This study investigated the efficiency of a sieve‐panel concept, intended to separate bycatch species from <i>Nephrops</i> (Norway lobster) in a trawl gear via mechanical and behavioural means. Four different designs of varying panel mesh size or inclination were tested in experimental fishing. For each design, the length‐dependent sieving efficiency, defined as the fraction of <i>Nephrops</i> or ...

Trawl-caught Atlantic cod (<i>Gadus morhua</i>) often yield high variable fillet quality potentially related to capture stress. To investigate mechanisms involved in causing variable quality, commercial-sized (size 3.5±0.9 kg) Atlantic cod were swum to exhaustion in a large swim tunnel and exposed to extreme crowding (736±50 kg m3) for 0, 1 or 3 hours in an experimental cod-end. Further, fish were ...

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 ...

I dette forsøket ble torsk fanget levende og lagret i merd hvor den ble fôret med hhv. lodde og kommersielt torskefôr i 3 måneder. Etter skånsom slakting og utblødning i 30 minutter, ble fisken sløyd og de biologiske data registrert før maskinell filetering enten pre-rigor (innen 2 timer etter død) og post-rigor (etter 4 dagers is-lagring av sløyd fisk). Det ble produsert ryggfileter (Loins) enten ...

Rapport fra en arbeidsgruppe nedsatt for å fremme forslag til ny strategi for fiskeriforskningsmiljøet i Tromsø for nye FoU-tilbud til sjømatindustrien. Gruppen fikk i oppgave å gi innspill til styrene i Norges Fiskerihøgskole og Fiskeri¬forsk¬ning om hvordan de to institusjonene i samarbeid kan styrke satsingen overfor norsk fiske- og sjømatindustri. Gruppens anbefalinger er at styrene i ...

Large-scale patterns in species diversity and community composition are associated with environmental gradients, but the implications of these patterns for food-web structure are still unclear. Here, we investigated how spatial patterns in food-web structure are associated with environmental gradients in the Barents Sea, a highly productive shelf sea of the Arctic Ocean. We compared food webs ...

Målet med denne rapporten er å synliggjøre kunnskapsbehov som er viktige for å sikre trygg mat og beskyttelse av miljøet i årene som kommer, og forbedre den nasjonale kunnskapsbasen. Rapporten er den siste i en serie av rapporter om kunnskapsbehov publisert av Vitenskapskomiteen for mat og miljø (VKM, tidligere Vitenskapskomiteen for mattrygghet). Den løfter frem kunnskapsbehov som er identifisert ...

A workshop was held at Institute of Marine Research, Flødevigen Marine Research Station, Arendal, Norway, 17-19 February 1999, to investigate methodes for age-determination of lumpsucker (Cyclopterus lumpus) from otoliths. The report summarises the results from the workshop and some subsequent analyses. The otoliths are very small and special training is necessary to locate them. The zonation pattern ...

This paper presents field experiment results of using a new technology to harvest copepods (Calanus sp.) in the ocean by bubble upwelling. Two largo-scale bubble rafts, a 21 m2 and a flexible 75 m2 bubble raft with tow parallel and perpendicular sparger elements, respectively, were field tested in areas with high, upper 25-m water column Calanus densities. Measured bubble-driven upwelling velocities ...

<p>Fisheries Stakeholders are understandably most concerned with immediate problems. Often these problems are related to proposed rule changes. This short term focus is in itself a serious problem for introducing Ecosystems Based Fisheries Management (EBFM), which is typically seen as a long-term approach. However, the short-term response of fishers to rule changes may well have long-term consequences ...