Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery
Fuel consumption and environmental concerns have led bottom trawlers fishing for cod (Gadus morhua) in the Barents Sea to use semi-pelagic doors. However, this change may affect fish herding and consequently the catch efficiency of the gear. In this study we compared the catch efficiency of two diff...
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SINTEF Fiskeri og havbruk
2014
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ftsintef:oai:sintef.brage.unit.no:11250/2456396 2023-05-15T14:30:31+02:00 Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery Sistiaga, Manu Berrondo Grimaldo, Eduardo Herrmann, Bent Larsen, Roger B. Tatone, Ivan 2014-07-01 application/pdf http://hdl.handle.net/11250/2456396 eng eng SINTEF Fiskeri og havbruk SINTEF Fiskeri og havbruk;A26220 urn:isbn:978-82-14-05730-0 http://hdl.handle.net/11250/2456396 cristin:1496856 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no SINTEF Ocean CC-BY-NC-ND 28 Catch efficiency Demersal trawl fishery Herding Sweeps Cod Catch comparison Catch ratio Research report 2014 ftsintef 2021-08-04T11:59:24Z Fuel consumption and environmental concerns have led bottom trawlers fishing for cod (Gadus morhua) in the Barents Sea to use semi-pelagic doors. However, this change may affect fish herding and consequently the catch efficiency of the gear. In this study we compared the catch efficiency of two different setups where the sweep length with bottom contact was different. This setup also enabled us to estimate the herding efficiency of the sweeps on the seabed. The data for this study were collected using the alternate haul method and analyzed using a new method for unpaired data. We estimated that the setup with the lifted sweeps captured on average 33% fewer cod than the setup that kept the sweeps at the seabed. The loss of catch for cod was length independent and significant for a length span between 41 and 104 cm. When sweeps were lifted above the seabed, herding was negatively impacted and fish were lost; in contrast, when on the seabed, the sweeps were able to herd (on average) 45% of the cod into the catch zone of the gear. Lifting the trawl doors from the seabed is touted as a positive development for this fishery. However, our results show that lifting the doors and consequently the sweeps can lead to substantial catch losses. Finally, the study highlights the importance of carefully evaluating the positive and negative potential consequences of introducing changes in a fishing gear. The Norwegian Research Council;The Norwegian Seafood Research fund (FHF);Rolls-Royce marine AS;Mørenot AS; publishedVersion Report Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod SINTEF Open (Brage) Arctic Barents Sea Royce ENVELOPE(-118.836,-118.836,56.217,56.217) |
institution |
Open Polar |
collection |
SINTEF Open (Brage) |
op_collection_id |
ftsintef |
language |
English |
topic |
Catch efficiency Demersal trawl fishery Herding Sweeps Cod Catch comparison Catch ratio |
spellingShingle |
Catch efficiency Demersal trawl fishery Herding Sweeps Cod Catch comparison Catch ratio Sistiaga, Manu Berrondo Grimaldo, Eduardo Herrmann, Bent Larsen, Roger B. Tatone, Ivan Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery |
topic_facet |
Catch efficiency Demersal trawl fishery Herding Sweeps Cod Catch comparison Catch ratio |
description |
Fuel consumption and environmental concerns have led bottom trawlers fishing for cod (Gadus morhua) in the Barents Sea to use semi-pelagic doors. However, this change may affect fish herding and consequently the catch efficiency of the gear. In this study we compared the catch efficiency of two different setups where the sweep length with bottom contact was different. This setup also enabled us to estimate the herding efficiency of the sweeps on the seabed. The data for this study were collected using the alternate haul method and analyzed using a new method for unpaired data. We estimated that the setup with the lifted sweeps captured on average 33% fewer cod than the setup that kept the sweeps at the seabed. The loss of catch for cod was length independent and significant for a length span between 41 and 104 cm. When sweeps were lifted above the seabed, herding was negatively impacted and fish were lost; in contrast, when on the seabed, the sweeps were able to herd (on average) 45% of the cod into the catch zone of the gear. Lifting the trawl doors from the seabed is touted as a positive development for this fishery. However, our results show that lifting the doors and consequently the sweeps can lead to substantial catch losses. Finally, the study highlights the importance of carefully evaluating the positive and negative potential consequences of introducing changes in a fishing gear. The Norwegian Research Council;The Norwegian Seafood Research fund (FHF);Rolls-Royce marine AS;Mørenot AS; publishedVersion |
format |
Report |
author |
Sistiaga, Manu Berrondo Grimaldo, Eduardo Herrmann, Bent Larsen, Roger B. Tatone, Ivan |
author_facet |
Sistiaga, Manu Berrondo Grimaldo, Eduardo Herrmann, Bent Larsen, Roger B. Tatone, Ivan |
author_sort |
Sistiaga, Manu Berrondo |
title |
Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery |
title_short |
Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery |
title_full |
Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery |
title_fullStr |
Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery |
title_full_unstemmed |
Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery |
title_sort |
effect of lifting the sweeps on bottom trawling catch efficiency on the northeast arctic cod trawl fishery |
publisher |
SINTEF Fiskeri og havbruk |
publishDate |
2014 |
url |
http://hdl.handle.net/11250/2456396 |
long_lat |
ENVELOPE(-118.836,-118.836,56.217,56.217) |
geographic |
Arctic Barents Sea Royce |
geographic_facet |
Arctic Barents Sea Royce |
genre |
Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
op_source |
28 |
op_relation |
SINTEF Fiskeri og havbruk;A26220 urn:isbn:978-82-14-05730-0 http://hdl.handle.net/11250/2456396 cristin:1496856 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no SINTEF Ocean |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766304348543909888 |