Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone
Precision and relevance of pre-recruit studies for fishery management related to fish stocks in the Barents Sea and adjacent waters. Proceeding of the sixth IMR-PINRO Symposium Bergen, 14-17 June 1994 In resource surveys, representative identification of species and sizes of fish is of vital importa...
Main Authors: | , |
---|---|
Format: | Conference Object |
Language: | English |
Published: |
1995
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/107549 |
id |
ftimr:oai:imr.brage.unit.no:11250/107549 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/107549 2023-05-15T15:39:00+02:00 Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone Valdemarsen, John Willy Misund, Ole Arve 1995 432157 bytes application/pdf http://hdl.handle.net/11250/107549 eng eng PINRO-IMR Symposium 6 http://hdl.handle.net/11250/107549 s. 135-144 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 Conference object 1995 ftimr 2021-09-23T20:15:35Z Precision and relevance of pre-recruit studies for fishery management related to fish stocks in the Barents Sea and adjacent waters. Proceeding of the sixth IMR-PINRO Symposium Bergen, 14-17 June 1994 In resource surveys, representative identification of species and sizes of fish is of vital importance. Various designs and sizes of pelagic trawls and techniques are used in the pelagic zone by Norwegian research vessels for this purpose. This paper describes trawl designs used for O-group surveys and a larger trawl used for adult fish. The largest trawl, which has a vertical opening of 30 m when towed at 3.5 - 4 knots, can be rigged for close-to-surface trawling as well as for rnid- and deep-water trawling with minor adjustment of the rigging. The performance of the various trawls is described, based on geometric measurements using Scanmar instruments and observations with a TV-camera in a towed underwater vehicle. The trawl mouth area of the O-group trawl is approximately 10 x 10 m, and it can be rigged to catch efficiently in all depths from surface downwards. The large pelagic trawl is rigged with large surface buoys and lenghtened upper bridles when used in the surface layer to sample herring and mackerel. Conference Object Barents Sea Institute for Marine Research: Brage IMR Barents Sea Bergen |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 |
spellingShingle |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 Valdemarsen, John Willy Misund, Ole Arve Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone |
topic_facet |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 |
description |
Precision and relevance of pre-recruit studies for fishery management related to fish stocks in the Barents Sea and adjacent waters. Proceeding of the sixth IMR-PINRO Symposium Bergen, 14-17 June 1994 In resource surveys, representative identification of species and sizes of fish is of vital importance. Various designs and sizes of pelagic trawls and techniques are used in the pelagic zone by Norwegian research vessels for this purpose. This paper describes trawl designs used for O-group surveys and a larger trawl used for adult fish. The largest trawl, which has a vertical opening of 30 m when towed at 3.5 - 4 knots, can be rigged for close-to-surface trawling as well as for rnid- and deep-water trawling with minor adjustment of the rigging. The performance of the various trawls is described, based on geometric measurements using Scanmar instruments and observations with a TV-camera in a towed underwater vehicle. The trawl mouth area of the O-group trawl is approximately 10 x 10 m, and it can be rigged to catch efficiently in all depths from surface downwards. The large pelagic trawl is rigged with large surface buoys and lenghtened upper bridles when used in the surface layer to sample herring and mackerel. |
format |
Conference Object |
author |
Valdemarsen, John Willy Misund, Ole Arve |
author_facet |
Valdemarsen, John Willy Misund, Ole Arve |
author_sort |
Valdemarsen, John Willy |
title |
Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone |
title_short |
Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone |
title_full |
Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone |
title_fullStr |
Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone |
title_full_unstemmed |
Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone |
title_sort |
trawl designs and techniques used by norwegian research vessels to sample fish in the pelagic zone |
publishDate |
1995 |
url |
http://hdl.handle.net/11250/107549 |
geographic |
Barents Sea Bergen |
geographic_facet |
Barents Sea Bergen |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
s. 135-144 |
op_relation |
PINRO-IMR Symposium 6 http://hdl.handle.net/11250/107549 |
_version_ |
1766370463925141504 |