Now showing items 98-117 of 930

    • A brain and a head for a different habitat: Size variation in four morphs of Arctic charr (Salvelinus alpinus (L.)) in a deep oligotrophic lake 

      Tamayo, Ana-Maria Peris; Devineau, Olivier; Præbel, Kim; Kahilainen, Kimmo Kalevi; Østbye, Kjartan (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-25)
      Adaptive radiation is the diversification of species to different ecological niches and has repeatedly occurred in different salmonid fish of postglacial lakes. In Lake Tinnsjøen, one of the largest and deepest lakes in Norway, the salmonid fish, Arctic charr (<i>Salvelinus alpinus</i> (L.)), has likely radiated within 9,700 years after deglaciation into ecologically and genetically segregated ...
    • Bridging Gaps, Reforming Fisheries 

      Holm, Petter; Hadjimichael, Maria; Mackinson, Steven; Linke, Sebestian (Chapter; Bokkapittel, 2020)
      Scientific debates often revolve around the issues of ‘unbiased science’ with the majority of scientists keeping themselves at arm’s length from policy-making to ensure their credibility. Participatory research has been shifting these dynamics and has led to the emergence of research practices and advice frameworks that allow co-creation of common knowledge bases for management. This chapter, following ...
    • Bridging the Gap: Experiments in the Heart of the Transition Zone 

      Mackinson, Steven; Holm, Petter (Chapter; Bokkapittel, 2020)
      This book is about the on-going transition of fisheries governance and the emergence of research practices and advice frameworks that allow for the co-creation of common knowledge bases for management. This chapter introduces the context under which the GAP project (‘Bridging the gap between science and stakeholders') was conceived, describes its overall approach, orientates the reader to key issues ...
    • A broad-host-range event detector: expanding and quantifying performance between Escherichia coli and Pseudomonas species 

      Khan, Nymul; Yeung, Enoch; Farris, Yuliya; Fansler, Sarah J.; Bernstein, Hans C. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-24)
      Modern microbial biodesign relies on the principle that well-characterized genetic parts can be reused and reconfigured for different functions. However, this paradigm has only been successful in a limited set of hosts, mostly comprised from common lab strains of <i>Escherichia coli</i>. It is clear that new applications such as chemical sensing and event logging in complex environments will benefit ...
    • Broadening the horizon of size selectivity in trawl gears 

      Stepputtis, Daniel; Herrmann, Bent; Mieske, Bernd; Santos, Juan (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-12)
      The discussion of alternative harvest patterns in commercial fisheries has been raised by stock assessment and fishery modelers, especially in the wider context of balanced harvesting. But often, these theoretical approaches propose alternative exploitation patterns that are difficult to achieve within the current limitations in the selectivity characteristics of fishing gears, such as trawl gears. ...
    • Brood‐stock management and early hatchery rearing of Arctic charr (Salvelinus alpinus (Linnaeus)) 

      Olk, Tom Robin; Thorarensen, Helgi Thor; Jeuthe, Henrik; Wollebæk, Jens; Lydersen, Espen (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-02)
      Arctic charr (<i>Salvelinus alpinus</i> (Linnaeus)) is a stenothermic cold‐water fish, which has been cultured in Northern Europe and North America since the 1980s. The industry has remained relatively small with an annual production between 6000 and 10 000 tonnes, and is still challenged by an unreliable offspring production. This review focuses on offspring production in Arctic charr aquaculture ...
    • Building fisheries institutions through collective action in Norway 

      Jentoft, Svein; Finstad, Bjørn-Petter (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-16)
      Institutions, and the collective action that created them and which they enable, can play an important role in poverty eradication. In Norway, the Raw Fish Act passed in 1938 in the aftermath of the international financial crisis that hit the fishing industry hard, and the fishers’ cooperative sales-organizations that it authorized testify to this. Most of all, they helped to empower fishers in their ...
    • Buoyancy and hydrostatic balance in a West Indian Ocean coelacanth Latimeria chalumnae 

      Lauridsen, Henrik; Pedersen, Jens Mikkel Hyllested; Ringgaard, Steffen; Møller, Peter Daniel Rask (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-19)
      Background: Buoyancy and balance are important parameters for slow-moving, low-metabolic, aquatic organisms. The extant coelacanths have among the lowest metabolic rates of any living vertebrate and can aford little energy to keep station. Previous observations on living coelacanths support the hypothesis that the coelacanth is neutrally buoyant and in close-to-perfect hydrostatic balance. However, ...
    • Bycatch reduction in the deep-water shrimp (Pandalus borealis) trawl fishery by increasing codend mesh openness 

      Jacques, Nadine; Cerbule, Kristine; Pettersen, Hermann; Herrmann, Bent; Ingólfsson, Ólafur; Sistiaga, Manu Berrondo; Larsen, Roger B.; Brinkhof, Jesse; Grimaldo, Vela Eduardo; Brčić, Jure; Lilleng, Dagfinn (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-03)
      In most trawl fisheries, drag forces tend to close the meshes in large areas of diamond mesh codends, negatively affecting their selective potential. In the Barents Sea deep-water shrimp (Pandalus borealis) trawl fishery, selectivity is based on a sorting grid followed by a diamond mesh codend. However, the retention of juvenile fish as well as undersized shrimp is still a problem. In this study, ...
    • Bycatch reduction in the deep-water shrimp (Pandalus borealis) trawl fishery with a large mesh top panel 

      Cerbule, Kristine; Jacques, Nadine; Pettersen, Hermann; Ingólfsson, Ólafur Arnar; Herrmann, Bent; Grimaldo, Eduardo; Larsen, Roger B.; Brinkhof, Jesse; Sistiaga, Manu; Lilleng, Dagfinn; Brčić, Jure (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-08)
      In the Northeast Atlantic deep-water shrimp (Pandalus borealis) trawl fishery, the bycatch of juvenile fish and shrimp represents a problem. This study evaluated if inserting a 200 mm mesh size top-panel in the last three sections of the tapered upper belly section of the trawl could reduce bycatch of juveniles while maintaining the catch efficiency for deep-water shrimp. The bycatch species ...
    • Bycatch reduction in the Norwegian deep-water shrimp (Pandalus borealis) fishery with a double grid selection system 

      Larsen, Roger B.; Herrmann, Bent; Sistiaga, Manu Berrondo; Brinkhof, Jesse; Grimaldo, Eduardo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-25)
      Trawlers targeting Deep-water Shrimp (<i>Pandalus borealis</i>) in the North Atlantic use a Nordmøre sorting grid ahead of a small-meshed codend. Based on experimental fishing, the effect of adding a 9 mm spaced release grid behind the mandatory 19 mm spaced Nordmøre sorting grid, was determined. The performance in terms of size selection of the release grid and the two grids combined were assessed ...
    • CALANGO: A phylogeny-aware comparative genomics tool for discovering quantitative genotype-phenotype associations across species 

      Hongo, Jorge Augusto; de Castro, Giovanni Marques; Albuquerque Menezes, Alison Pelri; Rios Picorelli, Agnello César; Martins da Silva, Thieres Tayroni; Imada, Eddie Luidy; Marchionni, Luigi; Del-Bem, Luiz-Eduardo; Vieira Chaves, Anderson; de Freitas Almeida, Gabriel Magno; Campelo, Felipe; Lobo, Francisco Pereira (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 ...
    • Can a large-mesh sieve panel replace or supplement the Nordmøre grid for bycatch mitigation in the northeast Atlantic deep-water shrimp fishery? 

      Jacques, Nadine; Herrmann, Bent; Larsen, Roger B.; Sistiaga, Manu Berrondo; Brčić, Jure; Gökçe, Gökhan; Brinkhof, Jesse (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-26)
      The Nordmøre grid is the principle bycatch mitigation device in many shrimp trawl fisheries. However, in several of these fisheries, bycatch is a problem because small sized fish can pass through the grid and enter the codend together with the targeted shrimp. One such fishery is the Northeast Atlantic deep-water shrimp (<i>Pandalus borealis</i>) fishery, where the use of a Nordmøre grid is mandatory. ...
    • Can biodegradable materials reduce plastic pollution without decreasing catch efficiency in longline fishery? 

      Cerbule, Kristine; Grimaldo, Eduardo; Herrmann, Bent; Larsen, Roger B.; Brčić, Jure; Vollstad, Jørgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-23)
      Longlining is a widely used fishing method. During longline fishing, some of the snoods connecting the hooks to the mainline are often lost at sea. Since snoods are made of nylon or polyester, lost snoods contribute to marine plastic pollution. Replacing nylon or polyester with a new material made of biodegradable plastics can potentially reduce macro- and microplastic pollution that is caused by ...
    • Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? 

      Larsen, Roger B.; Herrmann, Bent; Brcic, Jure; Sistiaga, Manu; Cerbule, Kristine; Nielsen, Kåre Nolde; Jacques, Nadine; Lomeli, Mark Joseph Max; Tokac, Adnan; Cuende, Elsa (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-26)
      Several shrimp trawl fisheries use a Nordmöre sorting grid to avoid bycatch of fish. However, small fish can pass through the grid. Therefore, the retention of juvenile fish often remains an issue during shrimp trawling. We investigated the vertical distribution of deepwater shrimp (<i>Pandalus borealis</i>) and dominant bycatch species at the point where the Nordmöre grid section is installed. This ...
    • The capability of square-meshes and fixed-shape meshes to control codend size selection 

      Bak-Jensen, Zita; Santos, Juan; Melli, Valentina; Stepputtis, Daniel; Feekings, Jordan P.; Herrmann, Bent (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-11)
      Trawl codends are commonly made of diamond-mesh netting. However, diamond-mesh codends vary in mesh geometry along its length and during fishing due to catch build up. This introduces variability in the size selection process. This phenomenon compromises the rationality of regulating exploitation patterns in trawl fisheries through adjustments in codend mesh size. One technical solution often ...
    • Carbon, Nitrogen and Sulphur isotopic fractionation in captive juvenile hooded seal (Cystophora cristata): application for diet analysis 

      Pinzone, Marianna; Acquarone, Mario; Huyghebaert, Loreen; Sturaro, Nicolas; Michel, Loïc N.; Siebert, Ursula; Das, Krishna (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-15)
      <p><i>Rationale</i>: Intrinsic biogeochemical markers, such as stable isotope ratios of carbon, nitrogen and sulphur, are increasingly used to trace the trophic ecology of marine top predators. However, insufficient knowledge of fractionation processes in tissues continues to hamper the use of these markers.</p> <p><i>Methods</i>: We performed a controlled feeding experiment with eight juvenile ...
    • Carnobacteria in fish 

      Ringø, Einar (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-19)
      Carnobacterium is a genus of Gram-positive bacteria, within family Carnobacteriaceae, and they are catalase- and oxidase-negative, non-sporing bacteria with properties such as CO<sup>2</sup> and L (+)- lactic acid production from glucose, but they are not able to grow on acetate agar. They are ubiquitous lactic acid bacteria and have been isolated from both cold and temperate environments, and ...
    • A case of vertebral coalescence and lateral line deformity in Hypophthalamichthys nobilis (Richardson, 1844) obtained from aquaculture activity in Iran 

      Jawad, Laith A.; Kousha, Armin (Journal article; Tidsskriftartikkel, 2011-10-31)
      Vertebral coalescence and malformation in the lateral line are reported in a specimen of cultured cyprinid fish <i>Hypophthalamichthys nobilis </i>. Severe vertebral fusion was observed and described. Lateral line showed unusual undulation in the trunk region. Genetic and epigenetic causes may be implicated in these anomalies.
    • Catch and release patterns for target and bycatch species in the Northeast Atlantic deep-water shrimp fishery: Effect of using a sieve panel and a Nordmøre grid 

      Larsen, Roger B.; Herrmann, Bent; Sistiaga, Manu Berrondo; Brinkhof, Jesse; Santos, Juan (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-21)
      The Nordmøre grid and the sieve panel are two of the main devices used to reduce fish bycatch in trawl fisheries targeting shrimp species. However, even when using such devices, some small-sized fish enter the codend of the trawl together with the targeted shrimp. Therefore, bycatch reduction remains a problem in some shrimp fisheries. One such fishery is the Northeast Atlantic deep-water shrimp ...