Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations
Abstract Danish seining is an important fishing method used to harvest demersal species. Knowledge about the size selectivity of different demersal species with this type of fishing gear is therefore of importance for managing the exploitation of marine resources. However, there are only limited dat...
Published in: | Marine and Coastal Fisheries |
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Online Access: | http://dx.doi.org/10.1080/19425120.2016.1161682 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/19425120.2016.1161682 |
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crwiley:10.1080/19425120.2016.1161682 2024-06-23T07:51:04+00:00 Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations Herrmann, Bent Krag, Ludvig A. Feekings, Jordan Noack, Thomas Norges Forskningsråd Norwegian Seafood Research Fund Danish Directorate for Food, Fisheries, and Agri Buisness Research Council of Norway 2016 http://dx.doi.org/10.1080/19425120.2016.1161682 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/19425120.2016.1161682 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Marine and Coastal Fisheries volume 8, issue 1, page 277-291 ISSN 1942-5120 1942-5120 journal-article 2016 crwiley https://doi.org/10.1080/19425120.2016.1161682 2024-06-06T04:22:23Z Abstract Danish seining is an important fishing method used to harvest demersal species. Knowledge about the size selectivity of different demersal species with this type of fishing gear is therefore of importance for managing the exploitation of marine resources. However, there are only limited data on size selection in cod ends in this fishery. Sea trials were therefore carried out to collect size selectivity data for Atlantic Cod Gadus morhua , Haddock Melanogrammus aeglefinus , and Witch Flounder Glyptocephalus cynoglossus for a diamond‐mesh cod end. For all three species, the data were best described by a double logistic selection curve, implying that two different size selection processes occur in the cod end. The double selection process could be explained by an additional selection process occurring through slack meshes. The results imply that the escapement of 46% and 34% of the larger Atlantic Cod and Haddock (those above 48 cm), respectively, would be through wide‐open or slack meshes. Since these mesh states are only likely to be present in the latest stage of the fishing process (e.g., when the cod end is near the surface), a large fraction of the bigger fish probably escaped near the surface, which might influence their likelihood of survival. Furthermore, based on the models established for explaining the experimental size selection, we were able to predict the effect of changing the mesh size on cod end size selection in the Danish seine fishery. Received December 9, 2015; accepted February 18, 2016 Article in Journal/Newspaper atlantic cod Gadus morhua Wiley Online Library Marine and Coastal Fisheries 8 1 277 291 |
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Wiley Online Library |
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English |
description |
Abstract Danish seining is an important fishing method used to harvest demersal species. Knowledge about the size selectivity of different demersal species with this type of fishing gear is therefore of importance for managing the exploitation of marine resources. However, there are only limited data on size selection in cod ends in this fishery. Sea trials were therefore carried out to collect size selectivity data for Atlantic Cod Gadus morhua , Haddock Melanogrammus aeglefinus , and Witch Flounder Glyptocephalus cynoglossus for a diamond‐mesh cod end. For all three species, the data were best described by a double logistic selection curve, implying that two different size selection processes occur in the cod end. The double selection process could be explained by an additional selection process occurring through slack meshes. The results imply that the escapement of 46% and 34% of the larger Atlantic Cod and Haddock (those above 48 cm), respectively, would be through wide‐open or slack meshes. Since these mesh states are only likely to be present in the latest stage of the fishing process (e.g., when the cod end is near the surface), a large fraction of the bigger fish probably escaped near the surface, which might influence their likelihood of survival. Furthermore, based on the models established for explaining the experimental size selection, we were able to predict the effect of changing the mesh size on cod end size selection in the Danish seine fishery. Received December 9, 2015; accepted February 18, 2016 |
author2 |
Norges Forskningsråd Norwegian Seafood Research Fund Danish Directorate for Food, Fisheries, and Agri Buisness Research Council of Norway |
format |
Article in Journal/Newspaper |
author |
Herrmann, Bent Krag, Ludvig A. Feekings, Jordan Noack, Thomas |
spellingShingle |
Herrmann, Bent Krag, Ludvig A. Feekings, Jordan Noack, Thomas Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations |
author_facet |
Herrmann, Bent Krag, Ludvig A. Feekings, Jordan Noack, Thomas |
author_sort |
Herrmann, Bent |
title |
Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations |
title_short |
Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations |
title_full |
Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations |
title_fullStr |
Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations |
title_full_unstemmed |
Understanding and Predicting Size Selection in Diamond‐Mesh Cod Ends for Danish Seining: A Study Based on Sea Trials and Computer Simulations |
title_sort |
understanding and predicting size selection in diamond‐mesh cod ends for danish seining: a study based on sea trials and computer simulations |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1080/19425120.2016.1161682 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/19425120.2016.1161682 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Marine and Coastal Fisheries volume 8, issue 1, page 277-291 ISSN 1942-5120 1942-5120 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1080/19425120.2016.1161682 |
container_title |
Marine and Coastal Fisheries |
container_volume |
8 |
container_issue |
1 |
container_start_page |
277 |
op_container_end_page |
291 |
_version_ |
1802642064210395136 |