Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation
Source at https://doi.org/10.1080/19425120.2017.1360421 . Accepted manuscript version, licensed CC BY-NC-ND 4.0 The introduction of the Nordmøre grid to shrimp trawls has reduced the issue of bycatch to that of small-sized species and juveniles that are able to pass through the grid and enter the sm...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Taylor & Francis Open
2017
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Online Access: | https://hdl.handle.net/10037/13120 https://doi.org/10.1080/19425120.2017.1360421 |
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ftunivtroemsoe:oai:munin.uit.no:10037/13120 2023-05-15T15:27:51+02:00 Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Brinkhof, Jesse Tatone, Ivan Langård, Lise 2017-07-31 https://hdl.handle.net/10037/13120 https://doi.org/10.1080/19425120.2017.1360421 eng eng Taylor & Francis Open Marine and Coastal Fisheries Larsen, R.B., Herrmann, B., Sistiaga, M., Brinkhof, J., Tatone, I. & Langård, L. (2017). Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation. Marine and Coastal Fisheries, 9(1), 479-492. https://doi.org/10.1080/19425120.2017.1360421 FRIDAID 1555991 doi:10.1080/19425120.2017.1360421 1942-5120 https://hdl.handle.net/10037/13120 openAccess VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.1080/19425120.2017.1360421 2021-06-25T17:55:46Z Source at https://doi.org/10.1080/19425120.2017.1360421 . Accepted manuscript version, licensed CC BY-NC-ND 4.0 The introduction of the Nordmøre grid to shrimp trawls has reduced the issue of bycatch to that of small-sized species and juveniles that are able to pass through the grid and enter the small-meshed cod end together with the targeted shrimp. This study estimated the size- and species-selective performance of the Nordmøre grid in the configuration most often applied by fishermen and made a preliminary exploration of the effects of reducing the length of the guiding funnel in front of the grid and mounting light-emitting diodes (LEDs) around the escape exit. Experimental fishing trials were conducted in the Barents Sea to assess the size-selective properties of a 19-mm bar spacing Nordmøre grid, mandatory in this Norwegian trawl fishery targeting deepwater shrimp Pandalus borealis (also known as northern shrimp), and its potential improvement. Results were obtained for the target species and four bycatch species: redfish Sebastes spp., Haddock Melanogrammus aeglefinus, Atlantic Cod Gadus morhua, and American Plaice Hippoglossoides platessoides. In general, very few deepwater shrimp were found to escape through the escape exit, although the quantity increased slightly at larger sizes. Between 80% and 100% of the bycatch species up to a species-specific size passed through the grid and entered the cod end. A short guiding funnel decreased this for Haddock significantly by increasing the fraction of small Haddock seeking the escape exit. Further, adding LEDs around the escape exit significantly negated this effect. For the other bycatch species, the results indicated similar trends but were not statistically significant. However, considering that only a few fishing hauls were conducted using the short guiding funnel with or without mounting LEDs calls for some caution when attributing these changes to the configuration of the Nordmøre grid, and these preliminary results should be followed up by further testing before definitive conclusions are made. Article in Journal/Newspaper atlantic cod Barents Sea Gadus morhua northern shrimp Pandalus borealis University of Tromsø: Munin Open Research Archive Barents Sea Nordmøre ENVELOPE(8.500,8.500,63.000,63.000) Marine and Coastal Fisheries 9 1 479 492 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 |
spellingShingle |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Brinkhof, Jesse Tatone, Ivan Langård, Lise Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation |
topic_facet |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 |
description |
Source at https://doi.org/10.1080/19425120.2017.1360421 . Accepted manuscript version, licensed CC BY-NC-ND 4.0 The introduction of the Nordmøre grid to shrimp trawls has reduced the issue of bycatch to that of small-sized species and juveniles that are able to pass through the grid and enter the small-meshed cod end together with the targeted shrimp. This study estimated the size- and species-selective performance of the Nordmøre grid in the configuration most often applied by fishermen and made a preliminary exploration of the effects of reducing the length of the guiding funnel in front of the grid and mounting light-emitting diodes (LEDs) around the escape exit. Experimental fishing trials were conducted in the Barents Sea to assess the size-selective properties of a 19-mm bar spacing Nordmøre grid, mandatory in this Norwegian trawl fishery targeting deepwater shrimp Pandalus borealis (also known as northern shrimp), and its potential improvement. Results were obtained for the target species and four bycatch species: redfish Sebastes spp., Haddock Melanogrammus aeglefinus, Atlantic Cod Gadus morhua, and American Plaice Hippoglossoides platessoides. In general, very few deepwater shrimp were found to escape through the escape exit, although the quantity increased slightly at larger sizes. Between 80% and 100% of the bycatch species up to a species-specific size passed through the grid and entered the cod end. A short guiding funnel decreased this for Haddock significantly by increasing the fraction of small Haddock seeking the escape exit. Further, adding LEDs around the escape exit significantly negated this effect. For the other bycatch species, the results indicated similar trends but were not statistically significant. However, considering that only a few fishing hauls were conducted using the short guiding funnel with or without mounting LEDs calls for some caution when attributing these changes to the configuration of the Nordmøre grid, and these preliminary results should be followed up by further testing before definitive conclusions are made. |
format |
Article in Journal/Newspaper |
author |
Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Brinkhof, Jesse Tatone, Ivan Langård, Lise |
author_facet |
Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Brinkhof, Jesse Tatone, Ivan Langård, Lise |
author_sort |
Larsen, Roger B. |
title |
Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation |
title_short |
Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation |
title_full |
Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation |
title_fullStr |
Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation |
title_full_unstemmed |
Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation |
title_sort |
performance of the nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation |
publisher |
Taylor & Francis Open |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/13120 https://doi.org/10.1080/19425120.2017.1360421 |
long_lat |
ENVELOPE(8.500,8.500,63.000,63.000) |
geographic |
Barents Sea Nordmøre |
geographic_facet |
Barents Sea Nordmøre |
genre |
atlantic cod Barents Sea Gadus morhua northern shrimp Pandalus borealis |
genre_facet |
atlantic cod Barents Sea Gadus morhua northern shrimp Pandalus borealis |
op_relation |
Marine and Coastal Fisheries Larsen, R.B., Herrmann, B., Sistiaga, M., Brinkhof, J., Tatone, I. & Langård, L. (2017). Performance of the Nordmøre grid in shrimp trawling and potential effects of guiding funnel length and light stimulation. Marine and Coastal Fisheries, 9(1), 479-492. https://doi.org/10.1080/19425120.2017.1360421 FRIDAID 1555991 doi:10.1080/19425120.2017.1360421 1942-5120 https://hdl.handle.net/10037/13120 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1080/19425120.2017.1360421 |
container_title |
Marine and Coastal Fisheries |
container_volume |
9 |
container_issue |
1 |
container_start_page |
479 |
op_container_end_page |
492 |
_version_ |
1766358252086362112 |