of population decline remains limited. Camera traps are increasingly used in ecology as a tool for monitoring animal populations at large spatial and temporal scales. In mountain environments where field work is constrained by difficult access and harsh ...

Monitoring programs that integrate both structural and functional ecosystem components play integral roles in ecosystem management and conservation planning. In the early 1990’s, the marine ecosystem of the waters surrounding Newfoundland and Labrador (NL) underwent a regime shift. Several demersal and pelagic fish stocks collapsed simultaneously, and this had significant ecological and socioeconomic ...

Prey metabarcoding has become a popular tool in molecular ecology for resolving trophic interactions at high resolution, from various sample types and animals. To date, most predator–prey studies of small-sized animals (<1 mm) have met the problem of overabundant predator DNA in dietary samples by adding blocking primers/ peptide nucleic acids. These primers aim to limit the PCR amplification ...

Denne masteroppgaven omfatter en analyse av interne og eksterne faktorer som kan påvirke beslutninger knyttet til eksport av norsk torsk til USA. Gjennom en SWOT-analyse vurderes styrker, svakheter, muligheter og trusler for to grupper: importører og eksportører. For å adressere problemstillingen brukes VRIO- og PESTEL-rammeverkene til å identifisere og analysere interne og eksterne faktorer som ...

Økt dødelig i oppdrettsnæringen ansees som et betydelig problem både for omdømme, økonomi og mest av alt for fiskevelferden. Det spekuleres i om nedsatt smoltkvalitet grunnet intensiv drift i settefiskfasen kan være en medvirkende årsak til den økende dødeligheten. Oppdrett av settefisk i RAS kommer med en rekke fordeler, men det er lite studert hvilken påvirkning ulike miljøfaktorer i RAS har for ...

Den store forekomsten av pukkellaks (Oncorhynchus gorbuscha) langs kysten og elvene i Norge har siden 2017 ført til stor oppmerksomhet rundt arten. Det har vært innført flere tiltak for bekjempelse av den invaderende arten, hvor fokuset har vært å forhindre mest mulig fisk i å gyte. Fisken har blitt sett på som et problem, og ikke blitt forvaltet som en potensiell ressurs. Dette studiet ble ...

The epidermal mucus layer of fish covers the entire exterior, including gills and fins. This barrier plays a crucial role in protecting and maintaining the skin heath, while it also reflects the fish’s welfare. The primary aims of this master’s thesis were to develop an in-lab methodology for analyzing fish skin mucus using Matrix Assisted Laser Desorption/ionization Time of Flight Mass Spectrometry ...