Analyse der Beifangreduktion durch Gitternetze in der kommerziellen Garnelenfischerei

Wienbeck, Harald (1999) Analyse der Beifangreduktion durch Gitternetze in der kommerziellen Garnelenfischerei. Informationen für die Fischwirtschaft aus der Fischereiforschung, 46(1), pp. 33-35.

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Official URL: http://aquacomm.fcla.edu/3276

Abstract

Trials for the determination of the magnitude of bycatch reduction by sorting grids used in the commercial brown shrimp fishery were carried out from September to December 1997. Trawls with 9 m beam length were used on different fishing grounds in the estuary of the Elbe River near Cuxhaven. The sorting grids tested were made of stainless steel bars spaced at 18, 20, 22, 26 and 30 mm, built into a cylindrical stainless steel frame with a diameter of 65 cm at an angle of attack of 45 degrees. This frame was positioned between the forenet and codend. Simultaneous hauls were made with a trawl of equal construction but without a sorting grid, and the weighed catch components (fish, discard shrimps and commercial size shrimps) separated by means of a riddle were compared. The composition of the sorted out part of the catch of the sorting grid net could be calculated by comparise the corresponding catch components in both the standard trawl and the sorting grid trawl. According to this the total catch of the beam trawl with the sorting grid is reduced by 18 to 38 % depending on the space between the bars. 7 to 31 % of the sorted out part of the catch consists of fish. The use of the sorting grid, however, also leads to losses of 4 to 12 % in Oktober. Per hour of towing this means a loss of 10,3 % commerical size shrimps with a sorting grid of 18 mm space between the bars and of 12,4 % for a 26 mm grid.

Item Type: Article
Title: Analyse der Beifangreduktion durch Gitternetze in der kommerziellen Garnelenfischerei
Personal Creator/Author:
CreatorsEmail
Wienbeck, Haraldharald.wienbeck@vti.bund.de
Refereed: No
Journal or Publication Title: Informationen für die Fischwirtschaft aus der Fischereiforschung
Volume: 46
Number: 1
Page Range: pp. 33-35
Date: 1999
ISSN: 1437-5842
Contact Email Address: harald.wienbeck@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: net selection; sustainable fisheries; fishing technique; net construction; shrimp fisheries
Subjects: Fisheries
Engineering
Item ID: 3276
Depositing User: Horst Bahl
Date Deposited: 07 May 2010 16:53
Last Modified: 10 Nov 2012 17:49
Related URLs:
URI: http://aquaticcommons.org/id/eprint/3276

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