Wer fischt was? – Gemischte Bodenfischereien und ihre Auswirkungen auf die wichtigsten Nutzfischbestände in der Nordsee

Rätz, Hans-Joachim and Ehrich, Siegfried and Bethke, Eckhard (2005) Wer fischt was? – Gemischte Bodenfischereien und ihre Auswirkungen auf die wichtigsten Nutzfischbestände in der Nordsee. Informationen aus der Fischereiforschung = Information on Fishery Research, 52(1), pp. 91-100. DOI: 10.3220/Infn52_91-100_2005

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Official URL: http://aquacomm.fcla.edu/3072

Abstract

Cod, haddock, whiting, saithe, plaice, sole and Norway lobster are 7 main target species of the demersal mixed fisheries in the North Sea, Skagerrak and Eastern Channel. Gadoids and Norway lobsters are mainly taken in the nor-thern North Sea by towed gears except beam trawls while the flatfish fisheries are conducted in the southern North Sea mainly using beam trawls. Recently, the central North Sea appears less fished by demersal gears. Towed nets including seines and beam trawls equipped with meshes of more than 100 mm resp. more than 80 mm were identified as the main gears effecting the depleted cod and reduced plaice stocks. The saithe sector, using towed nets with meshes of more than110 mm, longlines, gill nets and others, appears to affect the 7 species to a lesser extend. These results support the interim effort limitations by gear types, vessel and month as enforced by the European Commission since 2003. TAC regulations alone are considered inefficient to sustainably harvest stocks by mixed fisheries. A fleet-effort management method is developed estimating the fleets’ effects based on the sum of partial exploitation rates of the species in mixed fisheries weighted by the ratio of the precautionary reference Bpa and the actual SSB size as ecological quality objective. Applying such fleet effort management could result in increased catch possibilities of some stocks by fleets selecting mainly few and non-overexploited stocks while respecting precautionary management constraints in minimum SSB or maximum exploitation rates at the same time.

Item Type: Article
Title: Wer fischt was? – Gemischte Bodenfischereien und ihre Auswirkungen auf die wichtigsten Nutzfischbestände in der Nordsee
Personal Creator/Author:
CreatorsEmail
Rätz, Hans-Joachimhans-joachim.raetz@vti.bund.de
Ehrich, Siegfriedsiegfried.ehrich@online.de
Bethke, Eckhardeckhard.bethke@vti.bund.de
Refereed: No
Journal or Publication Title: Informationen aus der Fischereiforschung = Information on Fishery Research
Volume: 52
Number: 1
Page Range: pp. 91-100
Date: 2005
ISSN: 1861-2164
Contact Email Address: hans-joachim.raetz@vti.bund.de
Issuing Agency: Bundesforschungsanstalt für 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 on Fishery Research in 2010.
Uncontrolled Keywords: Fishery management; spawning stock; discards; geographical distribution; TAC; sustainable fisheries
Subjects: Management
Fisheries
Item ID: 3072
Depositing User: Horst Bahl
Date Deposited: 14 Apr 2010 14:01
Last Modified: 29 Sep 2011 17:54
Related URLs:
URI: http://aquaticcommons.org/id/eprint/3072

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