I denne studien ble de fire komponentsamfunnene av tarmparasitter hos ørret og røye sammenlignet i de nærliggende innsjøene Takvatn og Fjellfroskvatn i Troms. I førstnevnte innsjø finnes i tillegg stingsild. Totalt 100 ørret og 90 røye ble undersøkt på ettersommeren 2018. Alle tarmparasittene ble registrert hos ørret og røye i begge innsjøene, unntatt ørretmark og røyemark som infiserte henholdsvis ...

Lumpfish (<i>Cyclopterus lumpus</i> L.) in Norway is currently produced in traditional flow-through systems (FTS). Hatcheries frequently show signs of bacterial infections, unstable microbial communities in the rearing water and varying mortality. Recirculating aquaculture systems (RAS) is proposed to create stable and healthy microbial environments, with less probabilities for blooming of opportunistic ...

Modern speciation theory has greatly benefited from a variety of simple mathematical models focusing on the conditions and patterns of speciation and diversification in the presence of gene flow. Unfortunately the application of general theoretical concepts and tools to specific ecological systems remains a challenge. Here we apply modeling tools to better understand adaptive divergence of whitefish ...

Among the complex ecosystems and habitats that form the deep sea, submarine canyons and open slope systems are regarded as potential hotspots of biodiversity. We assessed the spatial and temporal patterns of biodiversity in sediment communities of a NW Mediterranean Canyon and its adjacent open slope (Blanes Canyon) with DNA metabarcoding. We sampled three layers of sediment and four different depths ...

<i>Mycobacterium marinum</i> is a promiscuous pathogen infecting many vertebrates, including humans, whose persistent infections are problematic for aquaculture and public health. Among unsettled aspects of host–pathogen interactions, the respective roles of conventional and innate-like T (iT) cells in host defenses against <i>M. marinum</i> remain unclear. In this study, we developed an infection ...

Microalgae have been shown to be excellent producers of lipids, pigments, carbohydrates, and a plethora of secondary metabolites with possible applications in the pharmacological, nutraceutical, and cosmeceutical sectors. Recently, various microalgal raw extracts have been found to have anti-inflammatory properties. In this study, we performed the fractionation of raw extracts of the diatom ...

Fishing trials targeting several invasive swimming crab species in their native habitat were undertaken using two types of collapsible pot, one with open-eyed entrances and the other with closed-eyed entrances, to analyse differences in catch retention between them. The open-eyed pot was dome-shaped with two funnel entrances located at opposite ends, whereas the closed-eyed pot had two soft sleeves ...

The Arctic will be especially affected by climate change, resulting in altered seasonal timing. Anadromous Arctic char (<i>Salvelinus alpinus</i>) is strongly influenced by sea surface temperature (SST) delimiting time periods available for foraging in the sea. Recent studies of salmonid species have shown variation at phenology‐related loci associated with timing of migration and spawning. We ...

This study investigates the labour on a Norwegian trawler through the study of tasks that are performed under the trawling operation. Study of tasks is one of the fundamental approaches to studying labour, and in this thesis, it is carried out using the technique of Hierarchical Task Analysis. This task analysis technique has been broadly and universally used in different industries for over 60 ...

Climate change has an inevitable natural impact on fisheries. Continually, several models made of both biological and economic factors are used to measure the effects of climate change on fish stocks. This study has as its objective to identify how climate change effect through carrying capacity affects the productivity and profitability of the cod stock in the Barents Sea. Two scenarios one with ...