Shorter trawls improve size selection of northern shrimp
Discards of small northern shrimp (Pandalus borealis) are a problem in the Skagerrak northern shrimp trawl fishery. To reduce catches of small shrimp, we studied the effect of trawl belly length on size selectivity in November 2017 and June 2018 onboard 15 and 27 m double-rigged shrimp trawlers. The...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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crcansciencepubl:10.1139/cjfas-2018-0443 2023-12-17T10:47:30+01:00 Shorter trawls improve size selection of northern shrimp Ingólfsson, Ólafur Arnar Jørgensen, Terje 2020 http://dx.doi.org/10.1139/cjfas-2018-0443 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2018-0443 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2018-0443 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 77, issue 1, page 202-211 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2020 crcansciencepubl https://doi.org/10.1139/cjfas-2018-0443 2023-11-19T13:38:24Z Discards of small northern shrimp (Pandalus borealis) are a problem in the Skagerrak northern shrimp trawl fishery. To reduce catches of small shrimp, we studied the effect of trawl belly length on size selectivity in November 2017 and June 2018 onboard 15 and 27 m double-rigged shrimp trawlers. The selectivity of the vessels’ standard trawl was compared with a trawl differing only in the belly length, being 37% shorter. The trawls had 40 mm bottom panels and cod ends of 35 mm mesh sizes. Eleven and 14 hauls were made, respectively, in 2017 aboard the 15 m vessel and in 2018 aboard the 27 m vessel. The trawls fished shrimp above 19 mm carapace length equally, while catch rates of shrimp below 15.5–16 mm carapace length in the shorter trawl were more than halved. The results were consistent between the two vessels. In short, modifying trawl length is a simple design modification that can reduce catches of small shrimp. Bycatch of Norway pout (Trisopterus esmarkii) was slightly reduced in the shorter trawl, unrelated to fish length. Article in Journal/Newspaper northern shrimp Pandalus borealis Canadian Science Publishing (via Crossref) Norway Canadian Journal of Fisheries and Aquatic Sciences 77 1 202 211 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Ingólfsson, Ólafur Arnar Jørgensen, Terje Shorter trawls improve size selection of northern shrimp |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Discards of small northern shrimp (Pandalus borealis) are a problem in the Skagerrak northern shrimp trawl fishery. To reduce catches of small shrimp, we studied the effect of trawl belly length on size selectivity in November 2017 and June 2018 onboard 15 and 27 m double-rigged shrimp trawlers. The selectivity of the vessels’ standard trawl was compared with a trawl differing only in the belly length, being 37% shorter. The trawls had 40 mm bottom panels and cod ends of 35 mm mesh sizes. Eleven and 14 hauls were made, respectively, in 2017 aboard the 15 m vessel and in 2018 aboard the 27 m vessel. The trawls fished shrimp above 19 mm carapace length equally, while catch rates of shrimp below 15.5–16 mm carapace length in the shorter trawl were more than halved. The results were consistent between the two vessels. In short, modifying trawl length is a simple design modification that can reduce catches of small shrimp. Bycatch of Norway pout (Trisopterus esmarkii) was slightly reduced in the shorter trawl, unrelated to fish length. |
format |
Article in Journal/Newspaper |
author |
Ingólfsson, Ólafur Arnar Jørgensen, Terje |
author_facet |
Ingólfsson, Ólafur Arnar Jørgensen, Terje |
author_sort |
Ingólfsson, Ólafur Arnar |
title |
Shorter trawls improve size selection of northern shrimp |
title_short |
Shorter trawls improve size selection of northern shrimp |
title_full |
Shorter trawls improve size selection of northern shrimp |
title_fullStr |
Shorter trawls improve size selection of northern shrimp |
title_full_unstemmed |
Shorter trawls improve size selection of northern shrimp |
title_sort |
shorter trawls improve size selection of northern shrimp |
publisher |
Canadian Science Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1139/cjfas-2018-0443 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2018-0443 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2018-0443 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
northern shrimp Pandalus borealis |
genre_facet |
northern shrimp Pandalus borealis |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 77, issue 1, page 202-211 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2018-0443 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
77 |
container_issue |
1 |
container_start_page |
202 |
op_container_end_page |
211 |
_version_ |
1785571384497274880 |