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Surveying the younger age grows of saithe - experiences from a small scale acoustic survey at the coast of western Finnmark
(PINRO-IMR Symposium, Conference object, 1995)The small saithe (1- and 2- group) is mainly distributed in fairly shallow areas close to the Norwegian coast from Rogaland to eastern Finnmark. It is known to occur quite regularily at certain localities. It is usually ... -
Precision in recruitment estimates and its implications on management of demersal fish stocks
(PINRO-IMR Symposium, Conference object, 1995)Errors in abundance indices of recruiting year-classes will affect stock predictions. The contribution of recruiting year-classes to the predictions of catch and spawning stock biomass for the stocks of Northeast Arctic ... -
Methods of index calculation and presentation of fish abundance data using standard computer programs
(PINRO-IMR Symposium, Conference object, 1995)Standard 0-group indices distribution maps are now produced based on hand-drawn maps using AutoCad with some additional procedures. This paper briefly describes the mathod. The paper further describes ways of importing ... -
Pre-recruit studies of the North-East Arctic Greenland halibut stock
(PINRO-IMR Symposium, Conference object, 1995)Abundance indices of 0-group Greenland halibut (Reinhardtius hippoglossoides) from the international 0-group surveys in the Barents Sea showed a sudden decrease from 1987 to 1988 to a low level which has remained for the ... -
A comparison between abundance estimates of the Barents Sea capelin at the larval, 0-group and 1-group stage in the period 1981-1991
(PINRO-IMR Symposium, Conference object, 1995)A larval abundance estimate, obtained during a Norwegian survey in June, an 0-group index, obtained during the International 0-group survey in August, and an acoustic 1-group estimate, obtained during the IMR/PINRO ... -
Relative selectivity in trawls, longline and gillnets on Greenland halibut
(PINRO-IMR Symposium, Conference object, 1997)Selectivity parameters for Greenland halibut (Reinhardtius hippoglossoides, Walbaum) are compared to catches reported fiom trawl, gillnets and longline in the Norwegian scientific fisheries for Greenland halibut. A trouser ... -
Barents Sea red king crab (Paralithodes camtschatica): a review and discussion of sampling methods
(PINRO-IMR Symposium, Conference object, 1997)Stock assessments for Barents Sea red king crab are based on catch and effort data from research vessel surveys and trial fishery. Different rnethods can be used for sampling red king crab abundance, such as trawl, traps ... -
Sampling gears
(PINRO-IMR Symposium, Conference object, 1997) -
Sampling gear selectivity and its effect on estimates of mean length at age
(PINRO-IMR Symposium, Conference object, 1997)Using data fiom the Norwegian bottorn trawl surveys in the Barents Sea in February ( 1989- 1996), the International O-group surveys in the Barents Sea (1 985-1 996) and previously estimaied selectivity for the standard ... -
Multisampler - a new tool for use in sampling trawls
(PINRO-IMR Symposium, Conference object, 1997)The MultiSampler is a system to be mounted in sampling trawls to give better estimates and knowledge about fish stocks.The system is remotely controlled via a hydroacoustic link from the vcssel. It consists of a rigid ... -
Field methods for fish behaviour studies used in Norway
(PINRO-IMR Symposium, Conference object, 1997) -
Gear selection and sampling gears : proceedings of the seventh IMR-PINRO Symposium, Murmansk,23-24 June 1997
(PINRO-IMR Symposium;7, Research report, 1997) -
Selection and survival in the Norwegian shrimp trawl fisheries
(PINRO-IMR Symposium, Conference object, 1997)Shrimp trawling has aiways been associated with large bycatches. The problems are solely due to the small mesh sizes generally used in shrimp trawl compared to mesh size in trawls used for various groundfish. During the ... -
Vertical distribution of cod, haddock and redfish; impact on bottom trawl and acoustic surveys in the Barents Sea
(PINRO-IMR Symposium, Conference object, 1997)At a selected location in the Barents Sea acoustic observations, bottom- and pelagic trawl catch data were collected over a 10 day period. A large proportion of the fish were in the acoustic dead zone during the sampling ... -
Experiments with cod pots as an alternative to gill-nets in the Varanger fjord in april-june and october-december 1996
(PINRO-IMR Symposium, Conference object, 1997)A newly developed cod pot (two-chamber pot) has been tested in the VarangerfJord area as an alternative to gill-net, with the purpose to reduce the periodically large unaccounted mortality of king crab in the gill-net ... -
Schooling dynamics of spawning herring (Clupea harengus L.) in a bay in South-Western Norway
(PINRO-IMR Symposium, Conference object, 1997)The schooling dynamics of hening (Clupea harengta L.) was investigated during spawning in Raunefjord, south-westem Norway in 1994. A single school of Nonvegian spring spawning hening WSS) was tracked during daytime over ... -
Devices to avoid by-catch of birds in longline fishery
(IMR/PINRO Joint Report Series, Conference object, 2001) -
Methods to reduce bycatch of Red King Crab (Paralithodes camtschatica) in passive fishing gears
(IMR/PINRO Joint Report Series, Conference object, 2001) -
Comparisons between size distribution in surveys and commercial catches: a useful tool for monitoring changes in the size selection in the fisheries?
(IMR/PINRO Joint Report Series, Conference object, 2001)A method is proposed for using fish distributions from standarized research surveys for estimating relative selection in the fisheries. The method is applied on data for North-east arctic cod in the 1990-ies. Survey-related ...