Full scale fishing trials for tusk (Brosme brosme) and cod (Gadus morhua) with a collapsible fish trap

A collapsible fish trap with low weight and low stacking volume has been developed and tested in full scale fishing operations. The catch rates of tusk were promising, while the catches of cod were too low and variable to commercial fishing operation

Reduced bycatch of red king crab (Paralithodes camtschatica) in the cod gillnet fisheries in northern Norway: Fishing trials with norsel mounted gillnets

Bycatch of red king crab (Paralithodes camtschatica) in stationary fishing gears, q&ally gillnets, is an increasing problem to the inshore fishermen in the northern part of Norway (Finnmark county). The results are large bycatches of king crabs together with the crabs’ damages on the gear and catch. In the cod gillnet fisheries, the problem might be solved by using specially made gillnets (“norsel-mounted” nets) where the net itself is floated 0.5 meters above the seabed. The norsel-mounted nets were compared with standard nets in the Varangerfjord (eastern Finnmark) in the period 17 March - 28 May 1999. The trials showed that norsel nets needed more floats than the standard nets to get the net to stand properly in the sea (to get the norsels stretched out suitably). By using extra float (rings) on the norsel mounted nets the bycatches of king crab were reduced to an acceptable level with an average of 0.6 crabs/net, compared with 3.3 crabs/net on standard and 6.7 crabs/net on nor-se1 nets without extra float. Norse1 nets caught only about l/3 as many fish as standard nets. The catch results indicated that the gear configuration functioned in order to reduce the bycatch of red king crab. Loss of fish up to 65% is, however not satisfying. Further work is needed to find a solution that gives a minimal loss of fish. Knowledge about the different species’ behaviour is of importance in the further development of a more selective gear

Fishing for cod (Gadus morhua), ling (Molva molva) and tusk (Brosme brosme) using two-chamber pots along the Norwegian coast

Several experiments using two-chamber pots have been performed; comparing two-chamber pots with other commercial pots, and comparing two-chamber pots to a bottom long line. Earlier experiments with different types of bait, and a variation of soak times are also discussed here. It is proved that two-chamber pots catch significantly more fish than other commercial pots. Especially catches of cod are increased, but an increase in catches is also shown for species such as ling and tusk. It is shown that two-chamber pots can also serve as an alternative to long line. The report discusses different operational conditions, such as setting pots linked together, setting pots individually, bait bags, handling, and deck arrangements. Experiments with bait shows that squid (Ilex sp) give best catches of cod, whereas tusk and ling prefer mackerel (Scomber scombrus) as bait. Soak times of more than 24 hours will not necessarily give better catches. NORSK SAMMENDRAG: Det har vært utført flere forsøk med en nyere tokammerteine. Denne er blitt sammenlignet med andre kommersielle fisketeiner, i tillegg til bunnline. Også tidligere forsøk hvor agntyper og forskjellige ståtider ble undersøkt er her diskutert. Det er funnet at tokammerteine fisket betydelig bedre enn vanlige kommersielle teiner, spesielt når det gjaldt torsk (Gadus Morhua) og lange (Molva molva), men også når det gjaldt brosme (Brosme brosme). Tokammerteine viste seg også i perioder å kunne være et alternativ til line. Rapporten inneholder beskrivelse av forskjellige operasjonelle forhold ved bruk av teiner slik som setting på lenke, setting enkeltvis, agnposer, håndtering og dekksarrangement. Agnforsøkene viste at akkar (Ilex sp) agn er best for fangst av torsk, mens brosme og lange har størst preferanse for makrell (Scomber scombrus). Ståtid ut over ett døgn øker ikke fangstene

The effect of shading in pen rearing of Atlantic salmon (Salmo salar)

A full scale pen rearing experiment with covers to reduce illumination was carried out. No significant effects were observed on growth, mortality, ectoparasite infection, maturation or net pen fouling

Komparative fiskeforsøk med garn og teiner : tokt med MS "Ransbøen" 09.05.- 23.05.03

Over tittelen: Toktrapport. Prosjekt nr. 060207, tokt nr. 2003808.Under vinter/vårtorskefisket i Varangerfjorden får en periodevis til dels mye kongekrabbe i gamene. Dette representerer mye ekstra arbeid for fiskerne samt at det gir en betydelig stor bidødielighet av kongekrabbe i dette fiskeriet. Mye av kongekrabben som taes ut av garnene er ødelagt eller skadet slik at dødeligheten av krabbe relatert til total fangst av krabbe er høy. For å prøve å redusere dette problemet er det startet opp et prosjekt "FHF Kongekrabbeseleksjon" som er finansiert av Fiskeri - og Havbruksnæringens Forskningsfond, Ordningen med fiskeforsøk og veiledningstjeneste og Havforskningsinstituttet. Denne rapporten omhandler et komparativt forsøk med garn og teiner for å se om teiner kan være et alternativ til garnfiske etter torsk