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Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery

The introduction of the Nordmøre grid in shrimp trawls has reduced the bycatch of non-target species. In the Norwegian Northern shrimp (Pandalus borealis) fishery, the mandatory selective gear consists of a Nordmøre grid with 19 mm bar spacing combined with a 35 mm mesh size diamond mesh codend. How...

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Autores principales: Larsen, Roger B., Herrmann, Bent, Sistiaga, Manu, Brinkhof, Jesse, Cerbule, Kristine, Grimaldo, Eduardo, Lomeli, Mark J. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9794079/
https://www.ncbi.nlm.nih.gov/pubmed/36574403
http://dx.doi.org/10.1371/journal.pone.0277788
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author Larsen, Roger B.
Herrmann, Bent
Sistiaga, Manu
Brinkhof, Jesse
Cerbule, Kristine
Grimaldo, Eduardo
Lomeli, Mark J. M.
author_facet Larsen, Roger B.
Herrmann, Bent
Sistiaga, Manu
Brinkhof, Jesse
Cerbule, Kristine
Grimaldo, Eduardo
Lomeli, Mark J. M.
author_sort Larsen, Roger B.
collection PubMed
description The introduction of the Nordmøre grid in shrimp trawls has reduced the bycatch of non-target species. In the Norwegian Northern shrimp (Pandalus borealis) fishery, the mandatory selective gear consists of a Nordmøre grid with 19 mm bar spacing combined with a 35 mm mesh size diamond mesh codend. However, fish bycatch in shrimp trawls remains a challenge and further modifications of the gear that can improve selectivity are still sought. Therefore, this study estimated and compared the size selectivity of Nordmøre grids with bar spacings of 17 and 21 mm. Further, the effect of applying these two grids on trawl size selectivity was predicted and compared to the legislated gear configuration. Experimental fishing trials were conducted in the Barents Sea where the bottom trawl fleet targets Northern shrimp. Results were obtained for the target species and two by-catch species: cod (Gadus morhua) and American plaice (Hippoglossoides platessoides). This study demonstrated that reducing bar spacing can significantly reduce fish bycatch while only marginally affecting catch efficiency of Northern shrimp. This is a potentially important finding from a management perspective that could be applicable to other shrimp fisheries where flexibility in the use of different grid bar spacings may be beneficial to maximize the reduction of unwanted bycatch while minimizing the loss of target species.
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spelling pubmed-97940792022-12-28 Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Brinkhof, Jesse Cerbule, Kristine Grimaldo, Eduardo Lomeli, Mark J. M. PLoS One Research Article The introduction of the Nordmøre grid in shrimp trawls has reduced the bycatch of non-target species. In the Norwegian Northern shrimp (Pandalus borealis) fishery, the mandatory selective gear consists of a Nordmøre grid with 19 mm bar spacing combined with a 35 mm mesh size diamond mesh codend. However, fish bycatch in shrimp trawls remains a challenge and further modifications of the gear that can improve selectivity are still sought. Therefore, this study estimated and compared the size selectivity of Nordmøre grids with bar spacings of 17 and 21 mm. Further, the effect of applying these two grids on trawl size selectivity was predicted and compared to the legislated gear configuration. Experimental fishing trials were conducted in the Barents Sea where the bottom trawl fleet targets Northern shrimp. Results were obtained for the target species and two by-catch species: cod (Gadus morhua) and American plaice (Hippoglossoides platessoides). This study demonstrated that reducing bar spacing can significantly reduce fish bycatch while only marginally affecting catch efficiency of Northern shrimp. This is a potentially important finding from a management perspective that could be applicable to other shrimp fisheries where flexibility in the use of different grid bar spacings may be beneficial to maximize the reduction of unwanted bycatch while minimizing the loss of target species. Public Library of Science 2022-12-27 /pmc/articles/PMC9794079/ /pubmed/36574403 http://dx.doi.org/10.1371/journal.pone.0277788 Text en © 2022 Larsen et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Larsen, Roger B.
Herrmann, Bent
Sistiaga, Manu
Brinkhof, Jesse
Cerbule, Kristine
Grimaldo, Eduardo
Lomeli, Mark J. M.
Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery
title Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery
title_full Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery
title_fullStr Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery
title_full_unstemmed Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery
title_short Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery
title_sort effect of the nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the barents sea northern shrimp fishery
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9794079/
https://www.ncbi.nlm.nih.gov/pubmed/36574403
http://dx.doi.org/10.1371/journal.pone.0277788
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