Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation
Beam trawl fisheries for sole are characterised by large amounts of unwanted bycatch (i.e. discards) consisting of fish below the Minimum Conservation Reference Size, unwanted fish due to low commercial value or lack of quota, and benthic invertebrates. In order to reduce the quantity of discards, a...
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Online Access: | https://research.wur.nl/en/publications/changes-in-catch-efficiency-and-selectivity-in-the-beam-trawl-fis https://doi.org/10.1016/j.fishres.2022.106603 |
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ftunivwagenin:oai:library.wur.nl:wurpubs/607644 2024-04-28T08:19:35+00:00 Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation van Overzee, Harriët M.J. Rijnsdorp, Adriaan D. Poos, Jan Jaap 2023 application/pdf https://research.wur.nl/en/publications/changes-in-catch-efficiency-and-selectivity-in-the-beam-trawl-fis https://doi.org/10.1016/j.fishres.2022.106603 en eng https://edepot.wur.nl/584537 https://research.wur.nl/en/publications/changes-in-catch-efficiency-and-selectivity-in-the-beam-trawl-fis doi:10.1016/j.fishres.2022.106603 https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research Fisheries Research 260 (2023) ISSN: 0165-7836 Bottom trawling Discards Fisheries management North Sea Pulse trawling Article/Letter to editor 2023 ftunivwagenin https://doi.org/10.1016/j.fishres.2022.106603 2024-04-03T14:44:43Z Beam trawl fisheries for sole are characterised by large amounts of unwanted bycatch (i.e. discards) consisting of fish below the Minimum Conservation Reference Size, unwanted fish due to low commercial value or lack of quota, and benthic invertebrates. In order to reduce the quantity of discards, a substantial part of the Dutch beam trawl fleet was allowed to replace the conventional tickler chain beam trawl (BT) with the pulse trawl (PT) on an experimental basis. The PT used electrical stimulation to immobilise and capture fish. Here we study whether pulse trawling reduced the amount of discards by comparing catch rates of landings and discards of BT and PT in the period 2009–2018 for a wide range of species. The PT caught (kg.km-2) significantly more marketable sized sole (Solea solea, 48 %), turbot (Psetta maxima, 8 %), brill (Scophthalmus rhombus, 28 %) and whiting (Merlangius merlangus, 95 %), and significantly less marketable sized plaice (Pleuronectes platessa, −16 %), cod (Gadus morhua, −32 %) and gurnards (−12 %). No significant difference was found for dab (Limanda limanda), gadoids, or rays and sharks. Among discards, the PT caught more undersized sole (27 %) and whiting (42 %) but less undersized plaice (−21 %), dab (−19 %) and grey gurnard (Eutrigla gurnardus, −31 %). The observed differences in species selectivity are discussed in relation to the response of fish to bottom trawl gear and the effects of pulse stimulation. For the benthic invertebrates Ophiuroidae, bivalves and crabs the PT caught fewer individuals (between −38 % and −57 %). No significant difference was observed in sea urchins and sea stars. Overall, this study shows that the transition from the BT to PT resulted in a 36 % decrease (95 % prediction interval: 31–42 %) in discards (kg.hour-1). Article in Journal/Newspaper Gadus morhua Turbot Wageningen UR (University & Research Centre): Digital Library Fisheries Research 260 106603 |
institution |
Open Polar |
collection |
Wageningen UR (University & Research Centre): Digital Library |
op_collection_id |
ftunivwagenin |
language |
English |
topic |
Bottom trawling Discards Fisheries management North Sea Pulse trawling |
spellingShingle |
Bottom trawling Discards Fisheries management North Sea Pulse trawling van Overzee, Harriët M.J. Rijnsdorp, Adriaan D. Poos, Jan Jaap Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation |
topic_facet |
Bottom trawling Discards Fisheries management North Sea Pulse trawling |
description |
Beam trawl fisheries for sole are characterised by large amounts of unwanted bycatch (i.e. discards) consisting of fish below the Minimum Conservation Reference Size, unwanted fish due to low commercial value or lack of quota, and benthic invertebrates. In order to reduce the quantity of discards, a substantial part of the Dutch beam trawl fleet was allowed to replace the conventional tickler chain beam trawl (BT) with the pulse trawl (PT) on an experimental basis. The PT used electrical stimulation to immobilise and capture fish. Here we study whether pulse trawling reduced the amount of discards by comparing catch rates of landings and discards of BT and PT in the period 2009–2018 for a wide range of species. The PT caught (kg.km-2) significantly more marketable sized sole (Solea solea, 48 %), turbot (Psetta maxima, 8 %), brill (Scophthalmus rhombus, 28 %) and whiting (Merlangius merlangus, 95 %), and significantly less marketable sized plaice (Pleuronectes platessa, −16 %), cod (Gadus morhua, −32 %) and gurnards (−12 %). No significant difference was found for dab (Limanda limanda), gadoids, or rays and sharks. Among discards, the PT caught more undersized sole (27 %) and whiting (42 %) but less undersized plaice (−21 %), dab (−19 %) and grey gurnard (Eutrigla gurnardus, −31 %). The observed differences in species selectivity are discussed in relation to the response of fish to bottom trawl gear and the effects of pulse stimulation. For the benthic invertebrates Ophiuroidae, bivalves and crabs the PT caught fewer individuals (between −38 % and −57 %). No significant difference was observed in sea urchins and sea stars. Overall, this study shows that the transition from the BT to PT resulted in a 36 % decrease (95 % prediction interval: 31–42 %) in discards (kg.hour-1). |
format |
Article in Journal/Newspaper |
author |
van Overzee, Harriët M.J. Rijnsdorp, Adriaan D. Poos, Jan Jaap |
author_facet |
van Overzee, Harriët M.J. Rijnsdorp, Adriaan D. Poos, Jan Jaap |
author_sort |
van Overzee, Harriët M.J. |
title |
Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation |
title_short |
Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation |
title_full |
Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation |
title_fullStr |
Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation |
title_full_unstemmed |
Changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation |
title_sort |
changes in catch efficiency and selectivity in the beam trawl fishery for sole when mechanical stimulation is replaced by electrical stimulation |
publishDate |
2023 |
url |
https://research.wur.nl/en/publications/changes-in-catch-efficiency-and-selectivity-in-the-beam-trawl-fis https://doi.org/10.1016/j.fishres.2022.106603 |
genre |
Gadus morhua Turbot |
genre_facet |
Gadus morhua Turbot |
op_source |
Fisheries Research 260 (2023) ISSN: 0165-7836 |
op_relation |
https://edepot.wur.nl/584537 https://research.wur.nl/en/publications/changes-in-catch-efficiency-and-selectivity-in-the-beam-trawl-fis doi:10.1016/j.fishres.2022.106603 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research |
op_doi |
https://doi.org/10.1016/j.fishres.2022.106603 |
container_title |
Fisheries Research |
container_volume |
260 |
container_start_page |
106603 |
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1797583011996237824 |