Model research on a single-door trawl at lake Insko in 1990
de Jong, H.; van Marlen, B. (1991). Model research on a single-door trawl at lake Insko in 1990. CM Documents - ICES, C.M. 1991(B:21). International Council for the Exploration of the Sea: Copenhagen. 11 + tables + figures pp.
Part of: ICES CM Documents - ICES. ICES: Copenhagen. ISSN 1015-4744
Experiments on a 1 to 7 scale trawl model of a net of type "FANNY II", rigged with one door at the port side and a Dan-leno at the starboard side are described in this paper. The aim of this rigging is to catch fish in close proximity of the sea surface outside the wake of the trawler thus making use of avoidance reactions of fish to emitted sound in the path of the vessel. The trials were conducted at station Insko, Poland in cooperation with the University of Agriculture, Szczecin and the University and "Institut fuer Hochseefischerei und Fischverarbeitung - (IfH)" of Rostock, Germany in June 1990. The geometry and resistance of the trawl model were measured and recorded with variable components of the rigging and the results are explained. A variant with two doors spreading in the same direction has also been tried with success. It is recommended to prove the concept of this rigging prior to further technical optimization. The rigging may become appropriate for a sampling gear for pelagic fish close to the surface.
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