Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic
Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. Catchability is defined as the ratio of numbers caught between two trawls, s...
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Oxford University Press
2011
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ftiiasalaxendare:oai:pure.iiasa.ac.at:9625 2023-05-15T16:50:21+02:00 Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic Heino, M. Porteiro, F.M. Sutton, T.T. Falkenhaug, T. Godoe, O.R. Piatkowski, U. 2011-01 http://pure.iiasa.ac.at/id/eprint/9625/ unknown Oxford University Press Heino, M. <http://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Porteiro, F.M., Sutton, T.T., Falkenhaug, T., Godoe, O.R. <http://pure.iiasa.ac.at/view/iiasa/1287.html>, & Piatkowski, U. (2011). Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic. ICES Journal of Marine Science 68 (2) 377-389. 10.1093/icesjms/fsq089 <https://doi.org/10.1093/icesjms/fsq089>. Article PeerReviewed 2011 ftiiasalaxendare 2022-04-15T12:33:48Z Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. Catchability is defined as the ratio of numbers caught between two trawls, standardized for towed distance. Taxon-specific catchability coefficients were estimated for two large pelagic trawls with graded meshes, using a smaller pelagic trawl with a uniform mesh size as the reference trawl. Two of the trawls were equipped with multiple opening-closing codends that allowed sampling of different depth layers. Generalized linear and mixed models suggest that most of the taxa have catchabilities much lower than expected from the area of opening alone, indicating that only a few species are herded by the large mesh at the mouth of larger trawls. Catchability coefficients across taxa show a very large spread, indicating that the sampled volume for the larger trawls with graded meshes was highly taxon-specific. Part of this variability can be explained by body size and taxonomic group, the latter probably reflecting differences in body form and behaviour. The catchability estimates presented here form the basis for combining data for quantitative analyses of community structure. Article in Journal/Newspaper Iceland North Atlantic IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis) Mid-Atlantic Ridge |
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IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis) |
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ftiiasalaxendare |
language |
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description |
Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. Catchability is defined as the ratio of numbers caught between two trawls, standardized for towed distance. Taxon-specific catchability coefficients were estimated for two large pelagic trawls with graded meshes, using a smaller pelagic trawl with a uniform mesh size as the reference trawl. Two of the trawls were equipped with multiple opening-closing codends that allowed sampling of different depth layers. Generalized linear and mixed models suggest that most of the taxa have catchabilities much lower than expected from the area of opening alone, indicating that only a few species are herded by the large mesh at the mouth of larger trawls. Catchability coefficients across taxa show a very large spread, indicating that the sampled volume for the larger trawls with graded meshes was highly taxon-specific. Part of this variability can be explained by body size and taxonomic group, the latter probably reflecting differences in body form and behaviour. The catchability estimates presented here form the basis for combining data for quantitative analyses of community structure. |
format |
Article in Journal/Newspaper |
author |
Heino, M. Porteiro, F.M. Sutton, T.T. Falkenhaug, T. Godoe, O.R. Piatkowski, U. |
spellingShingle |
Heino, M. Porteiro, F.M. Sutton, T.T. Falkenhaug, T. Godoe, O.R. Piatkowski, U. Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic |
author_facet |
Heino, M. Porteiro, F.M. Sutton, T.T. Falkenhaug, T. Godoe, O.R. Piatkowski, U. |
author_sort |
Heino, M. |
title |
Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic |
title_short |
Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic |
title_full |
Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic |
title_fullStr |
Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic |
title_full_unstemmed |
Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic |
title_sort |
catchability of pelagic trawls for sampling deep-living nekton in the mid-north atlantic |
publisher |
Oxford University Press |
publishDate |
2011 |
url |
http://pure.iiasa.ac.at/id/eprint/9625/ |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_relation |
Heino, M. <http://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Porteiro, F.M., Sutton, T.T., Falkenhaug, T., Godoe, O.R. <http://pure.iiasa.ac.at/view/iiasa/1287.html>, & Piatkowski, U. (2011). Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic. ICES Journal of Marine Science 68 (2) 377-389. 10.1093/icesjms/fsq089 <https://doi.org/10.1093/icesjms/fsq089>. |
_version_ |
1766040518129614848 |