• A method to automatically detect fish aggregations using horizontally scanning sonar 

      Vatnehol, Sindre; Pena, Hector; Handegard, Nils Olav (Journal article; Peer reviewed, 2018)
      Pelagic fishes are a major source of protein and unsaturated fatty acids, and robust management is critical to avoid overfishing. Fisheries management is often supported by indices from scientific acoustic-trawl surveys, ...
    • Accuracy of the Kirchhoff-approximation and Kirchhoff-ray-mode fish swimbladder acoustic scattering models 

      Macaulay, Gavin; Pena, Hector; Fässler, Sacha M.M.; Pedersen, Geir; Ona, Egil (Journal article; Peer reviewed, 2013)
      The acoustic backscatter from pressure release prolate spheroids and a three-dimensional representation of a fish swimbladder (Chilean jack mackerel, Trachurus symmetricus murphyi) was calculated using four target strength ...
    • Feasibility study on the use of scientific multibeam sonar to characterize the Atlantic Bluefin Tuna spawning stock 

      Tenningen, Maria; Pena, Hector; Korneliussen, Rolf; Ona, Egil; Pons, Vicent Puig (Rapport fra havforskningen;2019 - 34, Research report, 2019)
      The Institute of Marine Research (IMR) and the Polytechnic University of Valencia (UPV) were invited by ICCAT Atlantic-Wide Research Program for Bluefin Tuna (GBYP) to carry out a feasibility study on the use of scientific ...
    • Purse Seine Catch Control - Faglig sluttrapport 

      Pena, Hector; Saltskår, Jostein; Totland, Bjørn; Vold, Aud; Breen, Michael; Ingolfsson, Olafur; Tenningen, Maria; Øvredal, Jan Tore (Rapport fra havforskningen;Nr. 3 - 2018, Research report, 2018)
    • Survey report: Developing methods for abundance estimation of bluefin tuna in Norwegian waters 

      Pena, Hector; Tenningen, Maria; Zhang, Guosong; Skaret, Georg (Toktrapport;2022 - 5, Research report, 2022)
      The major aim of this survey was to map and quantify distribution, school size and behaviour of Atlantic bluefin tuna (Thunnus thynnus) migrating to and feeding in Norwegian waters.The survey covered the region between ...
    • Testing of acoustic stock estimation of spawning capelin 

      Pena, Hector; Totland, Atle; Øvredal, Jan Tore (Toktrapport, Research report, 2019)
    • Testing of trawl-acoustic stock estimation of spawning capelin 2020 

      Skaret, Georg; Pena, Hector; Totland, Atle; Anthonypillai, Valentine; Karlson, Stine; Drivenes, Lage; Røttingen, Jostein; Bogetveit, Frøydis Rist (Toktrapport;2020 - 2, Research report, 2020)
      This report describes the second in a series of three trawl-acoustic monitoring surveys of the spawning stock of capelin during the migration to the coast. The survey is a response to a proposal from the industry to evaluate ...
    • Testing of trawl-acoustic stock estimation of spawning capelin 2021 

      Skaret, Georg; Pena, Hector; Totland, Atle; Zhang, Guosong; Hellenbrecht, Lea Marie; Karlson, Stine; Pedersen, Ronald; Tonheim, Susanne; Rist, Frøydis; Anthonypillai, Valentine (Toktrapport;2021 - 5, Research report, 2021)
      This report describes the third in a series of trawl-acoustic monitoring surveys of the spawning stock of capelin during the migration to the coast. The survey is a response to a proposal from the industry to evaluate the ...
    • Testing of trawl-acoustic stock estimation of spawning capelin 2022 

      Skaret, Georg; Pena, Hector; Totland, Atle; Tenningen, Maria; Zhang, Guosong (Toktrapport;2022 - 4, Research report, 2022)
      This report describes the fourth in a series of trawl-acoustic monitoring surveys of the spawning stock of capelin during the migration to the coast. The survey is a response to a proposal from the industry to evaluate the ...