Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries?
Several shrimp trawl fisheries use a Nordmore 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...
Published in: | PLOS ONE |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Public Library Science
2021
|
Subjects: | |
Online Access: | https://hdl.handle.net/11454/77910 https://doi.org/10.1371/journal.pone.0249172 |
id |
ftunivege:oai:acikerisim.ege.edu.tr:11454/77910 |
---|---|
record_format |
openpolar |
spelling |
ftunivege:oai:acikerisim.ege.edu.tr:11454/77910 2023-05-15T15:45:45+02:00 Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? Larsen, Roger B. Herrmann, Bent Brcic, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kare Nolde Jacques, Nadine 2021 https://hdl.handle.net/11454/77910 https://doi.org/10.1371/journal.pone.0249172 en eng Public Library Science Plos One Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı 1932-6203 https://doi.org/10.1371/journal.pone.0249172 https://hdl.handle.net/11454/77910 doi:10.1371/journal.pone.0249172 16 3 WOS:000634833500031 33770115 info:eu-repo/semantics/openAccess Redfish Sebastes Spp Size Selection Nephrops-Norvegicus Pink Shrimp By-Catch Fish Design Behavior Panel Article 2021 ftunivege https://doi.org/10.1371/journal.pone.0249172 2023-01-19T17:47:38Z Several shrimp trawl fisheries use a Nordmore 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 Nordmore 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 Nordmore grid combined with a 35 mm codend would result in a significant reduction in bycatch with only minor loss of shrimp. Norwegian Seafood Research Fund (FHF project) [901303]; UiT The Arctic University of Norway We are grateful to the Norwegian Seafood Research Fund (FHF project number 901303) for funding the experiments. The publication charges for this article have been funded by a grant from the publication fund of UiT The Arctic University of Norway. Article in Journal/Newspaper Boreogadus saida Gadus morhua Pandalus borealis polar cod Arctic University of Norway UiT The Arctic University of Norway Ege University Institutional Repository Arctic Norway PLOS ONE 16 3 e0249172 |
institution |
Open Polar |
collection |
Ege University Institutional Repository |
op_collection_id |
ftunivege |
language |
English |
topic |
Redfish Sebastes Spp Size Selection Nephrops-Norvegicus Pink Shrimp By-Catch Fish Design Behavior Panel |
spellingShingle |
Redfish Sebastes Spp Size Selection Nephrops-Norvegicus Pink Shrimp By-Catch Fish Design Behavior Panel Larsen, Roger B. Herrmann, Bent Brcic, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kare Nolde Jacques, Nadine Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? |
topic_facet |
Redfish Sebastes Spp Size Selection Nephrops-Norvegicus Pink Shrimp By-Catch Fish Design Behavior Panel |
description |
Several shrimp trawl fisheries use a Nordmore 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 Nordmore 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 Nordmore grid combined with a 35 mm codend would result in a significant reduction in bycatch with only minor loss of shrimp. Norwegian Seafood Research Fund (FHF project) [901303]; UiT The Arctic University of Norway We are grateful to the Norwegian Seafood Research Fund (FHF project number 901303) for funding the experiments. The publication charges for this article have been funded by a grant from the publication fund of UiT The Arctic University of Norway. |
format |
Article in Journal/Newspaper |
author |
Larsen, Roger B. Herrmann, Bent Brcic, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kare Nolde Jacques, Nadine |
author_facet |
Larsen, Roger B. Herrmann, Bent Brcic, Jure Sistiaga, Manu Cerbule, Kristine Nielsen, Kare Nolde Jacques, Nadine |
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 Science |
publishDate |
2021 |
url |
https://hdl.handle.net/11454/77910 https://doi.org/10.1371/journal.pone.0249172 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Boreogadus saida Gadus morhua Pandalus borealis polar cod Arctic University of Norway UiT The Arctic University of Norway |
genre_facet |
Boreogadus saida Gadus morhua Pandalus borealis polar cod Arctic University of Norway UiT The Arctic University of Norway |
op_relation |
Plos One Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı 1932-6203 https://doi.org/10.1371/journal.pone.0249172 https://hdl.handle.net/11454/77910 doi:10.1371/journal.pone.0249172 16 3 WOS:000634833500031 33770115 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1371/journal.pone.0249172 |
container_title |
PLOS ONE |
container_volume |
16 |
container_issue |
3 |
container_start_page |
e0249172 |
_version_ |
1766380306062901248 |