Artikler, rapporter og annet (Norges fiskerihøgskole): Recent submissions
Now showing items 181-200 of 1012
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Escape panels in trawls: does placement matter when every individual contacting the panel can escape?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-12)Escape panels are one of the bycatch reduction devices most used in trawl fisheries but their efficiency rely on fish actively contacting the panel to escape. To investigate if contact behaviour changes at different panel placements, we tested a 300 mm square mesh panel placed in the upper panel of the codend at 3, 4 and 7 m from the codline. Seven competing models of contact probability were fitted ... -
Used vs. new: Does it have consequences for the performance of fishing gear?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-06)Sea trials to test size selectivity equipment in trawls are often limited in time because they are costly, and the results can be influenced by multiple factors that are often overlooked. In the Barents Sea gadoid trawl fishery, the use of a size sorting grid in front of the codend is compulsory. The flexigrid, a netting section containing two flexible grids, is the most widely used grid section in ... -
B-1 plasma cells require non-cognate CD4 T cell help to generate a unique repertoire of natural IgM
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023)Evolutionarily conserved, “natural” (n)IgM is broadly reactive to both self and foreign antigens. Its selective deficiency leads to increases in autoimmune diseases and infections. In mice, nIgM is secreted independent of microbial exposure to bone marrow (BM) and spleen B-1 cell–derived plasma cells (B-1PC), generating the majority of nIgM, or by B-1 cells that remain non-terminally differentiated ... -
CALANGO: A phylogeny-aware comparative genomics tool for discovering quantitative genotype-phenotype associations across species
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-09)Living species vary significantly in phenotype and genomic content. Sophisticated statistical methods linking genes with phenotypes within a species have led to breakthroughs in complex genetic diseases and genetic breeding. Despite the abundance of genomic and phenotypic data available for thousands of species, finding genotype-phenotype associations across species is challenging due to the ... -
Geographic variation in the life history of lane snapper Lutjanus synagris, with new insights from the warm edge of its distribution
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-20)Research on life-history variations in widely distributed fish species is needed to understand global warming impacts on populations and to improve fisheries management advice. The lane snapper Lutjanus synagris (Linnaeus, 1758) is commercially important to fisheries in the Western Central Atlantic, where spread information on its life-history traits is available. We studied growth, age, reproduction ... -
Molecular tools prove little auks from Svalbard are extremely selective for Calanus glacialis even when exposed to Atlantification
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-22)Two Calanus species, C. glacialis and C. finmarchicus, due to different life strategies and environmental preferences act as an ecological indicators of Arctic Atlantification. Their high lipid content makes them important food source for higher trophic levels of Arctic ecosystems including the most abundant Northern Hemisphere's seabird, the little auk (Alle alle). Recent studies indicate a critical ... -
Characterization of myeloperoxidase and its contribution to antimicrobial effect on extracellular traps in flounder (Paralichthys olivaceus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-26)Myeloperoxidase (MPO) is a cationic leukocyte haloperoxidase and together with other proteins, they possess activities against various microorganisms and are involved in extracellular trap (ET) formation. The present work describes the gene and deduced protein sequences, and functions of MPO in flounder (PoMPO). The PoMPO possesses a 2313 bp open reading frame (ORF) that encodes a protein of 770 ... -
Beneficial roles of nutrients as immunostimulants in aquaculture: A review
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-21)Protein deficiency is a major difficulty for human needs in the past few decades, while different types of aquatic species are rich in high quality protein. Therefore, aquaculture is considered as the main developing food production sector globally. Bacterial infections are the main problem for aquaculture, and their outbreaks have a great impact on productivity, and previously indiscriminate use ... -
Increasing sustainability in food production by using alternative bait in snow crab (Chionoecetes opilio) fishery in the barents sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-17)The use of food grade wild-captured species as bait for other fisheries questions the sustainability of food production. In pot fisheries, bait is an important factor determining the effectiveness of the gear. In snow crab (Chionoecetes opilio) fishery, the pots are normally baited with squid (Illex sp.) and herring (Clupea harengus). This fishery uses substantial amounts of bait for each ... -
Certify or not? The effect of the MSC certification on the ex-vessel prices for Atlantic cod in Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-19)There is strong evidence that ecolabeled seafood commands a price premium in the retail market in Northern European countries. At the same time, there is significant uncertainty as to whether these markups are passed on to the fishers. This is important because producer benefits are required for an ecolabel to provide incentives for sustainable fishery management and fishing practices. Therefore, ... -
Algal amendment enhances biogenic methane production from coals of different thermal maturity
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-10)The addition of small amounts of algal biomass to stimulate methane production in coal seams is a promising low carbon renewable coalbed methane enhancement technique. However, little is known about how the addition of algal biomass amendment affects methane production from coals of different thermal maturity. Here, we show that biogenic methane can be produced from five coals ranging in rank ... -
Conservation of Genomic Information in Multiple Displacement Amplified Low-Quantity Metagenomic Material from Marine Invertebrates
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-02)Marine invertebrate microbiomes have been a rich source of bioactive compounds and interesting genomic features. In cases where the achievable amounts of metagenomic DNA are too low for direct sequencing, multiple displacement amplification (MDA) can be used for whole genome amplification. However, MDA has known limitations which can affect the quality of the resulting genomes and metagenomes. ... -
Every animal matters! Evaluating the selectivity of a Mediterranean bottom trawl fishery from a species community perspective
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-23)Bottom trawl fisheries often catch several species simultaneously. However, most studies addressing the catch performance and selectivity of a specific trawl focus on a few commercially important or most vulnerable species requiring management measures. By contrast, the present study considers the multispecies nature of Mediterranean bottom trawl fisheries through a holistic approach that accounts ... -
Use of biodegradable materials to reduce marine plastic pollution in small scale coastal longline fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-14)Pollution from lost, abandoned, or discarded fishing gear is recognized as a global nature conservation concern. Longlining with hooks is a commonly applied fishing method in fisheries around the world. The longline gear consists of a mainline with a number of baited hooks that are attached to it by thinner twine (snoods) which are often made of plastic material such as polyamide (nylon) or ... -
Daylight-driven carbon exchange through a vertically structured microbial community
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-26)Interactions between autotrophs and heterotrophs are central to carbon (C) exchange across trophic levels in essentially all ecosystems and metabolite exchange is a frequent mechanism for distributing C within spatially structured ecosystems. Yet, despite the importance of C exchange, the timescales at which fixed C is transferred in microbial communities is poorly understood. We employed a ... -
European marine omics biodiversity observation network: a strategic outline for the implementation of omics approaches in ocean observation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-18)Marine ecosystems, ranging from coastal seas and wetlands to the open ocean, accommodate a wealth of biological diversity from small microorganisms to large mammals. This biodiversity and its associated ecosystem function occurs across complex spatial and temporal scales and is not yet fully understood. Given the wide range of external pressures on the marine environment, this knowledge is crucial ... -
A simple method to isolate fatty acids and fatty alcohols from wax esters in a wax-ester rich marine oil
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-12)Calanus finmarchicus is one of the most important zooplankton species in the North Atlantic. The zooplankton is currently being harvested and industrially processed to a marine oil product for human consumption as a marine nutraceutical containing long-chain omega-3 polyunsaturated fatty acids. This oil is very rich in wax esters, a lipid class where fatty acids are esterified to long chain fatty ... -
Resource competition drives an invasion-replacement event among shrew species on an island
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-08)Invasive mammals are responsible for the majority of native species extinctions on islands. While most of these extinction events will be due to novel interactions between species (e.g. exotic predators and naive prey), it is more unusual to find incidences where a newly invasive species causes the decline/extinction of a native species on an island when they normally coexist elsewhere in their ... -
Roles for advisory science in the International Council for the Exploration of the Sea (ICES)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-12)What role should science take when providing advice in support of policy and politics? Should a provider of science-based advice have its own position on the issues it provides advise on? Or should it be as impartial as possible from the value and policy context of the advice? This theme, long debated, gained new attention in fisheries and marine governance. Starting from theoretical concepts and ... -
A new deep-sea eelpout of the genus Pyrolycus (Teleostei: Zoarcidae) associated with a hydrothermal seep on the Pacific margin of Costa Rica
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-19)A new species of the zoarcid genus Pyrolycus Machida & Hashimoto, 2002, Pyrolycus jaco sp. nov., is described from a hydrothermal seep environment named Jacó Scar in the eastern Pacific of Costa Rica. Four specimens were collected in 2018 between 1746–1795 m among tubeworm colonies around the seep. The new species is differentiated from its two western Pacific congeners by having a shorter head, ...