Browsing Brage IMR by Author "Ingólfsson, Ólafur Arnar"

Now showing items 1-20 of 21

    • A catch limitation device to avoid excessive catches in the blue whiting (Micromesistius poutassou) Northeast Atlantic pelagic trawl fishery 

      Ingólfsson, Ólafur Arnar; Breen, Michael; Rosen, Shale; Sistiaga, Manu; Jørgensen, Terje; Lilleng, Dagfinn; Saltskår, Jostein; Kvalvik, Liz Beate Kolstad; Hannaas, Sigurd; Pettersen, Hermann (Peer reviewed; Journal article, 2022)
      Blue whiting (Micromesistius poutassou) is harvested in the Northeast Atlantic by a multinational fleet of pelagic trawlers. Occasionally, vessels take catches which exceed their remaining holding capacity and in extreme ...

    • Artificial light improves size selection for northern shrimp (Pandalus borealis) in trawls 

      Ingólfsson, Ólafur Arnar; Jørgensen, Terje; Sistiaga, Manu Berrondo; Kvalvik, Liz Beate Kolstad (Peer reviewed; Journal article, 2021)
      Size selection in the northern shrimp (Pandalus borealis) trawl fisheries is a widely studied topic. While the focus has largely been on codend and grid selectivity, studies have shown the importance of other design changes ...

    • Bycatch reduction in the deep-water shrimp (Pandalus borealis) trawl fishery by increasing codend mesh openness 

      Jacques, Nadine; Pettersen, Hermann; Cerbule, Kristine; Herrmann, Bent; Ingólfsson, Ólafur Arnar; Sistiaga, Manu Berrondo; Larsen, Roger B.; Brinkhof, Jesse; Grimaldo, Vela Eduardo; Brčić, Jure; Lilleng, Dagfinn (Peer reviewed; Journal article, 2021)
      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, ...

    • 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 (Peer reviewed; Journal article, 2021)
      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 ...

    • Catch Control in the Blue Whiting Pelagic Trawl Fishery - Research Cruise Report [2022825]: FV “Vikingbank” 

      Breen, Michael; Saltskår, Jostein; Hannaas, Sigurd; Kvalvik, Liz Beate Kolstad; Ingólfsson, Ólafur Arnar; Lilleng, Dagfinn; Pettersen, Hermann; Foss, Bjørn; Hals, Alexander William Ingvarsson (Toktrapport;2023 - 1, Research report, 2023)
      This cruise has demonstrated that the catch limitation system can successfully limit catches in the blue whiting pelagic trawl fishery, with negligible loss during the fishing operation while effectively releasing excessive ...

    • Catches in abandoned snow crab (Chionoecetes opilio) pots in the Barents Sea 

      Humborstad, Odd Børre; Eliassen, Lasse Krøger; Siikavuopio, Sten Ivar; Løkkeborg, Svein; Ingólfsson, Ólafur Arnar; Hjelset, Ann Merete (Peer reviewed; Journal article, 2021)
      During a 2018 retrieval cruise for abandoned snow crab (Chionoecetes opilio) pots in the Barents Sea, approximately 8600 pots abandoned 1.5 years earlier were recovered. Forty-three percent of a subsample of 1000 pots ...

    • Development and evaluation of dynamic catch control devices in the demersal seine fisheries for cod (Gadus morhua) 

      Ingólfsson, Ólafur Arnar; Humborstad, Odd Børre; Ferter, Keno; Rosen, Shale (Peer reviewed; Journal article, 2021)

    • Fangstkontroll i fisket etter kolmule med pelagisk trål 

      Breen, Michael; Saltskår, Jostein; Hannaas, Sigurd; Kvalvik, Liz Beate Kolstad; Ingólfsson, Ólafur Arnar; Lilleng, Dagfinn (Toktrapport fra Havforskningsinstituttet;Nr. 10 - 2021, Research report, 2021)
      Fiskeri- og havbruksnæringens forskningsfinansiering (FHF) mottok i 2017 en forespørsel fra dem som deltar i fisket etter kolmule, om å studere utfordringer med hensyn til fangstkontroll og helse, miljø og sikkerhet i ...

    • Fangstkontroll i kolmulefisket — M/S Morten Einar, mars 2023 

      Ingólfsson, Ólafur Arnar; Kvalvik, Liz Beate Kolstad; Pettersen, Hermann (Toktrapport;2023 - 15, Research report, 2023)
      Prosjektet fokuserer på å utarbeide tekniske innretninger for å redusere faren for sprenging av trålposer i fisket etter kolmule. Fisket etter kolmule med norske fartøy foregår i all hovedsak med pelagisk trål og i størst ...

    • Fangstkontroll i kolmuletrål - Forstudie — Fiskeforsøk på Porcupinebanken i 2018 

      Rosen, Shale; Ingólfsson, Ólafur Arnar; Jørgensen, Terje; Kvalvik, Liz Beate Kolstad; Saltskår, Jostein (Rapport fra havforskningen;, Research report, 2019)
      Under FHF Prosjekt 901495: Fangstkontroll i kolmuletrål – Forstudie ble det samlet inn systematiske data om de mulige årsakene til og løsninger på sporadisk sprenging av sekker i det kommersielle trålfiskeriet etter kolmule ...

    • Forsøk med sekkeforlengelser av kvadratiske masker i snurrevad — Tokt med snurrevadfartøyet Båragutt, mai 2022 

      Ingólfsson, Ólafur Arnar; Humborstad, Odd Børre; Kvalvik, Liz Beate Kolstad; Pettersen, Hermann (Toktrapport;2022 - 11, Research report, 2022)
      I fiske etter hyse med snurrevad brukes det som regel «sekkeforlengelser» av diamantmasker foran den obligatoriske kvadratmaskesekken. I disse forsøkene ble det foretatt parvise sammenligninger av diamantmaskeforlengelse ...

    • Increasing catch efficiency for Nephrops in deep-water shrimp (Pandalus borealis) trawl fisheries 

      Ingólfsson, Ólafur Arnar; Jørgensen, Terje; Sistiaga, Manu; Herrmann, Bent; Kvalvik, Liz Beate Kolstad (Peer reviewed; Journal article, 2022)
      In Skagerrak and the North Sea, coastal vessels harvest deep-water shrimp (Pandalus borealis) in a mixed fishery, in which catches of Nephrops (Nephrops norvegicus) are of economic importance for the fleet. Fishermen ...

    • Inferring fish behaviour at the trawl mouth from escape location 

      Nguyen, Vang Y.; Bayse, Shannon M.; Einarsson, Haraldur Arnar; Ingólfsson, Ólafur Arnar (Peer reviewed; Journal article, 2023)
      In this study, we used escape location underneath the trawl to understand groundfish herding behaviour at the trawl mouth. Three collecting bags (port, center, starboard) were mounted under the trawl and behind the footgear ...

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

      Tobiassen, Torbjørn; Martinsen, Gustav; Kristoffersen, Silje; Hustad, Anette; Olsen, Stein Harris; Heia, Karsten; Joensen, Sjúrður; Ingólfsson, Ólafur Arnar; Nordtvedt, Tom Ståle (Nofima rapportserie, Research report, 2019)

    • Metodeutvikling for seleksjon i snurrevad - Toktrapport fra MS Fangst, oktober 2022 

      Ingólfsson, Ólafur Arnar; Kvalvik, Liz Beate Kolstad; Schuster, Erik (Toktrapport;2023 - 16, Research report, 2023)
      Prosjektet «Seleksjon i snurrevad» (FHF-901725) har som hovedmålsetting å estimere størrelsesseleksjon for hyse i snurrevadfiske og utforme snurrevadsekk / seleksjonsinnretning som sorterer ut hyse under minstemålet slik ...

    • Selective flatfish seine: A knee-high demersal seine barely catches cod 

      Ingólfsson, Ólafur Arnar; Humborstad, Odd Børre; Løkkeborg, Svein (Peer reviewed; Journal article, 2019)
      Norwegian coastal cod (Gadus morhua) protection restricts the use of active fishing gears. Demersal seines, acknowledged as being efficient for targeting flatfish, are therefore largely excluded from the fjords. To exploit ...

    • Seleksjon i reketrål: overlevelse til reker som selekteres ut i overflaten - Sluttrapport for FHF-prosjekt 901661 

      Jørgensen, Terje; Ingólfsson, Ólafur Arnar; Larssen, Wenche Merete Emblem; Anders, Neil; Christophersen, Gyda; Kvalvik, Liz Beate Kolstad; Landes, Anja Monika; Stiansen, Stian; Breen, Michael; Saltskår, Jostein; Dahl, Thomas Hagby; Hannaas, Sigurd; Jelmert, Anders (Rapport fra havforskningen;2023 - 46, Research report, 2023)
      Fra 2020 til 2022 ble det gjennomført en rekke forsøk i Skagerrak i forbindelse med seleksjon og overlevelse til dypvannsreker (Pandalus borealis). Hovedmålsettingen var å kvantifisere hvor stor andel av trålsekkseleksjonen ...

    • Sequential codend improves quality of trawlcaught cod 

      Brinkhof, Jesse; Olsen, Stein Harris; Ingólfsson, Ólafur Arnar; Herrmann, Bent; Larsen, Roger B. (Peer reviewed; Journal article, 2018)
      Trawl-caught fish are frequently associated with deteriorated catch quality. This study presents a new dual sequential codend concept with the aim of improving the quality of trawl-caught fish by minimizing the frequency ...

    • Shorter trawls improve size selection of northern shrimp 

      Ingólfsson, Ólafur Arnar; Jørgensen, Terje (Journal article; Peer reviewed, 2019)
      Discards of small northern shrimp (Pandalus borealis) are a problem in the Skagerrak northern shrimp trawl fishery. To reduce catches of small shrimp, we studied the effect of trawl belly length on size selectivity in ...

    • Surface selection of haddock and cod in the Norwegian demersal seine fisheries 

      Ingólfsson, Ólafur Arnar; Humborstad, Odd Børre; Løkkeborg, Svein (Peer reviewed; Journal article, 2021)
      Size selection in active fishing gears is a continuous process and undersized fish may escape during the whole fishing operation. Fish that escape during the surface hauling operation are likely to experience higher mortality ...