En stadig økende verdensbefolkning og etterspørsel etter sjømat, har bidratt til at akvakulturnæringen har stått ovenfor en betydelig vekst de siste 30 årene. Parallelt har behovet for fôr og fôringredienser økt. Dagens villfiskbestander er allerede fullt utnyttet, og andelen av de høyverdige råvarene fiskemel og fiskeolje er begrenset til bruk i fôrproduksjon på grunn av stagnering i fiskeriene. ...

I dag er verdikjeden for fisk og skalldyr bygget opp rundt utnyttelse av et fåtall arter som kan fanges i store volum og med høy markedsverdi. Bruk av lite eller ikke utnyttede marine ressurser kan være en bærekraftig tilnærming for å innfri fremtidige krav og etterspørsel til fiskekonsum. Rødspette (Pleuronectes platessa) er den viktigste flatfisken i volum og verdi i europeiske fiskerier. Både ...

Kystnære fiskebestander har blitt høstet av siden mennesker bosatte seg langs kysten. Effektiviseringen av fiskeflåten og økt menneskelig aktivitet i kystsonen og til havs, har ført til at tiltak for å bevare fiskebestander er blitt innført. De senere tiårene har synet på forvaltning blitt mer helhetlig, fordi forskere, fiskere, organisasjoner, med mer, begynte å se verdien av å ivareta hele økosystem ...

Landings of Atlantic halibut (Hippoglossus hippoglossus) have increased significantly in later years. More fishing boats are joining the open-access fishery, with an ever-increasing number of fishing gear. The Atlantic halibut is also a popular tourist and recreational fishery target species. Atlantic halibut is a large, late-maturing flatfish with life history traits that make the stock sensitive ...

The Atlantic salmon (Salmo salar L.) is a commercially important species that exhibits an anadromous life cycle involving migratory movements between freshwater and marine environments. Understanding the fundamental biology of the Atlantic salmon, particularly during key life history transitions such as smoltification, is therefore of great importance. In light of modern biotechnology and the completed ...

Seasonal coat colour moulting species moult to white winter fur for crypsis in snow-covered landscapes. Seasonal coat colour moulting occurs in birds and mammals; some are colour polymorphic; one of which is the arctic fox (Vulpes lagopus), having a blue and white colour morph. Camouflage, thermoregulation and physiology likely contributed to the evolution of this polymorphism. Climate change is ...

Secondary production was estimated at the Polar Front in 2022 using optical sampling techniques to sample zooplankton, growth rates computed with semi-emprical equations and egg production of Calanus spp. was also estimated.

Climate warming induces poleward distributional shifts of boreal species in Arctic regions resulting in compositional changes with poorly understood consequences for Arctic food-webs. This thesis addresses the spatial variation in Barents Sea food-webs using previously compiled distributional data in polygons specified for the Nowegian and Barents Sea NoBa Atlantis model and a highly resolved Barents ...

It has in recent years been a shift in the land-based aquaculture production from flow through systems (FTS) to recirculating aquaculture systems (RAS). With emerging use of RAS, it is necessary with knowledge regarding potential issues, whereas one potentially increasing problem is accumulation of microplastics (MP) in the RAS water. The objects of this study were to determine MPs concentration in ...

The Earth is in constant movement around the Sun – this has created environments with changing light throughout the day and year. Through evolution animals have adapted to this change in light and circadian and circannual rhythms have evolved to enhance fitness and survival. Animals living in the Arctic region have a different relationship to light changes as for several months a year the Sun ...