The work was done over eight days during January 2014 in LakeWooloweyah (sandy and mud substrata in ∼1–2 m depth) using alocal penaeid trawler (10 m with an 89-kw engine) rigged with twohydraulic winches spooled with 8-mm diameter (ø) stainless warpsand 12-m bridles (6-mm Ø stainless wire) (Fig. 1). The trawler wasalso equipped with a: global positioning system (GPS; Lowrance);two hull-mounted sum logs (EchoPilot, Bronze Log+); and twoabove-water (Amalgamated Instrument Company–AIC; model noPA6139) and two underwater load cells (Delphi Measurement PtyLtd) with associated data loggers. The above-water load cells werebolted to each side of the vessel and clamped onto the bridles tomeasure their tension (kgf). The underwater load cells were config-ured so that they could be attached to the ground gears of the testedtrawls, with 30 m signal-cables extending forward to the vessel (seebelow).