Size selective capture of Atlantic cod (Gadus morhua) in floating pots
Little is known about the size selectivity of cod in static fishing gears such as pots and traps. In this field study, floating fishing pots were equipped with 40, 45 and 50 mm square mesh escape windows in order to estimate the size selectivity of cod at different mesh sizes. Relationships between...
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2011
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Online Access: | https://lup.lub.lu.se/record/1872949 https://doi.org/10.1016/j.fishres.2010.10.023 |
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ftulundlup:oai:lup.lub.lu.se:d4427658-9f41-43a9-a23a-30ceb70941ed 2023-05-15T15:27:47+02:00 Size selective capture of Atlantic cod (Gadus morhua) in floating pots Ovegard, M Konigson, S. Persson, Anders Lunneryd, S. G. 2011 https://lup.lub.lu.se/record/1872949 https://doi.org/10.1016/j.fishres.2010.10.023 eng eng Elsevier https://lup.lub.lu.se/record/1872949 http://dx.doi.org/10.1016/j.fishres.2010.10.023 wos:000287113600026 scopus:78650311109 Fisheries Research; 107(1-3), pp 239-244 (2011) ISSN: 0165-7836 Ecology Escape window Size selection Select model Gadus morhua Floating pots contributiontojournal/article info:eu-repo/semantics/article text 2011 ftulundlup https://doi.org/10.1016/j.fishres.2010.10.023 2023-02-01T23:29:27Z Little is known about the size selectivity of cod in static fishing gears such as pots and traps. In this field study, floating fishing pots were equipped with 40, 45 and 50 mm square mesh escape windows in order to estimate the size selectivity of cod at different mesh sizes. Relationships between selectivity parameters and mesh size, as well as an optimal mesh size for the escape window with respect to current minimum landing size of cod in the Baltic Sea were sought. The results show that the floating pot is not only species selective when used in the Baltic Sea cod fishery, the implementation of an escape window reduced the proportion of undersized bycatch in the pots by more than 90%. The estimated length at 50% retention was found to be a direct function of fish body length (girth) and mesh size of the escape window, while the estimated selection range remained unchanged regardless of mesh size. Optimal mesh size, with respect to the length at 50% retention and current minimal landing size of 38 cm in the Baltic, was determined to be 45 mm. Strong indications (significant on the 0.01 probability level in the case of 50 and 40 mm escape windows) suggested that the relative fishing power of the pots increased with the implementation of an escape window. This result could be explained as a "saturation effect", i.e. the probability of cod entering the pot is likely to be negatively dependent on cod density in the pot. The high species selectivity and the low catch rate of undersized fish have consolidated the floating pots position as a highly benign fishing method and the foremost alternative gear for the future coastal cod fishery in the Baltic Sea. (C) 2010 Elsevier B.V. All rights reserved. Article in Journal/Newspaper atlantic cod Gadus morhua Lund University Publications (LUP) Fisheries Research 107 1-3 239 244 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology Escape window Size selection Select model Gadus morhua Floating pots |
spellingShingle |
Ecology Escape window Size selection Select model Gadus morhua Floating pots Ovegard, M Konigson, S. Persson, Anders Lunneryd, S. G. Size selective capture of Atlantic cod (Gadus morhua) in floating pots |
topic_facet |
Ecology Escape window Size selection Select model Gadus morhua Floating pots |
description |
Little is known about the size selectivity of cod in static fishing gears such as pots and traps. In this field study, floating fishing pots were equipped with 40, 45 and 50 mm square mesh escape windows in order to estimate the size selectivity of cod at different mesh sizes. Relationships between selectivity parameters and mesh size, as well as an optimal mesh size for the escape window with respect to current minimum landing size of cod in the Baltic Sea were sought. The results show that the floating pot is not only species selective when used in the Baltic Sea cod fishery, the implementation of an escape window reduced the proportion of undersized bycatch in the pots by more than 90%. The estimated length at 50% retention was found to be a direct function of fish body length (girth) and mesh size of the escape window, while the estimated selection range remained unchanged regardless of mesh size. Optimal mesh size, with respect to the length at 50% retention and current minimal landing size of 38 cm in the Baltic, was determined to be 45 mm. Strong indications (significant on the 0.01 probability level in the case of 50 and 40 mm escape windows) suggested that the relative fishing power of the pots increased with the implementation of an escape window. This result could be explained as a "saturation effect", i.e. the probability of cod entering the pot is likely to be negatively dependent on cod density in the pot. The high species selectivity and the low catch rate of undersized fish have consolidated the floating pots position as a highly benign fishing method and the foremost alternative gear for the future coastal cod fishery in the Baltic Sea. (C) 2010 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Ovegard, M Konigson, S. Persson, Anders Lunneryd, S. G. |
author_facet |
Ovegard, M Konigson, S. Persson, Anders Lunneryd, S. G. |
author_sort |
Ovegard, M |
title |
Size selective capture of Atlantic cod (Gadus morhua) in floating pots |
title_short |
Size selective capture of Atlantic cod (Gadus morhua) in floating pots |
title_full |
Size selective capture of Atlantic cod (Gadus morhua) in floating pots |
title_fullStr |
Size selective capture of Atlantic cod (Gadus morhua) in floating pots |
title_full_unstemmed |
Size selective capture of Atlantic cod (Gadus morhua) in floating pots |
title_sort |
size selective capture of atlantic cod (gadus morhua) in floating pots |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://lup.lub.lu.se/record/1872949 https://doi.org/10.1016/j.fishres.2010.10.023 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Fisheries Research; 107(1-3), pp 239-244 (2011) ISSN: 0165-7836 |
op_relation |
https://lup.lub.lu.se/record/1872949 http://dx.doi.org/10.1016/j.fishres.2010.10.023 wos:000287113600026 scopus:78650311109 |
op_doi |
https://doi.org/10.1016/j.fishres.2010.10.023 |
container_title |
Fisheries Research |
container_volume |
107 |
container_issue |
1-3 |
container_start_page |
239 |
op_container_end_page |
244 |
_version_ |
1766358191819456512 |