Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern Canada
The offshore Northern shrimp (Pandalus borealis) bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh codends. However, a recent rebound of juvenile redfish (Sebastes spp.), that can pass through the grids, has greatly i...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-11-01
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| Series: | Aquaculture and Fisheries |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468550X23000205 |
| _version_ | 1827280147933298688 |
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| author | Tomas Araya-Schmidt Shannon M. Bayse Paul D. Winger Colin H. Frank |
| author_facet | Tomas Araya-Schmidt Shannon M. Bayse Paul D. Winger Colin H. Frank |
| author_sort | Tomas Araya-Schmidt |
| collection | DOAJ |
| description | The offshore Northern shrimp (Pandalus borealis) bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh codends. However, a recent rebound of juvenile redfish (Sebastes spp.), that can pass through the grids, has greatly increased bycatch. To address this concern, this study investigated the effectiveness of 17 and 15 mm bar spacing Nordmøre grids in a twin-trawl (paired) configuration against the traditional 22 mm bar spacing grid. Size selectivity analyses showed that the 17 and 15 mm grids resulted in no significant reduction in shrimp catch across all length classes. The 17 mm grid significantly reduced redfish bycatch for all length classes and the 15 mm grid significantly reduced redfish bycatch for individuals larger than 95 mm total length. Less redfish entered the codend with the experimental grids, however, the overlap in width between redfish and Northern shrimp limits the overall sorting efficiency of the grids, leaving some redfish still vulnerable to capture. |
| first_indexed | 2024-04-09T17:20:11Z |
| format | Article |
| id | doaj.art-130e8fd4e7004a8281affd0f02542540 |
| institution | Directory Open Access Journal |
| issn | 2468-550X |
| language | English |
| last_indexed | 2024-04-24T08:31:58Z |
| publishDate | 2023-11-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Aquaculture and Fisheries |
| spelling | doaj.art-130e8fd4e7004a8281affd0f025425402024-04-16T19:18:31ZengKeAi Communications Co., Ltd.Aquaculture and Fisheries2468-550X2023-11-0186661671Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern CanadaTomas Araya-Schmidt0Shannon M. Bayse1Paul D. Winger2Colin H. Frank3Corresponding author.; Centre for Sustainable Aquatic Resources, Fisheries and Marine Institute, Memorial University of Newfoundland, St. John's, NL, A1C 5R3, CanadaCentre for Sustainable Aquatic Resources, Fisheries and Marine Institute, Memorial University of Newfoundland, St. John's, NL, A1C 5R3, CanadaCentre for Sustainable Aquatic Resources, Fisheries and Marine Institute, Memorial University of Newfoundland, St. John's, NL, A1C 5R3, CanadaCentre for Sustainable Aquatic Resources, Fisheries and Marine Institute, Memorial University of Newfoundland, St. John's, NL, A1C 5R3, CanadaThe offshore Northern shrimp (Pandalus borealis) bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh codends. However, a recent rebound of juvenile redfish (Sebastes spp.), that can pass through the grids, has greatly increased bycatch. To address this concern, this study investigated the effectiveness of 17 and 15 mm bar spacing Nordmøre grids in a twin-trawl (paired) configuration against the traditional 22 mm bar spacing grid. Size selectivity analyses showed that the 17 and 15 mm grids resulted in no significant reduction in shrimp catch across all length classes. The 17 mm grid significantly reduced redfish bycatch for all length classes and the 15 mm grid significantly reduced redfish bycatch for individuals larger than 95 mm total length. Less redfish entered the codend with the experimental grids, however, the overlap in width between redfish and Northern shrimp limits the overall sorting efficiency of the grids, leaving some redfish still vulnerable to capture.http://www.sciencedirect.com/science/article/pii/S2468550X23000205Size selectivityTwin trawlingCatch comparisonBycatch reduction device |
| spellingShingle | Tomas Araya-Schmidt Shannon M. Bayse Paul D. Winger Colin H. Frank Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern Canada Aquaculture and Fisheries Size selectivity Twin trawling Catch comparison Bycatch reduction device |
| title | Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern Canada |
| title_full | Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern Canada |
| title_fullStr | Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern Canada |
| title_full_unstemmed | Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern Canada |
| title_short | Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish (Sebastes spp.) in the offshore Northern shrimp (Pandalus borealis) fishery of eastern Canada |
| title_sort | smaller bar spacings in a nordmore grid reduces the bycatch of redfish sebastes spp in the offshore northern shrimp pandalus borealis fishery of eastern canada |
| topic | Size selectivity Twin trawling Catch comparison Bycatch reduction device |
| url | http://www.sciencedirect.com/science/article/pii/S2468550X23000205 |
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