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a stainless steel collar with three hooks for easy opening and emptying of
the caught animals. The traps were set at 100, 50, 30, 20, 10 and 5 m
above the bottom, and one trap was mounted immediately above the
bottom weight. For ballast-weight release, two tandem transponders were
arranged in a metal frame support and connected with a chain looped
through the release weight. To observe what species were attracted to the
bait, dead fish were mounted in front of the FBOS camera system. In some
cases, the bait was placed in a transparent trap made from a multiple-corer
tube to learn about the behaviour of species at the traps and to test
whether all species were captured equally well.
1.5.2. Macrofauna
For quantitative sampling of macrofauna, an USNEL box corer
(figure 4) was used. The sampling area was 50 by 50 cm and several
modifications were made. During the last cruise, the box corer was
equipped with an online video system that allowed exact sampling of
disturbed areas within the DEA.
Figure 4 The USNEL box corer.
336 INTERNATIONAL SEABED AUTHORITY