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norskArtikler, rapporter og annet (Norges fiskerihøgskole)
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Understanding size selectivity of trawls using structural models: Methodology and a case study on fish sorting grids
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-27)Fish behaviour affects the performance of selection devices in fishing gears. Traditionally, fish behaviour in relation to selection devices is assessed by direct observation. However, this approach has limitations, and the observations are not explicitly incorporated in the selectivity models. Further, underwater observations and quantification of fish behaviour can be challenging. In this study ... -
Abandoned, lost, or otherwise discarded fishing gear in coastal fisheries: A case study in the Baltic Sea coastal waters of Latvia
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-29)Abandoned, lost, or otherwise discarded fishing gear (ALDFG) is considered a problem of global concern which can cause considerable negative environmental and socioeconomic consequences. Due to use of slowly degrading plastic materials in fishing gear construction, ALDFG can remain in marine environment for decades. Enclosed marine environments are particularly vulnerable for all types of pollution ... -
Trade-off between drag and catch performance when designing zooplankton trawls
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-10)The aquaculture sector is in pursuit of sustainable and cost-effective raw materials for feed, and the copepod Calanus finmarchicus is a marine zooplankton species of commercial interest because of its high abundance in northern areas. These copepods have the potential to meet the demand for vast quantities of marine raw materials. However, the lack of an energy- and catch-efficient trawl technology ... -
Atlantic salmon type I interferon genes revisited
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-12)Type I interferons (IFN–I) play a pivotal role in vertebrate innate immunity against viruses. This study is an analysis of IFN-I genes in an updated version of the Atlantic salmon genome published in 2021 (version Ssal_v3.1), revealing 47 IFN-I genes in the Atlantic salmon genome. The GH1 locus of chromosome (Chr) 3 harbors 9 IFNa genes, 5 IFNb genes, 6 IFNc genes, 11 IFNe genes and 1 IFNf gene. ... -
Walking sideways? Management of the Norwegian snow crab fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-03)The snow crab (Chionoecetes opilio) in the Barents Sea is an invasive species, first discovered in 1997. Since 2012, a commercial fishery has developed, and various management measures have been implemented. Despite fishing gear restrictions, limits for the catch season and the implementation of a TAC-regime in 2017 onwards, the fishery struggles with substantial sustainability challenges. ... -
Taxonomic accuracy and complementarity between bulk and eDNA metabarcoding provides an alternative to morphology for biological assessment of freshwater macroinvertebrates
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-16)Determining biological status of freshwater ecosystems is critical for ensuring ecosystem health and maintaining associated services to such ecosystems. Freshwater macroinvertebrates respond predictably to environmental disturbances and are widely used in biomonitoring programs. However, many freshwater species are difficult to capture and sort from debris or substrate and morphological identification ... -
Declining calcium concentration drives shifts toward smaller and less nutritious zooplankton in northern lakes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-03)Zooplankton community composition of northern lakes is changing due to the interactive effects of climate change and recovery from acidification, yet limited data are available to assess these changes combined. Here, we built a database using archives of temperature, water chemistry and zooplankton data from 60 Scandinavian lakes that represent broad spatial and temporal gradients in key parameters: ... -
3D imaging shows nano- and microparticles are internalized by salmon skin and corneal epithelial cells
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-18)The rising problem of plastic pollution is becoming one of the major environmental issues for the world. In the ocean, plastics undergo degradation into smaller microplastics (MPs) and nanoplastics (NPs). Wild fish and farmed salmon would likely be exposed to these NPs and MPs both through skin and through skin wounds. Keratocyte cells, located in the skin epithelial layer, are scavenger cells which ... -
Exploring land use conflicts arising from economic activities andtheir impacts on local communities in the European Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-30)The European Arctic is commonly thought of as a pristine and homogeneous area. In reality, it is a diverse region experiencing growth relying on natural resource extraction. Despite local communities being primarily affected by industry activities, most socioeconomic impact assessments are conducted at the macro level. This study addresses this gap by examining the impacts of economic activities ... -
Insights into the nature of ichthyotoxins from the Chrysochromulina leadbeateri blooms in Northern Norwegian fjords
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-20)In May–June 2019, the microalga Chrysochromulina leadbeateri caused a massive fish-killing event in several fjords in Northern Norway, resulting in the largest direct impact ever on aquaculture in northern Europe due to toxic algae. Motivated by the fact that no algal toxins have previously been described from C. leadbeateri, we set out to investigate the chemical nature and toxicity of secondary ... -
Soundscape characteristics of RAS tanks holding Atlantic salmon (Salmo salar) during feeding and feed withdrawal
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-03)Behavioural monitoring can provide crucial information on welfare and feeding in aquaculture. Passive acoustic monitoring of behaviour can be particularly useful in recirculating aquaculture systems (RAS), as they often have turbid water that impairs visual monitoring. Currently, little is known about the sounds that make up the soundscapes in RAS tanks holding Atlantic salmon (Salmo salar). ... -
Inflammatory responses in Atlantic lumpfish (Cyclopterus lumpus L.) after intraperitoneal injection of a vaccine against Aeromonas salmonicida and Vibrio salmonicida at different water temperatures
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-16)Studying inflammatory responses induced by vaccination can contribute to a more detailed understanding of underlying immune mechanisms in lumpfish (Cyclopterus lumpus). Tissue samples from lumpfish intraperitoneally immunized with a divalent oil-adjuvanted vaccine (Aeromonas salmonicida and Vibrio salmonicida) at water temperatures of 5, 10, and 15°C were collected at 630 day degrees and 18 weeks ... -
Hack it with EDUCHIC! educational hackathons and interdisciplinary challenges—Definitions, principles, and pedagogical guidelines
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-17)Whereas hackathons are widespread within and outside academia and have been argued to be a valid pedagogical method for teaching interdisciplinarity, no detailed frameworks or methods are available for conceptualizing and organizing educational hackathons, i.e., hackathons dedicated to best achieving pedagogic objectives. This paper is dedicated to introducing EDUCational Hackathons for learning ... -
Effect on catch efficiency and bycatch by introducing an Excluder device in the trawl fishery for lesser sandeel (Ammodytes marinus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-31)Sampling of the North Sea trawl fishery for lesser sandeel (Ammodytes marinus) showed that 96% of the catch weight consisted of the target species, and experimental sea trials demonstrated that the observed small bycatch percentages of haddock (Melanogrammus aeglefinus), mackerel (Scomber scombrus) and grey gurnard (Eutrigla gurnardus) could be significantly lowered by inserting a netting-based ... -
Virus-specific antibody secreting cells reside in the peritoneal cavity and systemic immune sites of Atlantic salmon (Salmo salar) challenged intraperitoneally with salmonid alphavirus
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-08)The development and persistence of antibody secreting cells (ASC) after antigenic challenge remain inadequately understood in teleosts. In this study, intraperitoneal (ip) injection of Atlantic salmon (Salmo salar) with salmonid alphavirus (WtSAV3) increased the total ASC response, peaking 3–6 weeks post injection (wpi) locally in the peritoneal cavity (PerC) and in systemic lymphoid tissues, ... -
Observing fish behavior in towed fishing gear—is there an influence of artificial light?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-29)Fish behavior is important to consider when developing selective fishing gear. In studies designed to investigate the size selective properties of towed fishing gears such as trawls, fish behavior is mainly documented by underwater video recordings. Because fishing gear can be operated at great depths or in other low light environments, artificial light is often required for underwater recordings. ... -
Exploring temporal activity of dholes, their prey, and competitors in East Java, Indonesia
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-04)Dholes (Cuon alpinus) are endangered large carnivores found in scattered populations in Asia. One of the main threats to dholes is the decreasing prey availability throughout their distribution range. In the present study, we used camera trap data collected over 6 years to investigate the temporal activity patterns of dholes and their putative prey species in Baluran National Park in Java, Indonesia. ... -
Are rigid sorting devices necessary to control size selectivity in demersal trawl fisheries?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-27)Diamond mesh codends are the most common size selectivity devices in trawls for releasing bycatch and undersized individuals. However, codend selectivity can vary due to the flexibility of the netting meshes, making discrimination by size between retained and released fish difficult to control. In some trawl fisheries, rigid sorting devices have been introduced to make size selection more controlled ... -
Stakeholders' perception and willingness-to-pay for an aquaculture-based fisheries enhancement program for coastal cod in Southern Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-23)he coastal cod fishery in Southern Norway has experienced a significant decline over the last decades. Recre ational fishing for cod in the eastern part of the country is currently banned. Fisheries managers have adopted a variety of strategies to sustain the populations for resource users. Aquaculture-based fisheries enhancement has been considered as an alternative intervention to rebuild ... -
Community dynamics and metagenomic analyses reveal Bacteroidota's role in widespread enzymatic Fucus vesiculosus cell wall degradation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-03)Enzymatic degradation of algae cell wall carbohydrates by microorganisms is under increasing investigation as marine organic matter gains more value as a sustainable resource. The fate of carbon in the marine ecosystem is in part driven by these degradation processes. In this study, we observe the microbiome dynamics of the macroalga Fucus vesiculosus in 25-day-enrichment cultures resulting in ...
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