Size selection of Antarctic krill (Euphausia superba) in trawls
Trawlers involved in the Antarctic krill (Euphausia superba) fishery use different trawl designs, and very little is known about the size selectivity of the various gears. Size selectivity quantifies a given trawl's ability to catch different sizes of a harvested entity, and this information is...
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| Veröffentlicht in: | PloS one 2014-08, Vol.9 (8), p.e102168-e102168 |
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| creator | Krag, Ludvig A Herrmann, Bent Iversen, Svein A Engås, Arill Nordrum, Sigve Krafft, Bjørn A |
| description | Trawlers involved in the Antarctic krill (Euphausia superba) fishery use different trawl designs, and very little is known about the size selectivity of the various gears. Size selectivity quantifies a given trawl's ability to catch different sizes of a harvested entity, and this information is crucial for the management of a sustainable fishery. We established a morphological description of krill and used it in a mathematical model (FISHSELECT) to predict the selective potential of diamond meshes measuring 5-40 mm with mesh opening angles (oa) ranging from 10 to 90°. We expected the majority of krill to encounter the trawl netting in random orientations due to high towing speeds and the assumed swimming capabilities of krill. However, our results indicated that size selectivity of krill is a well-defined process in which individuals encounter meshes at an optimal orientation for escapement. The simulation-based results were supported by data from experimental trawl hauls and underwater video images of the mesh geometry during fishing. Herein we present predictions for the size selectivity of a range of netting configurations relevant to the krill fishery. The methods developed and results described are important tools for selecting optimal trawl designs for krill fishing. |
| doi_str_mv | 10.1371/journal.pone.0102168 |
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Size selectivity quantifies a given trawl's ability to catch different sizes of a harvested entity, and this information is crucial for the management of a sustainable fishery. We established a morphological description of krill and used it in a mathematical model (FISHSELECT) to predict the selective potential of diamond meshes measuring 5-40 mm with mesh opening angles (oa) ranging from 10 to 90°. We expected the majority of krill to encounter the trawl netting in random orientations due to high towing speeds and the assumed swimming capabilities of krill. However, our results indicated that size selectivity of krill is a well-defined process in which individuals encounter meshes at an optimal orientation for escapement. The simulation-based results were supported by data from experimental trawl hauls and underwater video images of the mesh geometry during fishing. Herein we present predictions for the size selectivity of a range of netting configurations relevant to the krill fishery. The methods developed and results described are important tools for selecting optimal trawl designs for krill fishing.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0102168</identifier><identifier>PMID: 25105960</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Angles (geometry) ; Animals ; Antarctic Regions ; Biology and Life Sciences ; Body Size - physiology ; Commercial fishing ; Computer simulation ; Conservation of Natural Resources - methods ; Crustacea ; Crustaceans ; Design ; Diamonds ; Euphausia superba ; Euphausiacea ; Euphausiacea - growth & development ; Finite element method ; Fish ; Fisheries ; Fisheries - instrumentation ; Fisheries - methods ; Fisheries - standards ; Fishing ; Gadinae ; Krill ; Mathematical models ; Mathematics ; Models, Theoretical ; Nephrops norvegicus ; Netting (materials/structures) ; Polar environments ; Reinhardtius hippoglossoides ; Selectivity ; Studies ; Sustainable fisheries ; Swimming ; Trawlers ; Trawls ; Underwater</subject><ispartof>PloS one, 2014-08, Vol.9 (8), p.e102168-e102168</ispartof><rights>2014 Krag et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Herein we present predictions for the size selectivity of a range of netting configurations relevant to the krill fishery. The methods developed and results described are important tools for selecting optimal trawl designs for krill fishing.</description><subject>Angles (geometry)</subject><subject>Animals</subject><subject>Antarctic Regions</subject><subject>Biology and Life Sciences</subject><subject>Body Size - physiology</subject><subject>Commercial fishing</subject><subject>Computer simulation</subject><subject>Conservation of Natural Resources - methods</subject><subject>Crustacea</subject><subject>Crustaceans</subject><subject>Design</subject><subject>Diamonds</subject><subject>Euphausia superba</subject><subject>Euphausiacea</subject><subject>Euphausiacea - growth & development</subject><subject>Finite element method</subject><subject>Fish</subject><subject>Fisheries</subject><subject>Fisheries - instrumentation</subject><subject>Fisheries - methods</subject><subject>Fisheries - standards</subject><subject>Fishing</subject><subject>Gadinae</subject><subject>Krill</subject><subject>Mathematical models</subject><subject>Mathematics</subject><subject>Models, Theoretical</subject><subject>Nephrops norvegicus</subject><subject>Netting (materials/structures)</subject><subject>Polar environments</subject><subject>Reinhardtius hippoglossoides</subject><subject>Selectivity</subject><subject>Studies</subject><subject>Sustainable fisheries</subject><subject>Swimming</subject><subject>Trawlers</subject><subject>Trawls</subject><subject>Underwater</subject><issn>1932-6203</issn><issn>1932-6203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>DOA</sourceid><recordid>eNptUktv1DAYtBCIlsI_QBCJS3vYxe_YF1BVlVKpEgfgbDn2l9aLNw52AoJfj5dNqxbhi18z4xl5EHpJ8JqwlrzdpDkPNq7HNMAaE0yJVI_QIdGMriTF7PG99QF6VsoGY8GUlE_RARUECy3xIXr_OfyGpkAEN4U0NKlvTofJ5rpzzbccYmyOz-fxxs4l2KbMI-TOnjRhaKZsf8byHD3pbSzwYpmP0NcP51_OPq6uPl1cnp1erZygcloxoXvftlo77SkH65wSpA7XScecaIGBbRVpMWPcd8pT1UvOhbW861zPNTtCr_e6Y0zFLNmLIUJQwpjioiIu9wif7MaMOWxt_mWSDebvQcrXxuaaKoLxrSMWhOyYV1z1nfY9hp5xq7n3WkLVere8Nndb8A6GmjY-EH14M4Qbc51-GE6olGJn93gRyOn7DGUy21AcxGgHSPPet8L1a3CFvvkH-v90fI9yOZWSob8zQ7DZ9eGWZXZ9MEsfKu3V_SB3pNsCsD-tpLOJ</recordid><startdate>20140808</startdate><enddate>20140808</enddate><creator>Krag, Ludvig A</creator><creator>Herrmann, Bent</creator><creator>Iversen, Svein A</creator><creator>Engås, Arill</creator><creator>Nordrum, Sigve</creator><creator>Krafft, Bjørn A</creator><general>Public Library of Science</general><general>Public Library of Science (PLoS)</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QG</scope><scope>7QL</scope><scope>7QO</scope><scope>7RV</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TG</scope><scope>7TM</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB.</scope><scope>KB0</scope><scope>KL.</scope><scope>L6V</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>M7S</scope><scope>NAPCQ</scope><scope>P5Z</scope><scope>P62</scope><scope>P64</scope><scope>PATMY</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope></search><sort><creationdate>20140808</creationdate><title>Size selection of Antarctic krill (Euphausia superba) in trawls</title><author>Krag, Ludvig A ; Herrmann, Bent ; Iversen, Svein A ; Engås, Arill ; Nordrum, Sigve ; Krafft, Bjørn A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c526t-359fd7799c9d24eacc851111cb6c3c57e3ea78170334db8d28f6445aa4bbcf493</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Angles (geometry)</topic><topic>Animals</topic><topic>Antarctic Regions</topic><topic>Biology and Life Sciences</topic><topic>Body Size - 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Krag, Ludvig A</au><au>Herrmann, Bent</au><au>Iversen, Svein A</au><au>Engås, Arill</au><au>Nordrum, Sigve</au><au>Krafft, Bjørn A</au><au>Stergiou, Konstantinos I.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Size selection of Antarctic krill (Euphausia superba) in trawls</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2014-08-08</date><risdate>2014</risdate><volume>9</volume><issue>8</issue><spage>e102168</spage><epage>e102168</epage><pages>e102168-e102168</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Trawlers involved in the Antarctic krill (Euphausia superba) fishery use different trawl designs, and very little is known about the size selectivity of the various gears. Size selectivity quantifies a given trawl's ability to catch different sizes of a harvested entity, and this information is crucial for the management of a sustainable fishery. We established a morphological description of krill and used it in a mathematical model (FISHSELECT) to predict the selective potential of diamond meshes measuring 5-40 mm with mesh opening angles (oa) ranging from 10 to 90°. We expected the majority of krill to encounter the trawl netting in random orientations due to high towing speeds and the assumed swimming capabilities of krill. However, our results indicated that size selectivity of krill is a well-defined process in which individuals encounter meshes at an optimal orientation for escapement. The simulation-based results were supported by data from experimental trawl hauls and underwater video images of the mesh geometry during fishing. Herein we present predictions for the size selectivity of a range of netting configurations relevant to the krill fishery. The methods developed and results described are important tools for selecting optimal trawl designs for krill fishing.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>25105960</pmid><doi>10.1371/journal.pone.0102168</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Angles (geometry) Animals Antarctic Regions Biology and Life Sciences Body Size - physiology Commercial fishing Computer simulation Conservation of Natural Resources - methods Crustacea Crustaceans Design Diamonds Euphausia superba Euphausiacea Euphausiacea - growth & development Finite element method Fish Fisheries Fisheries - instrumentation Fisheries - methods Fisheries - standards Fishing Gadinae Krill Mathematical models Mathematics Models, Theoretical Nephrops norvegicus Netting (materials/structures) Polar environments Reinhardtius hippoglossoides Selectivity Studies Sustainable fisheries Swimming Trawlers Trawls Underwater |
| title | Size selection of Antarctic krill (Euphausia superba) in trawls |
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