Browsing Brage IMR by Subject "VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924"
Now showing items 181-200 of 725
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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 ... -
Fullscale experiments with a new midwater 3-foil type and standard Waco and süberkrüb otterboards.
(ICES CM Documents;1979/B:25, Working paper, 1979)The experiments included comparative spread and depth measurements with equal rigging of a large blue-whiting trawl for 1500 HP vessel engine (6 to 8 m2 boards) and a 600 HP 4-pane1 combination trawl (4 to 4.5 m2 boards). ... -
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 ... -
Gear selection and sampling gears : proceedings of the seventh IMR-PINRO Symposium, Murmansk,23-24 June 1997
(PINRO-IMR Symposium;7, Research report, 1997) -
A general system for logging information from instruments in the sea.
(ICES CM Documents;1978/B:23, Working paper, 1978)The paper describes a logging system which aims at integrating various forrns for primary data recording into a common standard that can be handled by the same reading and data processing equipment, Some illustrative ... -
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 ... -
Haddock avoidance reactions during trawling
(ICES CM Documents;1986/B:36, Working paper, 1986)Fish reaction to the whole trawling operation was studied using a stationary echo sounder-system observing the fish in front of the vessel and during trawl passage. Strong avoidance reactions were observed on haddock, ... -
Halvparten av nordsjøsilda kan dø etter trenging i not : Crowding in purse seine can kill half the catch of North Sea herring
(Havforskningsnytt;Nr. 6 - 2010, Working paper, 2010)Catch regulation in purse seining for herring has traditionally been done by discarding all or part of the catch if it is too big, or if the size or quality of the herring does not match requirements. Net burst is also ... -
Har testet beste praksis for slipping fra not
(Havforskningsnytt;Nr. 2-2016, Working paper, 2016) -
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 ... -
Hermod, a single species model for the Norwegian spring spawning herring stock
(ICES CM Documents;1994/H:11, Working paper, 1994)HERMOD is a model for the population dynamics and migration of the Norwegian Spring spawning herring that is being developed with the double purpose of being an independent single species model and of being integrated ... -
Herring Tagging Experiment at Bløden Ground 1957 Part III : An analysis of the results to December 1957
(ICES CM Documents;, Working paper, 1957) -
Herring Tagging Experiment at Bløden Ground Part II (A preliminary report)
(ICES CM Documents;, Working paper, 1957) -
Holistic evaluation of management policies: What are the consequences of modified gear use on Georges Bank?
(ICES CM documents;2009/ O:26, Working paper, 2009)Georges Bank haddock is a recently recovered fish stock in the New England groundfish fishery. Due to federal constraints under the Magnuson-Steven Act, however, this stock cannot be optimally exploited due to the bycatch ... -
How and why acoustic detectability and catchability of herring change with individual motivation and physiological state in a variable environment: a multi-scale study on a local herring population in southwestern Norway
(ICES CM documents, Working paper, 2006)The understanding of distribution and aggregation in herring (Clupea harengus) can be enhanced by integrated multi-scale studies in small ecosystems. Hydro-acoustics, underwater cameras, herring and predator gillnet samples ... -
How many trawl hauls, and how many fish from each haul are needed to obtain a given precision in the age structure estimate for Norwegian spring spawning herring? A bootstrap approach
(ICES CM documents, Working paper, 2006)The Norwegian spring spawning herring is assessed each year from acoustic surveys. The age structure in the stock is estimated from trawl samples. Typically, about 10 trawl samples are taken per survey, and 100 fish from ... -
How to correct fish density estimates for extinction
(ICES CM Documents;1990/B:24, Working paper, 1990)There have been many experimental studies on acoustic shadowing, but once the effect is quantified, how is the compensation to be effected? This work shows how, through postprocessing of stored time series, containing ...