Ved hjelp av eksperimentelle studier har en undersøkt effekten av ulike miljøfaktorer på gonadevekst hos Drøbak-kråkebolle i oppdrett. Dette inkluderer effekten av temperatur, størrelse, sesong, individtetthet og forskjellige vannkvalitetsparametre (O2, CO2, nitritt, ammoniakk) og håndtering på overlevelse, gonadevekst, fôrinntak og fôrutnyttelse. Optimal temperatur for gonadevekst hos voksne ...

Current knowledge on the feeding ecology of the Greenland shark (<i>Somniosus microcephalus</i>), a potential top predator in arctic marine ecosystems, is based on small sample sizes as well as narrow size ranges of sharks. Therefore, potential size-related feeding patterns remain poorly documented. Using stomach content data (<i>N</i> = 88) and stable isotope values of white muscle tissue (<i>N</i> ...

Polar regions are currently warming at a rate above the global average. One issue of concern is the consequences on biodiversity in relation to the Northward latitudinal shift in distribution of temperate species. In the present study, lasting almost two years, we examined two phenological traits, i.e. the shell growth and behavioural rhythm of a recently re-established species in the high Arctic, ...

The objective of this paper was to compare the growth and gut morphology of juvenile diploid and triploid Atlantic cod (Gadus morhua) reared under similar conditions. Individually tagged 36-week old diploid (mean weight 49.3 ± 13.8 g) and triploid (mean weight 43.6 ± 11.2) juvenile cod were measured at intervals during a 29-weeks growth trial. Data for weight, length, condition factor (K), hepato-somatic ...

Increasing water temperatures from novel climate change may alter freshwater fish life history strategies, especially those of fish populations in northern latitudes. Fish species life history strategies are reflected by their environments and increasing water temperature may alter the most favorable strategies considering growth and reproductive patterns. In this study, life history traits of a ...

The aim of this study was to compare somatic growth and muscle fibre development in diploid and triploid siblings of Atlantic cod (Gadus morhua Linnaeus, 1758) during the larval stage. Newly hatched larvae were transferred into 200-L tanks, three tanks per ploidy group (70 larvae L−1, continuous light, gradually increasing seawater temperature 7–11°C and flow rates 50–117 L h−1). Larvae were fed ...

The purpose of this study was to see if growth and size at maturity were different between a LSR-whitefish morph living in allopatry and one living in sympatry with the DR-morph. Here, I hypothesized that somatic growth in monomorphic LSR-whitefish would be greater. Further, that the age at maturation would be lower for the monomorphic LSR-whitefish than that of the polymorphic LSR-whitefish. As a ...

Global warming has pronounced effects on tundra vegetation, and rising mean temperatures increase plant growth potential across the Arctic biome. Herbivores may counteract the warming impacts by reducing plant growth, but the strength of this effect may depend on prevailing regional climatic conditions. To study how ungulates interact with temperature to influence growth of tundra shrubs across ...

This case study, which uses interventionist action research methodology, first describes key elements of the online business model which was implemented at a business school in Arctic Norway. The aim of the business model intervention was to create a growth in student influx. Next, the study examines the actual impact of the intervention in terms of number of online applicants over the last decade. ...

Målet med dette studiet var å analysere grønlandsselens (Pagophilus groenlandicus) beiting om sommeren i svalbardområdet for 2004, 2005 og 2006. Totalt ble 150 grønlandsseler samt 125 fecesprøver innsamlet i to underområder (øst og vest) i det sørlige svalbardområdet i mai-juni 2004-2006. I 2006 ble det gjennomført ressurskartlegging ved bruk av akustikk og tråling, hvor tråldataene ble benyttet til ...