Simulierte Auswirkungen des mehrjährigen Bewirtschaftungsplans für die Dorschfischerei in der westlichen Ostsee und die Möglichkeit einer technischen Alternative

Rätz, Hans-Joachim and Bethke, Eckhard and Hölker, Franz and Gröhsler, Tomas (2008) Simulierte Auswirkungen des mehrjährigen Bewirtschaftungsplans für die Dorschfischerei in der westlichen Ostsee und die Möglichkeit einer technischen Alternative. Informationen aus der Fischereiforschung = Information on Fishery Research, 55(1), pp. 36-44. DOI: 10.3220/Infn55_36-44_2008

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Official URL: http://aquacomm.fcla.edu/2946/

Abstract

The cod stock in the Western Baltic Sea is assessed to be overfished regarding the definitions of the UN World Summit on Sustainable Development at Johannesburg in 2002. Thus, the European Fisheries Council enforced a multi-annual management plan in 2007. Our medium term simulations over the future 10 years assume similar stock productivity as compared with the past four decades and indicate that the goals of the management plan can be achieved through TAC and consistent effort regulations. Taking account of the uncertainty in the recruitment patterns, the target average fishing mortality of age groups 3 – 6 years of F = 0.6 per year as defined in the management plan is indicated to exceed sustainable levels consistent with high long term yields and low risk of depletion. The stipulated constraint of the annual TAC variations of ±15% will dominate future fisheries management and implies a high recovery potential of the stock through continued reductions in fishing mortality. The scientific assessment of sustainable levels of exploitation and consideration in the plan is strongly advised, taking account of uncertainties attributed to environmental and biological effects. We recommend our study to be complemented with economic impact assessments including effects on by-catch species, which have been disregarded in this study. It is further demonstrated, that the goals of the management plan can alternatively be achieved by mesh size adaptations. An alternative technical option of mesh size increases to realize the required reductions in fishing mortality provides avoidance of discards of undersized fish after a few years by means of improved selectivity, another important element of the Common Fisheries Policy. However, it is emphasized that technical regulations since 1990 failed to affect the by-catch and discards of juvenile cod. In any way, the meaningful implementation of the multiannual management plan through stringent control and enforcement appears critical.

Item Type: Article
Title: Simulierte Auswirkungen des mehrjährigen Bewirtschaftungsplans für die Dorschfischerei in der westlichen Ostsee und die Möglichkeit einer technischen Alternative
Personal Creator/Author:
CreatorsEmail
Rätz, Hans-Joachimhans-joachim.raetz@vti.bund.de
Bethke, Eckhardeckhard.bethke@vti.bund.de
Hölker, Franz
Gröhsler, Tomastomas.groehsler@vti.bund.de
Refereed: No
Journal or Publication Title: Informationen aus der Fischereiforschung = Information on Fishery Research
Volume: 55
Number: 1
Page Range: pp. 36-44
Date: 2008
ISSN: 1861-2164
Contact Email Address: hans-joachim.raetz@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 Fishery research in 2010. European Commission, Joint Research Centre, Institute for Protection and Security of the Citizen, Maritime Affairs Unit G.04; Johann Heinrich von Thünen-Institut, Institut für Seefischerei; Johann Heinrich von Thünen-Institut, Institut für Ostseefischerei
Uncontrolled Keywords: stock management; Baltic Sea; Cod; Dorsch; Bestandsmanagement;
Subjects: Management
Conservation
Fisheries
Item ID: 2946
Depositing User: Horst Bahl
Date Deposited: 04 Mar 2010 12:40
Last Modified: 29 Sep 2011 18:09
Related URLs:
URI: http://aquaticcommons.org/id/eprint/2946

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