100
N . A . HOLME
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Trigger plate
Dare
FIQ. 11. Aberdmti grab (from Smith and MrIntyre, 19,54), in uiiloadrd pomtion. This in
the psitton after the powerful springs ha\.@ pushed the buckets clown into the nand,
but before an upward pull on the douiiig wire hm completed the dosing of the
buckets. Area sampled: 0.1 in*. Weight 45 kg. (Reproduced by permission of
the Council of the Marine Biological Association of the United Kirigdom.)
any of the more active aiiiiiials which live in close association with the
bottom, but for various reasons only a few workers (e.g. Steven, 1930;
Jones, 1951 ; Longhurst, 1058) have supplemeiited their collecting by
using a trawl.
The large commercial otter traM Is are not particularly effective
for catching the smaller animals associated with the bottom fauna,
and one of the more useful instrumrnts which may be used is the
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