Horizontale Trennblätter in Trawls zur Verringerung von Discards in der Ostsee

Mieske, Bernd (2004) Horizontale Trennblätter in Trawls zur Verringerung von Discards in der Ostsee. Informationen für die Fischwirtschaft aus der Fischereiforschung, 51(1), pp. 11-17.

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Official URL: http://aquacomm.fcla.edu/3078

Abstract

A primary objective of the Common Fishery Policy of the European Union is the reduction of discards and unwanted by-catches in the fishery. In principle this could be achieved if the catching methods were optimised for this. Still high numbers of undersized flatfish are caught in the bottom trawls. Although EU regulations make the use of the BACOMA codend mandatory in the Baltic Sea cod areable to escape through square mesh escape window of the BACOMA net the whereas flatfish still remain in the cod-end. Gear experiments have been carried out with the aim to better separate cod from the flatfish fraction already when entering the rear belly, making use of the natural behaviour of the fish, i. e. the preferred swimming distance from the bottom of the net in the funnel. As cod have a natural tendency to keep a relativly great distance from the bottom, flatfish tend to stay close to it. It was attempted to separate both fractions by splitting the funnel into an upper and lower part with a horizontal panel. This wastested for two different nets, a cod trawl to separate cod from flatfish, and an eel-trawl to separate cod and flatfish from eel. Cod and flatfish separation is best at a panel distance of 50 cm from the bottom. Thus, 74 % of the cod were found in the upper panel, whereas 75 % of the flounder were in the lower section. A separation of eel from cod was however not possible, since eel tend to rise to the upper part of the net, together with cod.

Item Type: Article
Title: Horizontale Trennblätter in Trawls zur Verringerung von Discards in der Ostsee
Personal Creator/Author:
CreatorsEmail
Mieske, Berndbernd.mieske@vti.bund.de
Refereed: No
Journal or Publication Title: Informationen für die Fischwirtschaft aus der Fischereiforschung
Volume: 51
Number: 1
Page Range: pp. 11-17
Date: 2004
ISSN: 1437-5842
Contact Email Address: bernd.mieske@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: fishing technique; drag net
Subjects: Fisheries
Item ID: 3078
Depositing User: Horst Bahl
Date Deposited: 14 Apr 2010 13:57
Last Modified: 25 Apr 2012 23:08
URI: http://aquaticcommons.org/id/eprint/3078

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