Traapüük
steel tube and supported on each side by rugged
steel trawlheads (d) which slide over the sea
bottom. Ahead of each groundrope several tons of
tickler chains (e) or chain mats (f) are used to
disturb fish, causing them to rise up and be taken
by the trawl following immediately behind. Towing
speeds are generally higher than otter trawling,
reaching 6 or 7 knots on clean ground with ticklers,
whereas on rough ground stone mats are towed at
around 4 knots. Beamers usually operate on the
continental shelf (200 m) with warp length/water
depth ratios of between 2.5:1 to 3:1. Some larger
vessels use a double wire system (z) to facilitate
the hauling procedure.
14
Beamtraal
15
EQUIPMENT ON A TRAWLER DESIGNED FOR STERN TRAWLING
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