Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries?
Several shrimp trawl fisheries use a Nordmöre sorting grid to avoid bycatch of fish. However, small fish can pass through the grid. Therefore, the retention of juvenile fish often remains an issue during shrimp trawling. We investigated the vertical distribution of deepwater shrimp (Pandalus boreali...
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Online Access: | https://doi.org/10.1371/journal.pone.0249172 https://pubmed.ncbi.nlm.nih.gov/33770115 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7996985/ |
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ftpubmed:33770115 2024-09-15T18:00:11+00:00 Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? Larsen, Roger B Herrmann, Bent Brčić, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kåre Nolde Jacques, Nadine Lomeli, Mark J M Tokaç, Adnan Cuende, Elsa 2021 https://doi.org/10.1371/journal.pone.0249172 https://pubmed.ncbi.nlm.nih.gov/33770115 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7996985/ eng eng Public Library of Science https://doi.org/10.1371/journal.pone.0249172 https://pubmed.ncbi.nlm.nih.gov/33770115 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7996985/ PLoS One ISSN:1932-6203 Volume:16 Issue:3 Journal Article 2021 ftpubmed https://doi.org/10.1371/journal.pone.0249172 2024-07-25T16:05:00Z Several shrimp trawl fisheries use a Nordmöre sorting grid to avoid bycatch of fish. However, small fish can pass through the grid. Therefore, the retention of juvenile fish often remains an issue during shrimp trawling. We investigated the vertical distribution of deepwater shrimp (Pandalus borealis) and dominant bycatch species at the point where the Nordmöre grid section is installed. This was achieved using a separator frame which split the net vertically into three compartments of equal entry size. Our results showed that shrimp predominately follow the lower part of the trawl belly, whereas species such as redfish (Sebastes spp.), cod (Gadus morhua), polar cod (Boreogadus saida) and American plaice (Hippoglossoides platessoides) preferred the mid-section in the aft of the trawl. Haddock (Melanogrammus aeglefinus) primarily entered through the upper section of the trawl belly. Using these results, we predict that a vertical separation device installed forward of a 19 mm Nordmöre grid combined with a 35 mm codend would result in a significant reduction in bycatch with only minor loss of shrimp. Article in Journal/Newspaper Boreogadus saida Gadus morhua Pandalus borealis polar cod PubMed Central (PMC) PLOS ONE 16 3 e0249172 |
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description |
Several shrimp trawl fisheries use a Nordmöre sorting grid to avoid bycatch of fish. However, small fish can pass through the grid. Therefore, the retention of juvenile fish often remains an issue during shrimp trawling. We investigated the vertical distribution of deepwater shrimp (Pandalus borealis) and dominant bycatch species at the point where the Nordmöre grid section is installed. This was achieved using a separator frame which split the net vertically into three compartments of equal entry size. Our results showed that shrimp predominately follow the lower part of the trawl belly, whereas species such as redfish (Sebastes spp.), cod (Gadus morhua), polar cod (Boreogadus saida) and American plaice (Hippoglossoides platessoides) preferred the mid-section in the aft of the trawl. Haddock (Melanogrammus aeglefinus) primarily entered through the upper section of the trawl belly. Using these results, we predict that a vertical separation device installed forward of a 19 mm Nordmöre grid combined with a 35 mm codend would result in a significant reduction in bycatch with only minor loss of shrimp. |
format |
Article in Journal/Newspaper |
author |
Larsen, Roger B Herrmann, Bent Brčić, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kåre Nolde Jacques, Nadine Lomeli, Mark J M Tokaç, Adnan Cuende, Elsa |
spellingShingle |
Larsen, Roger B Herrmann, Bent Brčić, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kåre Nolde Jacques, Nadine Lomeli, Mark J M Tokaç, Adnan Cuende, Elsa Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
author_facet |
Larsen, Roger B Herrmann, Bent Brčić, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kåre Nolde Jacques, Nadine Lomeli, Mark J M Tokaç, Adnan Cuende, Elsa |
author_sort |
Larsen, Roger B |
title |
Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
title_short |
Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
title_full |
Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
title_fullStr |
Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
title_full_unstemmed |
Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
title_sort |
can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
publisher |
Public Library of Science |
publishDate |
2021 |
url |
https://doi.org/10.1371/journal.pone.0249172 https://pubmed.ncbi.nlm.nih.gov/33770115 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7996985/ |
genre |
Boreogadus saida Gadus morhua Pandalus borealis polar cod |
genre_facet |
Boreogadus saida Gadus morhua Pandalus borealis polar cod |
op_source |
PLoS One ISSN:1932-6203 Volume:16 Issue:3 |
op_relation |
https://doi.org/10.1371/journal.pone.0249172 https://pubmed.ncbi.nlm.nih.gov/33770115 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7996985/ |
op_doi |
https://doi.org/10.1371/journal.pone.0249172 |
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PLOS ONE |
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16 |
container_issue |
3 |
container_start_page |
e0249172 |
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