Browsing Havforskningsinstituttet by Subject "redskapsforsøk"
Now showing items 41-60 of 154
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Experiences using the constraint technique on bottom trawl doors
(ICES CM Documents;1993/B:18, Working paper, 1993)The constraint technique, i.e. using a rope between the warps, has the intention of minimizing the variability in trawl geometry with depth. Experiments with the constraint technique on two different bottom trawls used ... -
Experiences using the ES-400, split-beam echo sounder, with special reference to the single-fish recognition criterion
(ICES CM Documents;1986/B:38, Working paper, 1986)Realistic estimates of in situ target strength can be made when the fish concentrations are acoustically resolved into single individuals. In the split-beam echo sounder, as in all other systems available for in situ ... -
Experimental fishing with multifilament, monofilament, and monotwine gillnets in the spawning season of Arcto-Norwegian cod in Lofoten in 1974
(ICES CM Documents;1974/B:17, Working paper, 1974) -
Experiments with a Topside Chafer of Double Mesh-size
(ICES CM Documents;1966/F:1, Working paper, 1966) -
Experiments with net of hexagonal meshes in purse seine
(ICES CM Documents;1977/B:39, Working paper, 1977) -
Field experiences with a new miniature vector averaging current meter
(ICES CM Documents;1991/C:20, Working paper, 1991)For several years Inst. of Marine Research Bergen has been developing miniaturized modular current meters. Thanks to major improvements in electronic component technology in recent years, a physically small current meter ... -
Fiske- og atferdsforsøk av torsk i Troms i september 2013
(Rapport fra Havforskningen;Nr. 15-2014, Working paper, 2014) -
Fiskeforsøk etter torsk i Vesterålen i mars/april 2013
(Rapport fra Havforskningen;Nr. 14-2014, Working paper, 2014) -
Flume tank testing of a multiple inner-paneled trawl to reduce loss and clogging of small organisms
(Rapport fra Havforskningen;5-2016, Working paper, 2016-02) -
Forsøk med torskegarn med notpanel for å unngå bifangst av kongekrabbe
(Rapport fra Havforskningen;6 - 2012, Working paper, 2012-01) -
Forsøk med Trygg-rist med 10 mm spileavstand, og pose av kvadratmasker om bord i MS ”Caprice” 13.–16. april 2015
(Rapport fra Havforskningen;14-2015, Working paper, 2015-06-04) -
Full scale fishing trials for tusk (Brosme brosme) and cod (Gadus morhua) with a collapsible fish trap
(ICES CM Documents;1988/B:33, Working paper, 1988)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 ... -
Full scale tests of improved longline gear
(ICES CM Documents;1985/B:45, Working paper, 1985)A new type of bottom set longline was tested in trials during the cod fishery off Finnmark November-December 1984. This gear differed from traditional longloine, by being rigged with swivel-mounted monofilament gangions ... -
Further experiments with radial escape section (RES) as fish-shrimp separator in trawl
(ICES CM Documents;1986/B:29, Working paper, 1986)A new approach to the bycatch problem when trawling for shrimp was initiated in Norway in 1984 utilizing the difference in swimming behaviour of fish and shrimp. A radial escape section (RES) in the aft belly of the ... -
Further results of Norwegian longline studies
(ICES CM Documents;1977/B:43, Working paper, 1977) -
Færre kongekrabber i torskegarn med notpanel :: Cod gillnets with a net panel reduce the king crab bycatch
(Havforskningsnytt;Nr. 4 - 2012, Working paper, 2012)I utbredelsesområdet til kongekrabben er den blitt et økende problem i garnfiske etter torsk. Forsøk viser at et notskjørt nederst på garna gir betydelig mindre kongekrabbe i fangsten, men samtidig reduseres torskefangstene ... -
Grid devices to select shrimp size in trawls
(ICES CM Documents;1993/B:35, Working paper, 1993)Discard of small shrimps and fish is a substantial problem in the fishery for deepwater shrimp in the Northwest Atlantic. In order to solve this problem, different grid devices are under development to sort out discard ... -
Height and spread of the Danish seine
(ICES CM Documents;1988/B:29, Working paper, 1988)Height and spread of trawls is successfully measured by the wireless "Scanmar" system. Several experiments made by fishermen have shown that this system will not work on the Danish seine. A modified version of the ... -
Hull mounted, protruding transducer for improving echo integration in bad weather
(ICES CM Documents;1990/B:31, Working paper, 1990)A 38 kHz split beam survey transducer has been mounted on the tip of a 4 m vertical protrusile stabilizing keel of the United States NOAA fishery research vessel R/V Miller Freeman. Air blocking problems, generally ... -
Hvordan få til ansvarlig slipping fra not
(Havforskningsnytt;Nr. 7 - 2012, Working paper, 2012)Dersom makrell og sild trenges for hardt under notfiske, dør mye av fisken etter en stund selv om den slippes. Skal fisken overleve, må den slippes i en tidlig fase og på en ansvarlig måte. Her kommer forslag om hva som ...