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Article: The effect of autotrawl systems on the performance of a survey trawl.
- Article from:
- Fishery Bulletin
- Article date:
- January 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 National Marine Fisheries Service. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Abstract--Three aspects of a survey bottom trawl performance--1) trawl geometry (i.e., net spread, door spread, and headrope height); 2) footrope distance off-bottom; and 3) bridle distance off-bottom--were compared among hauls by using either of two autotrawl systems (equal tension and net symmetry) and hauls conducted with towing cables of equal length and locked winches. The effects of environmental conditions, vessel heave, crabbing (i.e., the difference between vessel heading and actual vessel course over ground), and bottom current on trawl performance with three trawling modes were investigated. Means and standard deviations of trawl geometry measures were not ...