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 AS
2014
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ftunivtroemsoe:oai:munin.uit.no:10037/11676 2023-05-15T14:25:05+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 https://hdl.handle.net/10037/11676 eng eng Sintef fiskeri og havbruk AS Sistiaga MB, Grimaldo E, Herrmann B, Larsen RBL, Tatone I. Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery. SINTEF Fiskeri og havbruk; 2014. 28 p. FRIDAID 1496856 978-82-14-05730-0 https://hdl.handle.net/10037/11676 openAccess VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Research report Forskningsrapport 2014 ftunivtroemsoe 2021-06-25T17:55:24Z 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. Report Arctic Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod University of Tromsø: Munin Open Research Archive Arctic Barents Sea |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 |
spellingShingle |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 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 |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 |
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. |
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 AS |
publishDate |
2014 |
url |
https://hdl.handle.net/10037/11676 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
op_relation |
Sistiaga MB, Grimaldo E, Herrmann B, Larsen RBL, Tatone I. Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery. SINTEF Fiskeri og havbruk; 2014. 28 p. FRIDAID 1496856 978-82-14-05730-0 https://hdl.handle.net/10037/11676 |
op_rights |
openAccess |
_version_ |
1766297521083121664 |