Species selectivity in different sized topless trawl designs: Does size matter?
Most demersal trawl fisheries are conducted in a multispecies setting, and the catch consists of several different species. An inherent challenge in such fisheries is to provide both biologically and economically sustainable exploitation of individually fluctuating stocks and vessel- or fleet-specif...
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ftopenagrar:oai:www.openagrar.de:timport_mods_00034423 2023-05-15T15:27:41+02:00 Species selectivity in different sized topless trawl designs: Does size matter? Krag, Ludvig Ahm Herrmann, Bent Karlsen, Junita Mieske, Bernd 2015 6 https://doi.org/10.1016/j.fishres.2015.07.010 https://www.openagrar.de/receive/timport_mods_00034423 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00034423/dn055552.pdf eng eng Fisheries research : an international journal on fisheries science, fishing technology and fisheries management -- FISH RES (AMST) -- 0165-7836 -- 1497860-x -- 406532-3 -- http://www.bibliothek.uni-regensburg.de/ezeit/?1497860 -- http://www.sciencedirect.com/science/journal/01657836 https://doi.org/DOI:10.1016/j.fishres.2015.07.010 https://www.openagrar.de/receive/timport_mods_00034423 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00034423/dn055552.pdf only signed in user info:eu-repo/semantics/openAccess Text topless trawls species separation cod (Gadus morhua) mixed fisheries fish behaviour article Text 2015 ftopenagrar https://doi.org/10.1016/j.fishres.2015.07.010 2023-03-06T00:04:35Z Most demersal trawl fisheries are conducted in a multispecies setting, and the catch consists of several different species. An inherent challenge in such fisheries is to provide both biologically and economically sustainable exploitation of individually fluctuating stocks and vessel- or fleet-specific quotas. The topless trawl design was developed to improve species-specific selectivity in such fisheries. In a topless trawl, the foot rope is located more forward than the headline to allow fish to escape upwards, whereas the headline is located in front in traditional trawl designs. In this study we conducted twin trawls with a topless trawl towed parallel to a similar standard trawl; we tested a topless trawl design on a small trawl with a low headline height and on a larger trawl with a high headline height. We conducted the tows in the Nephrops (Nephrops norvegicus) directed mixed fisheries. For both the small and large trawls, we found a significant topless effect for haddock (Melanogramus aeglefinus) and no effect for Nephrops. For Atlantic cod (Gadus morhua) we found a significant topless effect for the low headline trawl but no effect for the high headline trawl. In both the eastern and western Atlantic, topless trawls have been introduced as legal cod-selective trawl designs. However, this study demonstrates that identical gear modifications made to similar trawls of different sizes and used in the same fishery can lead to different results. Article in Journal/Newspaper atlantic cod Gadus morhua OpenAgrar (OA) Fisheries Research 172 243 249 |
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Text topless trawls species separation cod (Gadus morhua) mixed fisheries fish behaviour |
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Text topless trawls species separation cod (Gadus morhua) mixed fisheries fish behaviour Krag, Ludvig Ahm Herrmann, Bent Karlsen, Junita Mieske, Bernd Species selectivity in different sized topless trawl designs: Does size matter? |
topic_facet |
Text topless trawls species separation cod (Gadus morhua) mixed fisheries fish behaviour |
description |
Most demersal trawl fisheries are conducted in a multispecies setting, and the catch consists of several different species. An inherent challenge in such fisheries is to provide both biologically and economically sustainable exploitation of individually fluctuating stocks and vessel- or fleet-specific quotas. The topless trawl design was developed to improve species-specific selectivity in such fisheries. In a topless trawl, the foot rope is located more forward than the headline to allow fish to escape upwards, whereas the headline is located in front in traditional trawl designs. In this study we conducted twin trawls with a topless trawl towed parallel to a similar standard trawl; we tested a topless trawl design on a small trawl with a low headline height and on a larger trawl with a high headline height. We conducted the tows in the Nephrops (Nephrops norvegicus) directed mixed fisheries. For both the small and large trawls, we found a significant topless effect for haddock (Melanogramus aeglefinus) and no effect for Nephrops. For Atlantic cod (Gadus morhua) we found a significant topless effect for the low headline trawl but no effect for the high headline trawl. In both the eastern and western Atlantic, topless trawls have been introduced as legal cod-selective trawl designs. However, this study demonstrates that identical gear modifications made to similar trawls of different sizes and used in the same fishery can lead to different results. |
format |
Article in Journal/Newspaper |
author |
Krag, Ludvig Ahm Herrmann, Bent Karlsen, Junita Mieske, Bernd |
author_facet |
Krag, Ludvig Ahm Herrmann, Bent Karlsen, Junita Mieske, Bernd |
author_sort |
Krag, Ludvig Ahm |
title |
Species selectivity in different sized topless trawl designs: Does size matter? |
title_short |
Species selectivity in different sized topless trawl designs: Does size matter? |
title_full |
Species selectivity in different sized topless trawl designs: Does size matter? |
title_fullStr |
Species selectivity in different sized topless trawl designs: Does size matter? |
title_full_unstemmed |
Species selectivity in different sized topless trawl designs: Does size matter? |
title_sort |
species selectivity in different sized topless trawl designs: does size matter? |
publishDate |
2015 |
url |
https://doi.org/10.1016/j.fishres.2015.07.010 https://www.openagrar.de/receive/timport_mods_00034423 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00034423/dn055552.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
Fisheries research : an international journal on fisheries science, fishing technology and fisheries management -- FISH RES (AMST) -- 0165-7836 -- 1497860-x -- 406532-3 -- http://www.bibliothek.uni-regensburg.de/ezeit/?1497860 -- http://www.sciencedirect.com/science/journal/01657836 https://doi.org/DOI:10.1016/j.fishres.2015.07.010 https://www.openagrar.de/receive/timport_mods_00034423 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00034423/dn055552.pdf |
op_rights |
only signed in user info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.fishres.2015.07.010 |
container_title |
Fisheries Research |
container_volume |
172 |
container_start_page |
243 |
op_container_end_page |
249 |
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1766358109225222144 |