Testing of a helix twine off-bottom trawl on Georges Bank
The massive biomass of Eastern Georges Bank haddock ( Melanogrammus aeglefinus ) is difficult to harvest without capturing less robust, but still valuable groundfish stocks like Atlantic cod ( Gadus morhua ) and some flatfish species. Specialized haddock trawls that raise the mouth of the nets off-b...
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2023
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Online Access: | http://dx.doi.org/10.3389/fmars.2023.1118645 https://www.frontiersin.org/articles/10.3389/fmars.2023.1118645/full |
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crfrontiers:10.3389/fmars.2023.1118645 2024-02-11T10:01:57+01:00 Testing of a helix twine off-bottom trawl on Georges Bank Chosid, David M. Pol, Michael 2023 http://dx.doi.org/10.3389/fmars.2023.1118645 https://www.frontiersin.org/articles/10.3389/fmars.2023.1118645/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 10 ISSN 2296-7745 Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography journal-article 2023 crfrontiers https://doi.org/10.3389/fmars.2023.1118645 2024-01-26T10:06:33Z The massive biomass of Eastern Georges Bank haddock ( Melanogrammus aeglefinus ) is difficult to harvest without capturing less robust, but still valuable groundfish stocks like Atlantic cod ( Gadus morhua ) and some flatfish species. Specialized haddock trawls that raise the mouth of the nets off-bottom have reduced bycatch but the very poor status of Atlantic cod prioritizes even greater reduction to prevent exceeding regulatory fishing quotas. Raising the entire fishing gear off-bottom may further reduce bycatch while eliminating benthic impacts, expanding access to grounds previously off-limits to bottom-tending trawls. We evaluated an off-bottom trawl (OBT) to harvest Eastern Georges Bank haddock while reducing catches of overexploited stocks. The OBT net has very large meshes at the front end, made with innovative “helix” twine that produces lateral hydraulic forces while towing, resulting in self-spreading of the meshes. We established optimal gear configurations to achieve the target OBT net shape and distance to the seafloor by using an assortment of mensuration sensors/loggers and cameras. The OBT caught similar amounts of haddock and reduced some bycatch more than a standard bottom “Ruhle trawl”, but also caught fish of the same lengths despite the OBT using a smaller mesh-sized codend. The OBT also demonstrated similar requirements in vessel RPMs as the Ruhle trawl, despite having a larger swept area. Article in Journal/Newspaper atlantic cod Gadus morhua Frontiers (Publisher) Frontiers in Marine Science 10 |
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Open Polar |
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Frontiers (Publisher) |
op_collection_id |
crfrontiers |
language |
unknown |
topic |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
spellingShingle |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography Chosid, David M. Pol, Michael Testing of a helix twine off-bottom trawl on Georges Bank |
topic_facet |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
description |
The massive biomass of Eastern Georges Bank haddock ( Melanogrammus aeglefinus ) is difficult to harvest without capturing less robust, but still valuable groundfish stocks like Atlantic cod ( Gadus morhua ) and some flatfish species. Specialized haddock trawls that raise the mouth of the nets off-bottom have reduced bycatch but the very poor status of Atlantic cod prioritizes even greater reduction to prevent exceeding regulatory fishing quotas. Raising the entire fishing gear off-bottom may further reduce bycatch while eliminating benthic impacts, expanding access to grounds previously off-limits to bottom-tending trawls. We evaluated an off-bottom trawl (OBT) to harvest Eastern Georges Bank haddock while reducing catches of overexploited stocks. The OBT net has very large meshes at the front end, made with innovative “helix” twine that produces lateral hydraulic forces while towing, resulting in self-spreading of the meshes. We established optimal gear configurations to achieve the target OBT net shape and distance to the seafloor by using an assortment of mensuration sensors/loggers and cameras. The OBT caught similar amounts of haddock and reduced some bycatch more than a standard bottom “Ruhle trawl”, but also caught fish of the same lengths despite the OBT using a smaller mesh-sized codend. The OBT also demonstrated similar requirements in vessel RPMs as the Ruhle trawl, despite having a larger swept area. |
format |
Article in Journal/Newspaper |
author |
Chosid, David M. Pol, Michael |
author_facet |
Chosid, David M. Pol, Michael |
author_sort |
Chosid, David M. |
title |
Testing of a helix twine off-bottom trawl on Georges Bank |
title_short |
Testing of a helix twine off-bottom trawl on Georges Bank |
title_full |
Testing of a helix twine off-bottom trawl on Georges Bank |
title_fullStr |
Testing of a helix twine off-bottom trawl on Georges Bank |
title_full_unstemmed |
Testing of a helix twine off-bottom trawl on Georges Bank |
title_sort |
testing of a helix twine off-bottom trawl on georges bank |
publisher |
Frontiers Media SA |
publishDate |
2023 |
url |
http://dx.doi.org/10.3389/fmars.2023.1118645 https://www.frontiersin.org/articles/10.3389/fmars.2023.1118645/full |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Frontiers in Marine Science volume 10 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2023.1118645 |
container_title |
Frontiers in Marine Science |
container_volume |
10 |
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1790597844183285760 |