Article
Fisheries
Velmurugu Puvanendran, Trilochan Swain, Helge Tveiten, Oyvind J. Hansen, Atle Mortensen
Summary: Larval cod require live prey for growth and survival, and prey concentration and feeding frequency are important factors. Water exchange rates and current also influence prey resident time and larval behavior. High water current induces stress and cortisol levels, while an intermediate rearing protocol leads to better growth and survival.
AQUACULTURE INTERNATIONAL
(2023)
Article
Food Science & Technology
Huilin Yu, Junhui Zhang, Honghao Li, Yan Zhao, Shengyao Xia, Yang Qiu, Jiajin Zhu
Summary: This study found that electron beam irradiation can effectively inactivate SARS-CoV-2 and improve the quality indicators of Atlantic cod, but it also has some effects on the hardness, chewiness, and color of the fish.
Article
Cell Biology
Synne Arstad Bjornestad, Monica Hongro Solbakken, Kjetill S. Jakobsen, Sissel Jentoft, Oddmund Bakke, Cinzia Progida
Summary: Until recently, it was believed that MHC genes and their associated immune components had been conserved since their evolutionary emergence. However, sequencing of the Atlantic cod genome revealed a loss of MHC class II genes and an extreme expansion of MHC class I genes. These findings suggest a possible functional shift from MHC class II to MHC class I.
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
(2023)
Article
Environmental Sciences
A. Gimpel, K. M. Werner, F. -D. Bockelmann, H. Haslob, M. Kloppmann, M. Schaber, V. Stelzenmueller
Summary: Evaluating the ecological effects of offshore wind farm expansion is crucial for understanding socio-ecological trade-offs and informing area-based management. However, little is known about the impact on demersal fish. This study found that wind turbine piles with scour protection can serve as feeding grounds and spawning areas for Atlantic cod, suggesting positive effects on local cod populations and contributing to the urgently needed observational evidence.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Andre S. Bogevik, Elisabeth Ytteborg, Alexander Klevedal Madsen, Ann-Elise Olderbakk Jordal, Odd Andre Karlsen, Ivar Ronnestad
Summary: In this study, polyethylene (PE) microplastics were added to Atlantic cod feeds at 1%, either in their original form or spiked with PCB-126. After a 4-week period, cod fed spiked PE showed a higher concentration of PCB-126 in liver and muscle samples compared to control and fish ingesting virgin PE. The expression of hepatic cyp1a was higher in cod fed spiked PE, indicating an accumulation of PCB-126 in the liver. Moreover, both spiked PE and virgin PE had an effect on the skin, suggesting a reduced skin barrier in fish fed a diet containing PE.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
M. Fernandez-Miguez, V. Puvanendran, E. Burgerhout, P. Presa, H. Tveiten, K. Vorkamp, O. J. Hansen, G. S. Johansson, A. S. Bogevik
Summary: This study evaluated the effects of feed containing naturally weathered microplastics from the Oslofjord on the reproductive physiology of Atlantic cod. The results showed that microplastics had some effects on the sex hormone levels and enzyme production and function of the fish, but there were no major differences in overall biometrics or gonad histology. These findings suggest that the long-term consequences of microplastics on the ecosystem should be considered.
ENVIRONMENTAL POLLUTION
(2023)
Article
Evolutionary Biology
Bjoerghild Breistein, Geir Dahle, Torild Johansen, Francois Besnier, Maria Quintela, Per Erik Jorde, Halvor Knutsen, Jon-Ivar Westgaard, Kjell Nedreaas, Eva Farestveit, Kevin Alan Glover
Summary: This study examines the population genetic structure of coastal Atlantic cod in Norway and finds that the genetically distinct migratory ecotype NEAC plays a major role in shaping the genetic connectivity among populations. Additionally, there is limited connectivity between different fjords.
EVOLUTIONARY APPLICATIONS
(2022)
Article
Fisheries
Marit Bjornevik, Albert K. D. Imsland, Henriette Hanssen, Bjorn Roth, Erik Vikingstad, Atle Foss
Summary: This study found that alternate day feeding of Atlantic cod can significantly increase weight gain and improve feed conversion ratio, while reducing feed consumption. Feeding on alternate days can greatly reduce feeding costs without compromising biomass growth.
AQUACULTURE NUTRITION
(2021)
Article
Immunology
Verena Mertes, Alexander Kashulin Bekkelund, Leidy Lagos, Elia Ciani, Duncan Colquhoun, Hanne Haslene-Hox, Havard Sletta, Henning Sorum, Hanne Cecilie Winther-Larsen
Summary: The study tested isolated membrane vesicles as potential vaccine candidates for francisellosis in fish, but did not observe protective immunity in Atlantic cod and tilapia after vaccination. Further research is needed to understand the development of immunological memory in different fish species.
Article
Fisheries
Velmurugu Puvanendran, Oyvind J. Hansen
Summary: Studies have shown the negative short-term effects of early weaning on finfish larvae, but the information on its long-term effects on growth and economic loss is lacking. This study evaluated the short- and long-term effects of early weaning and late weaning on Atlantic cod, and found that late weaned fish showed significantly higher body weight at 30 months post-hatch compared to early weaned fish. A cost analysis indicated substantial financial benefit for commercial cod farming by using late weaning. Thus, it is recommended to use late weaning in order to gain considerable economic profit.
Article
Fisheries
V. Puvanendran, I. Rud, M. S. W. Breiland, J. A. Arnesen, L. Axelsson
Summary: The study demonstrated that feeding Atlantic cod larvae with two Carnobacterium divergens strains significantly improved growth, survival, and disease resistance. The enrichment of carnobacteria in the feed did not significantly impact the overall microbiota diversity or composition. Despite this, the probiotic treatment positively affected the performance and welfare of cod larvae.
Article
Food Science & Technology
Sunniva Hoel, Jorgen Lerfall, Anita Nordeng Jakobsen
Summary: This study assessed the growth and spoilage potential of Aeromonas bacteria in Atlantic cod fillets under different modified atmospheres. The results showed that atmospheres containing CO2/O2 or CO2/N2 significantly inhibited bacterial growth, while vacuum packaging promoted growth. Inoculation with bacteria did not significantly affect spoilage metabolite production.
Article
Biochemistry & Molecular Biology
Velmurugu Puvanendran, Erik Burgerhout, Oivind Andersen, Matthew Kent, Oyvind Hansen, Torstein Tengs
Summary: We used material from Norway's National Cod Breeding Program to study the effects of different early life-stage temperature regimes on DNA methylation and gene expression. Long-term effects were observed in both fish sampled weeks after the end of differential treatments and offspring from different exposure groups. The study revealed overlapping genes and genes associated with differential CpG methylation levels, including those involved in muscle fibre development, metabolic processes, formation of deformities, and intergenerational transfer of epigenetic marks. The study suggests that utilizing environmental cues can enhance the production of Atlantic cod.
Article
Agriculture, Multidisciplinary
Xue Hanyue, Fei Yanjin, Wang Shihui, Lili Yao, Xiong Xiong, Yang Ying
Summary: This study developed a novel loop-mediated isothermal amplification (LAMP) assay for Atlantic cod authentication. The assay demonstrated high specificity and applicability, capable of detecting as little as 1 pg of Atlantic cod DNA and detecting cod adulteration as low as 10%. No cross-reactivity was observed.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2023)
Article
Chemistry, Applied
Yaqi Zhao, Xingyi Jiang, Chunya Tang, Qinchun Rao
Summary: In this study, tropomyosin from Atlantic cod fillets was purified and its structural configuration and antigenicity under different conditions were investigated. The results showed that CTM retained solubility, integrity, and antigenicity.
Article
Fisheries
Esther Savina, Bent Herrmann, Rikke P. Frandsen, Ludvig A. Krag
Summary: This paper presents a new method for estimating the length-dependent fish capture modes in gillnets. The study focused on cod in commercial monofilament nylon gillnets and found that the capture modes were dependent on fish size. The findings have implications for improving gear selectivity and efficiency.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Oceanography
Jesse Brinkhof, Roger B. Larsen, Bent Herrmann
Summary: This study compared the size selectivity and catch efficiency of two diamond-meshed codends turned 90 degrees (T90) with two different mesh sizes (135 and 145 mm) with those of a sorting grid followed by a diamond-mesh codend. The results showed that using a diamond-mesh codend is a more advantageous alternative to the sorting grid method in terms of catch efficiency and selectivity.
OCEAN & COASTAL MANAGEMENT
(2022)
Article
Multidisciplinary Sciences
Elsa Cuende, Manu Sistiaga, Bent Herrmann, Luis Arregi
Summary: This study examines the size selectivity and catch patterns of different gear combinations in the Basque bottom trawl fishery. The results demonstrate the significant impact of design changes in square mesh panels and codends on the size selectivity and catch patterns of hake and blue whiting. The study suggests prioritizing research on codend size selectivity and the addition of selection devices once good selective properties are achieved.
Article
Oceanography
Y. E. Fakioglu, H. Ozbilgin, G. Gokce, B. Herrmann
Summary: The study aimed to modify bottom trawl fishing gears to reduce the bycatch of slow-growing marine species such as rays and skates. Sea trials showed that the modified gear significantly reduced the capture probability of guitarfish and stingrays compared to the standard gear. The results for spiny butterfly ray were inconclusive. For most target species, there was no significant reduction in catch efficiency when using the modified gear, except for common sole. The technical measure of modifying bottom trawl gears has the potential to be an efficient and cost-effective way to reduce unwanted bycatch.
OCEAN & COASTAL MANAGEMENT
(2022)
Article
Oceanography
Juan Santos, Daniel Stepputtis, Daniel Oesterwind, Bent Herrmann, Uwe Lichtenstein, Constanze Hammerl, Uwe Krumme
Summary: This study developed and tested a simple roofless design concept to reduce cod bycatch in flatfish-directed trawl fisheries. The baseline roofless design consistently reduced cod bycatch by about 75%, with minimal impact on the catch of the target species flounder and plaice. The use of the baseline roofless concept could significantly increase fishing possibilities for flatfish.
OCEAN & COASTAL MANAGEMENT
(2022)
Article
Agriculture, Dairy & Animal Science
Niels Madsen, Rasmus Ern, Aage Kristian Olsen Alstrup
Summary: This paper focuses on the importance of discard survival studies (DSS) in EU fisheries and how to comply with animal welfare regulations in experiments. The field of DSS is influenced by animal research welfare requirements and is expected to become more restrictive in the future due to growing public concern for fish welfare.
Article
Environmental Sciences
Andrea Petetta, Bent Herrmann, Massimo Virgili, Daniel Li Veli, Jesse Brinkhof, Alessandro Lucchetti
Summary: The study found that design changes that work for the codend of bottom trawls do not necessarily work for other parts of the trawl, and may even have negative effects.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Ecology
Bent Herrmann, Kristine Cerbule, Jure Brcic, Eduardo Grimaldo, Maxime Geoffroy, Malin Daase, Jorgen Berge
Summary: Measures of biodiversity are crucial for monitoring ecosystems. Marine faunal biodiversity is often quantified using samples collected through trawling. To track changes in biodiversity, samples are collected from multiple stations. Estimation of biodiversity indices must account for spatial-temporal variation and uncertainty in sample size. The nested bootstrapping method presented here addresses these uncertainties and allows for inference of biodiversity changes.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2022)
Article
Fisheries
Bjorn A. Krafft, Andrew Lowther, Ludvig A. Krag
Summary: Bycatch of nontarget species is a significant issue in the Antarctic krill fishery, and understanding its importance and diversity is crucial for managing this key species. Observer coverage is high, and bycatch levels are generally low across gear types.
FISHERIES MANAGEMENT AND ECOLOGY
(2023)
Article
Fisheries
Bjorn Arne Krafft, Ludvig A. Krag, Ronald Pedersen, Egil Ona, Gavin Macaulay
Summary: This study demonstrates the potential for using acoustically based monitoring to estimate catch weight in the Antarctic krill fishery. The results show a linear relationship between acoustically estimated catch weight and observed catch weight, indicating that this method could be used for real-time reporting in similar trawl fisheries.
FISHERIES MANAGEMENT AND ECOLOGY
(2023)
Article
Fisheries
G. Skaret, G. J. Macaulay, R. Pedersen, X. Wang, T. A. Klevjer, L. A. Krag, B. A. Krafft
Summary: Antarctic krill is a vital species in the Southern Ocean and is heavily fished in the Antarctic. The Norwegian Institute of Marine Research has been monitoring krill population using acoustic-trawl methods near the South Orkneys since 2011, and the results show consistently high krill densities in this region. There has been no significant trend in estimated krill biomass over the past 10 years. The study also suggests that the management of the krill fishery in the South Orkneys region is cautious.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Environmental Sciences
Ercan Avsar, Jordan P. Feekings, Ludvig Ahm Krag
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Marine
Eduardo Grimaldo, Bent Herrmann, Enis N. Kostak, Jesse Brinkhof
Summary: A major challenge for the aquaculture sector is finding sustainable and cost-effective raw materials for feed. This study aimed to develop a more energy-efficient and efficient trawl for harvesting zooplankton. The results showed that the filtration efficiency of the net increased with increasing flow velocity and decreasing solidity and taper angle.
Article
Oceanography
Junita D. Karlsen, Ludvig Ahm Krag, Bent Herrmann
Summary: Fisheries management is transitioning from a single-species approach to an ecosystem-based approach to address the complexities of mixed-species fisheries. A dual compartment codend concept can provide a complex selectivity profile and allow for flexible adjustments at sea, improving compliance with management objectives.
OCEAN & COASTAL MANAGEMENT
(2024)
Article
Green & Sustainable Science & Technology
Giovanni Codotto, Massimo Pizzol, Troels J. Hegland, Niels Madsen
Summary: The results of life cycle assessment (LCA) studies are influenced by modeling choices and data used. This study investigates the combined effect of modeling choices and variability on the uncertainty of LCA results of fish products.
JOURNAL OF INDUSTRIAL ECOLOGY
(2023)
Article
Fisheries
Miguel Petrere Jr, Davi Butturi-Gomes
Summary: This short communication aims to raise awareness about the misuse of confidence intervals in Ecology and Fisheries statistical models that ignore the lack of independence.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Peter-John F. Hulson, Benjamin C. Williams
Summary: This study evaluates the impact of considering ageing error and growth variability on the determination of input sample size (ISS) in statistical catch-at-age assessment models. The results show that including these sources of uncertainty decreases the ISS determined through bootstrap methods. This indicates that there is more variability in age composition and conditional age-at-length data than previously accounted for. Including these sources of uncertainty improves the estimation of ISS and subsequently improves the quality of stock assessment models.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Jason M. Cope
Summary: Fishery resource assessment is a complex and challenging task, but with the use of different analysis methods and tools, effective management guidance can be provided even with limited data and resources.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Regina L. Cunha, Joana I. Robalo, Sara M. Francisco, Ines Farias, Rita Castilho, Ivone Figueiredo
Summary: Recent advances in genomics have greatly contributed to the assessment of fish stocks by providing precise identification of genetic boundaries. This study used a genotyping-by-sequencing approach to reveal the existence of an additional genetic cluster of blackspot seabream in the northeast Atlantic, which was not previously identified. Factors such as ocean circulation patterns and local upwelling may play a role in the genetic differentiation observed in this study.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Huihua Lee, Mark N. Maunder, Kevin R. Piner
Summary: Estimating growth is important for fish population assessment. Integrated assessment models and the influence of misfitting size composition data have renewed interest in how growth is modeled. The available data types control how the length-at-age relationship is estimated. Estimating length-at-age is complex due to multiple sources of biological variability and difficulties in obtaining representative samples.
FISHERIES RESEARCH
(2024)
Article
Fisheries
A. Ladino, I. Perez-Arjona, V. Espinosa, M. Chillaron, V. Vidal, L. M. Godinho, G. Moreno, G. Boyra
Summary: This study examines the acoustic properties of skipjack tuna and Atlantic mackerel, both bladderless pelagic fish species, and explains the significant differences observed. The research shows that the differences in material properties of their tissues predict a more than 10 dB greater reduced target strength in skipjack compared to mackerel at certain frequencies.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Nelly Pena-Cutimbo, Cristel Cordero-Maldonado, Clara Ortiz-Alvarez, Joanna Alfaro-Shigueto, Jeffrey C. Mangel
Summary: Bycatch is a global problem for marine megafauna. This study assessed the bycatch interactions of the Peruvian artisanal purse-seine fishery in 2019 and found that all taxa groups were affected by bycatch. Dusky dolphins, guanay cormorants, and eagle rays were the most frequently reported bycatch species.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Jen-Ming Liu, Po-Yuk So
Summary: The set-net fishery is an environmentally friendly fishery posing little risk to the marine ecosystem. This study identified ocean temperature, sea surface factors, and climatic factors as the main factors affecting the installation of set-nets.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Josie L. Palmer, Carina Armstrong, Hasan D. Akbora, Damla Beton, Cigdem Caglar, Brendan J. Godley, Kristian Metcalfe, Meryem Ozkan, Robin T. E. Snape, Annette C. Broderick
Summary: Small-scale fisheries are vital for global food security and cultural heritage, but the lack of information hampers effective management and mitigation of ecological impacts. This study provides the first comprehensive overview of the small-scale fishery fleet in Northern Cyprus. The fleet operates mainly over the continental shelf, using static and demersal gear types, and catches a diverse range of species, some of which are threatened. The findings can be used to improve fisheries management and conservation measures.
FISHERIES RESEARCH
(2024)
