Salt content in herring – How the salt content in herring changes during capture and catch handling

Brazil applies a threshold limit value for the amount of salt that is accepted in natural herring, namely 134 mg sodium per 100 g fillet. Compared with the salt content values found in the relevant literature, and the measurements that are routinely performed in Norway, this is a low value that would be difficult to fulfil. RSW (Refrigerated Sea Water) is a quick and appropriate agent for chilling large catches – of herring, for example. However, when fish are stored in RSW after capture, they may assimilate salt from the cooling medium. Another factor that can increase the salt content in herring is stress. When herring are subjected to stress, as happens during capture, the salt content in their blood will increase. All in all, the threshold limit value set for salt content in Brazil is considered to be unrealistically low, taking into account how catches are handled in Norwegian pelagic fisheries. * The original report is in Norwegian and the reference is: 8/2023, ISBN 978-82-8296-743-3Salt content in herring – How the salt content in herring changes during capture and catch handlingpublishedVersio

Early identification of mushy Halibut syndrome with hyperspectral image analysis

Mushy Halibut Syndrome (MHS) is a condition that appears in Greenland halibut and manifests itself as abnormally opaque, flaccid and jelly-like flesh. Fish affected by this syndrome show poor meat quality, which results in negative consequences for the fish industry. The research community has not carefully investigated this condition, nor novel technologies for MHS detection have been proposed. In this research work, we propose using hyperspectral imaging to detect MHS. After collecting a dataset of hyperspectral images of halibut affected by MHS, two different goals were targeted. Firstly, the estimation of the chemical composition of the samples (specifically fat and water content) from their spectral data by using constrained spectral unmixing. Secondly, supervised classification using partial least squares discriminant analysis (PLS-DA) was evaluated to identify specimens affected by MHS. The outcomes of our study suggest that the prediction of fat from the spectral data is possible, but the prediction of the water content was not found to be accurate. However, the detection of MHS using PLS-DA was precise for hyperspectral images from both fillets and whole fish, with lower bounds of 75% and 83% for precision and recall, respectively. Our findings suggest hyperspectral imaging as a suitable technology for the early screening of MHS.Early identification of mushy Halibut syndrome with hyperspectral image analysispublishedVersio

Early identification of mushy Halibut syndrome with hyperspectral image analysis

Mushy Halibut Syndrome (MHS) is a condition that appears in Greenland halibut and manifests itself as abnormally opaque, flaccid and jelly-like flesh. Fish affected by this syndrome show poor meat quality, which results in negative consequences for the fish industry. The research community has not carefully investigated this condition, nor novel technologies for MHS detection have been proposed. In this research work, we propose using hyperspectral imaging to detect MHS. After collecting a dataset of hyperspectral images of halibut affected by MHS, two different goals were targeted. Firstly, the estimation of the chemical composition of the samples (specifically fat and water content) from their spectral data by using constrained spectral unmixing. Secondly, supervised classification using partial least squares discriminant analysis (PLS-DA) was evaluated to identify specimens affected by MHS. The outcomes of our study suggest that the prediction of fat from the spectral data is possible, but the prediction of the water content was not found to be accurate. However, the detection of MHS using PLS-DA was precise for hyperspectral images from both fillets and whole fish, with lower bounds of 75% and 83% for precision and recall, respectively. Our findings suggest hyperspectral imaging as a suitable technology for the early screening of MHS.Early identification of mushy Halibut syndrome with hyperspectral image analysispublishedVersio

Saltinnhold i sild – Hvordan saltinnholdet i sild endres under fangst og fangsthåndtering

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Effect of the T90-codend on the catch quality of cod (Gadus morhua) compared to the conventional codend configuration in the Barents Sea bottom trawl fishery

The aim of this study was to compare the catch quality of Northeast Atlantic cod (Gadus morhua) in the Barents Sea bottom trawl fishery caught using the conventional configuration (a sorting grid followed by a diamond mesh (T0) codend) and a T90° turned mesh codend (T90) without a grid. Twenty hauls were conducted, consisting of 10 hauls with the conventional configuration and 10 hauls with the T90-codend. The catch quality was assessed using the catch-damages-index (CDI) and a newly developed method using VIS/NIR hyperspectral imaging to estimate the residual blood abundances in the fish muscle. The probability of obtaining fish with no damage was 23.4% (CI: 16.3–31.1%) for cod captured by the conventional configuration, and 21.2% (CI: 15.4–27.2%) for cod captured by the T90-codend. The average blood abundance (in arbitrary unit) was 0.86 (CI: 0.85–0.87) for cod captured by the conventional configuration and 0.88 (CI: 0.87–0.88) for cod captured by the T90-codend. Catch quality of the hauls obtained using the two gears did not differ significantly in terms of catch damage or residual blood levels in the cod. Hence, this study demonstrated that T90-codends do not compromise catch quality compared to regular diamond meshed codends.publishedVersio

Damage in step-overs may enable large cascading earthquakes

Seismic hazard analysis relies on the ability to predict whether an earthquake will terminate at a fault tip or propagate onto adjacent faults, cascading into a larger, more devastating event. While ruptures are expected to arrest at fault discontinuities larger than 4–5 km, scientists are often puzzled by much larger rupture jumps. Here we show that material properties between faults significantly affect the ability to arrest propagating ruptures. Earthquake simulations accounting for fault step-over zones weakened by accumulated damage provide new insights into rupture propagation. Revealing that lowered rigidity and material interfaces promote rupture propagation, our models show for the first time that step-overs as wide as 10 km may not constitute effective earthquake barriers. Our results call for re-evaluation of seismic hazard analyses that predict rupture length and earthquake magnitude based on historic records and fault segmentation models

Pilot project for the short-time live storage of bluefin tuna — Trials onboard MS Vestbris 2023

Norway was historically a major bluefin tuna (BFT) harvesting country. However, fishing for this species has experienced low profitability. One potential solution is short-term live-storage so that the market can be supplied on demand. Further, storing BFT allows a more controlled slaughtering of the fish, resulting in better quality and fish welfare. A pilot project was established in 2020 to address knowledge gaps related to BFT live-storage in Norway. This document summarizes the findings from sea trials in 2023.Pilot project for the short-time live storage of bluefin tuna — Trials onboard MS Vestbris 2023publishedVersio

Pilot project for the short-time live storage of bluefin tuna — Trials onboard MS Vestbris 2023

Norway was historically a major bluefin tuna (BFT) harvesting country. However, fishing for this species has experienced low profitability. One potential solution is short-term live-storage so that the market can be supplied on demand. Further, storing BFT allows a more controlled slaughtering of the fish, resulting in better quality and fish welfare. A pilot project was established in 2020 to address knowledge gaps related to BFT live-storage in Norway. This document summarizes the findings from sea trials in 2023.Pilot project for the short-time live storage of bluefin tuna — Trials onboard MS Vestbris 2023publishedVersio

Aspectos do design e da ergonomia informacional para editoração : uma análise dos infográficos da revista Galileu

Orientadora: Joana Gusmão LemosMonografia(Graduação) - Universidade Federal do Paraná,Setor de Ciências Sociais Aplicadas, Curso de Gestão da InformaçãoResumo: O presente estudo tem como objetivo geral analisar os aspectos ergonômicos informacionais nos infográficos presentes na seção "Elementar" das edições de 2015 de umas das mais importantes revistas de divulgação científica do Brasil, a revista Galileu. A Infografia contribui para a Gestão da Informação por ser um recurso informacional que pela sua capacidade de condensação das informações, agrega valor, e torna a informação mais compreensível e acessível para os usuários. O problema de pesquisa delimita-se a partir da seguinte questão: a revista utiliza recursos ergonômicos informacionais em seus infográficos e, especificamente, quais aspectos da Ergonomia da Informação estão sendo utilizados nos infográficos presentes em sua seção "Elementar"? Para responder ao problema, as análises contaram com aporte teórico de estudos da Infografia, Design e Ergonomia da Informação. Utilizou-se de procedimentos metodológicos de pesquisa exploratória descritiva e instrumentos de pesquisa como análise heurística, pesquisa bibliográfica e documental inseridos no método de pesquisa de estudo de caso. A escolha do objeto de estudo se deu pela importância da revista em seu segmento e seu expressivo uso de infográficos em suas edições. Como resultado comprovou-se que os infográficos contidos na seção "Elementar" do ano de 2015 da revista Galileu utilizam aspectos da Ergonomia da Informação. Concluiu-se portanto, que o uso de infográficos para a representação das informações deve ser feito de maneira adequada e por meio de um cuidado com os aspectos ergonômicos informacionais, a fim de contribuir para a compreensão do leito

Levende levert hyse som er kontrollert slaktet gir store fortrinn under prosessering og kjølelagring

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