Auswirkungen von größeren Steertmaschen bei Grundschleppnetzen auf Plattfischfänge in der Nordsee

Wienbeck, Harald and Panten, Kay (2008) Auswirkungen von größeren Steertmaschen bei Grundschleppnetzen auf Plattfischfänge in der Nordsee. Informationen aus der Fischereiforschung = Information on Fishery Research, 55(1), pp. 15-20. DOI: 10.3220/Infn55_15-20_2008

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Official URL: http://aquacomm.fcla.edu/2942/

Abstract

The present fishing effort regulation for bottom trawls in the North Sea (EU 40/2008) reduces the fishing effort with larger co-dend mesh sizes (> 100 mm mesh opening) to 86 fishing days per year. The aim of this technical measure is the protection of the weak cod stock usually harvested with this mesh opening. By combining the results of our selectivity investigations on plaice during a commercial fishing trip and the samples taken within the frame of the EU data collection regulation (DCR) we could draw conclusions on commercial and non-commercial fish species. When using codend meshes with larger mesh opening the discard was reduced remarkably. In the reference codend with 80 mm mesh opening the undersized bycatch was 47 % of the total catch of plaice, in the experimental codends with 120 mm mesh opening it was only 7 % and with 130 mm mesh opening just 3 %. On the other hand however, the applied mesh openings in the experimental codends let escape marketable plaice to some extent. The loss of catch was assessed on the basis of fish numbers per length class using a length-weight conversion rate from the DCR. The loss by weight of marketable fish with 120 mm codend mesh opening was 18 %, and 28 % with 130 mm codend mesh opening. To assure the protection of young round and flatfish with one general mesh size, a new regulation should prescribe a minimum mesh opening of 120 mm, accompanied by an expansion of the fishing effort.

Item Type: Article
Title: Auswirkungen von größeren Steertmaschen bei Grundschleppnetzen auf Plattfischfänge in der Nordsee
Personal Creator/Author:
CreatorsEmail
Wienbeck, Haraldharald.wienbeck@vti.bund.de
Panten, Kaykay.panten@vti.bund.de
Refereed: No
Journal or Publication Title: Informationen aus der Fischereiforschung = Information on Fishery Research
Volume: 55
Number: 1
Page Range: pp. 15-20
Date: 2008
ISSN: 1861-2164
Contact Email Address: harald.wienbeck@vti.bund.de
Issuing Agency: Johann Heinrich von Thünen-Institut, Bundesforschungsinstitut für Ländliche Räume, Wald und Fischerei
Additional Information: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung - Information in Fishery Research in 2010.
Uncontrolled Keywords: Fangtechnik; Maschenselektion; Discards
Subjects: Conservation
Management
Fisheries
Item ID: 2942
Depositing User: Horst Bahl
Date Deposited: 04 Mar 2010 12:32
Last Modified: 29 Sep 2011 18:13
URI: http://aquaticcommons.org/id/eprint/2942

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