Blar i forfatter "Grimaldo Vela, Eduardo Enrique"

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    • Accounting for Uncertainties in Biodiversity Estimations: A New Methodology and Its Application to the Mesopelagic Sound Scattering Layer of the High Arctic 

      Herrmann, Bent; Cerbule, Kristine; Brčić, Jure; Grimaldo Vela, Eduardo Enrique; Geoffroy, Maxime; Daase, Malin; Berge, Jørgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-27)
      Measures of biological diversity (biodiversity) are important for monitoring the state of ecosystems. Several indices and methods are used to describe biodiversity from field observations. Marine faunal biodiversity is often quantified based on analysis of samples collected using a trawl during research surveys. To monitor spatial and temporal changes in biodiversity between surveys, samples are ...

    • The effect of grid size on catch efficiency and by-catch in the demersal trawl fishery for Norway pout (Trisopterus esmarkii) 

      Brinkhof, Jesse; Grimaldo Vela, Eduardo Enrique; Herrmann, Bent; Pettersen, Hermann (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-05)
      Norway pout (Trisopterus esmarkii) is caught with large trawls with small meshed codends, inevitably causing the fishery to have large by-catch issues. To reduce the amount of by-catch, a rigid sorting grid was made compulsory in 2010. However, there is still a severe by-catch issue, as well as the loss of target species because of the grid. A possible cause might be clogging of the grid, which could ...

    • Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery 

      Larsen, Roger B.; Herrmann, Bent; Sistiaga, Manu; Brinkhof, Jesse; Cerbule, Kristine; Grimaldo Vela, Eduardo Enrique; Lomeli, Mark JM (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-27)
      The introduction of the Nordmøre grid in shrimp trawls has reduced the bycatch of non-target species. In the Norwegian Northern shrimp (Pandalus borealis) fishery, the mandatory selective gear consists of a Nordmøre grid with 19 mm bar spacing combined with a 35 mm mesh size diamond mesh codend. However, fish bycatch in shrimp trawls remains a challenge and further modifications of the gear that ...

    • Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery 

      Brinkhof, Jesse; Sistiaga, Manu; Herrmann, Bent; Grimaldo Vela, Eduardo Enrique; Larsen, Roger B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-14)
      Two decades of use of the compulsory selectivity gear configuration in the Northeast Atlantic bottom trawl fishery, which consists of a rigid sorting grid followed by a diamond mesh codend, have revealed problems with performance and efficiency. Size selectivity gear alternatives to this configuration are being pursued, and recent studies of codends with shortened lastridges have reported promising ...

    • Understanding and predicting the effect of entrance cone diameters on the catch efficiency of snow crabs (Chionoecetes opilio) in conical pots 

      Cerbule, Kristine; Herrmann, Bent; Grimaldo Vela, Eduardo Enrique; Sistiaga, Manu; Brinkhof, Jesse; Vollstad, Jørgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-11)
      Conical pots with a plastic entrance cone on the top are a type of fishing gear used to harvest snow crabs (Chionoecetes opilio) in Arctic regions. In this study, we assessed the effect of pot entrance diameter on the catch efficiency of snow crabs. We used catch data collected during sea trials of pots with different entrance cone diameters, and we conducted laboratory experiments where morphological ...